Boeing 737 MAX groundings explained

Image Upright:	1
Cause:	2019-2021 grounding: Airworthiness revoked after second fatal accident caused by flight control failure 2024 grounding: Uncontrolled decompression of exit door plug failure
Deaths:	346 total: 189 on Lion Air Flight 610 157 on Ethiopian Airlines Flight 302
Date:	Lion Air accident: October 29, 2018 Ethiopian Airlines accident: March 10, 2019 First grounding: by Ethiopian Airlines (superseded) First grounding order: by the Civil Aviation Administration of China (CAAC) – FAA grounding order – Alaska Airlines accident: January 5, 2024 FAA EAD grounding of Boeing 737 MAX 9 with door plug installed: January 6, 2024
Duration:	between accidents: of grounding by the FAA: (days) 2024 737 MAX 9 grounding: (days)
Budget:	direct costs: US$20billion indirect costs: US$60billion^[1]

The Boeing 737 MAX passenger airliner was grounded worldwide between March 2019 and December 2020longer in many jurisdictionsafter 346 people died in two similar crashes in less than five months: Lion Air Flight 610 on October 29, 2018, and Ethiopian Airlines Flight 302 on March 10, 2019. The Federal Aviation Administration initially affirmed the MAX's continued airworthiness, claiming to have insufficient evidence of accident similarities.^[2] By March 13, the FAA followed behind 51 concerned regulators in deciding to ground the aircraft.^[3] All 387 aircraft delivered to airlines were grounded by March 18.

In 2016, the FAA approved Boeing's request to remove references to a new Maneuvering Characteristics Augmentation System (MCAS) from the flight manual. In November 2018, after the Lion Air accident, Boeing instructed pilots to take corrective action in case of a malfunction in which the airplane entered a series of automated nosedives. Boeing avoided revealing the existence of MCAS until pilots requested further explanation. In December 2018, the FAA privately predicted that MCAS could cause 15 crashes over 30 years. In April 2019, the Ethiopian preliminary report stated that the crew had attempted the recommended recovery procedure, and Boeing confirmed that MCAS had activated in both accidents.^[4]

FAA certification of the MAX was subsequently investigated by the U.S. Congress and multiple U.S. government agencies, including the Transportation Department, FBI, NTSB, Inspector General and special panels. Engineering reviews uncovered other design problems, unrelated to MCAS, in the flight computers and cockpit displays. The Indonesian NTSC and the Ethiopian ECAA both attributed the crashes to faulty aircraft design and other factors, including maintenance and flight crew actions. Lawmakers investigated Boeing's incentives to minimize training for the new aircraft.^[5] The FAA revoked Boeing's authority to issue airworthiness certificates for individual MAX airplanes and fined Boeing for exerting "undue pressure" on its designated aircraft inspectors.

In August 2020, the FAA published requirements for fixing each aircraft and improving pilot training. On November 18, 2020, the FAA ended the 20-month grounding, the longest ever of a U.S. airliner. The accidents and grounding cost Boeing an estimated $20billion in fines, compensation, and legal fees, with indirect losses of more than $60 billion from 1,200 cancelled orders.^{[1] [6]} The MAX resumed commercial flights in the U.S. in December 2020, and was recertified in Europe and Canada by January 2021.^[7]

In January 2024, Alaska Airlines Flight 1282, suffered a mid-flight blowout of a plug filling an unused emergency exit on January 5, 2024, causing rapid decompression of the aircraft. The FAA grounded some 171 Boeing 737 MAX 9s with a similar configuration for inspections. The Department of Justice believes Boeing might have violated its January 2021 deferred prosecution settlement.^[8] In July 2024, Boeing took ownership of the Alaska Airlines jet, pleaded guilty to criminal charges regarding the fatal accidents; and was ordered to allocate funds towards execution of an independently monitored safety compliance program.

Groundings

See main article: List of Boeing 737 MAX groundings.

Accident investigations

See also: Aviation accident analysis. ICAO regulations Annex 13, "Aircraft Accident and Incident Investigation", defines which states may participate in investigations. For the two MAX accidents these are:^[9]

1. Indonesia, for Lion Air Flight 610 as the state of registration, state of occurrence, and state of the operator.
2. Ethiopia, for Ethiopian Airlines Flight 302, as the state of registration, state of occurrence, and state of the operator.
3. The United States, as the state of manufacturer and issuer of the type certificate.

The participating state or national transportation safety bureaus are the NTSB for the US and the NTSC for Indonesia. Australia and Singapore also offered technical assistance, shortly after the Lion Air accident, regarding data recovery from the new generation flight recorders (FDR). With the exception of Ethiopia, the officially recognized countries are members of the Joint Authorities Technical Review (JATR).

Lion Air Flight 610

See main article: Lion Air Flight 610.

Preliminary investigations revealed serious flight control problems that traumatized passengers and crew on the aircraft's previous flight, as well as signs of angle-of-attack (AoA) sensor and other instrument failures on that and previous flights, tied to a design flaw involving the Maneuvering Characteristics Augmentation System (MCAS) of the 737 MAX series. The aircraft maintenance records indicated that the AoA sensor was just replaced before the accident flight.^[10] The report tentatively attributed the accident to the erroneous angle-of-attack (AoA) data and automatic nose-down trim commanded by MCAS.^{[11] [12]}

The NTSC final report, published on October 23, 2019, was prepared with assistance from the U.S. NTSB. NTSC's investigator Nurcahyo Utomo identified nine factors to the accident, saying:

"The nine factors are the root problem; they cannot be separated. Not one is contributing more than the other. Unlike NTSB reports that identify the primary cause of accidents and then list contributing issues determined to be less significant, Indonesia is following a convention used by many foreign regulators of listing causal factors without ranking them".^{[13] [14]}

The final report has been shared with families of Lion Air Flight 610, then published on October 25, 2019.^{[15] [16] [17] [18]}

Ethiopian Airlines Flight 302

See main article: Ethiopian Airlines Flight 302.

On March 11, the FAA defended the MAX against groundings by issuing a Continued Airworthiness Notice to operators. The initial reports for Flight 302 found that the pilots struggled to control the airplane in a manner similar to the Lion Air flight 610 crash.^[19] On March 13, 2019, the FAA announced that evidence from the crash site and satellite data on Flight 302 suggested that it might have suffered from the same problem as Lion Air Flight 610 in that the jackscrew controlling the pitch of the horizontal stabilizer of the crashed Flight 302, was found to be set in the full "nose down" position, similar to Lion Air Flight 610.^[20] This further implicated MCAS as contributory to the crash.^{[21] [22] [23]}

Ethiopian Airlines spokesman Biniyam Demssie said that the procedures for disabling MCAS had just been incorporated into pilot training. "All the pilots flying the MAX received the training after the Indonesia crash," he said. "There was a directive by Boeing, so they took that training."^[24] While the pilots initially followed the correct procedure to disable runaway trim, they did not complete the checklist fully, and consequently, the recovery effort did not succeed.^{[25] [26]}

The Ethiopian Civil Aviation Authority (ECAA) led investigations for Flight 302, and the United States Federal Aviation Administration assisted in the investigation.^[27] Both flight recorders (voice and data) were recovered from the crash site on March 11, 2019.^[28] The French aviation accident investigation agency BEA announced that it would analyze the flight recorders from the flight.^[29] BEA received the flight recorders on March 14, 2019.^[30]

On March 17, 2019, Dagmawit Moges, Ethiopia's transport minister, announced that the black box had been found and downloaded, and that the preliminary data retrieved from the flight data recorder show a "clear similarity" with those of Lion Air Flight 610 which crashed off Indonesia.^{[31] [32]} Due to this finding, some experts in Indonesia suggested that the NTSC should cooperate with Flight 302's investigation team.^[33] Later in the evening, the NTSC offered assistance to Flight 302's investigation team, stating that the committee and the Indonesian Transportation Ministry would send investigators and representatives from the government to assist with the investigation of the crash.^[34]

The Ethiopian Civil Aviation Authority published an interim report on March 9, 2020, one day before the March 10 anniversary of the crash.^[35] Investigators tentatively concluded that the crash was caused by the aircraft's design.^{[36] [37] [38] [39]} On December 23, 2022, the Ethiopian Aircraft Accident Investigation Bureau published its final report on the crash, concluding the probable cause was "Repetitive and uncommanded airplane-nose-down inputs from the MCAS", due to false input from the angle of attack (AoA) sensor.^[40]

Timeline

2016

• March 2016, The General Manager of Boeing's 737 MAX program and the former Chief Project Engineer on the 737 MAX program both approved a redesign of MCAS to increase its authority to move the aircraft's stabilizer at low speed, in order to address "stall characteristics" requirements necessary for FAA certification. Just hours after the approval for MCAS's redesign was granted, Boeing sought, and the FAA approved, the removal of references to MCAS from Boeing's flight crew operations manual (FCOM). The FAA officials who authorized this request remained unaware of the redesign of MCAS until after the crash of the Lion Air flight.^[41]

2018

• January 10, The Operational Evaluation Report of the National Civil Aviation Agency of Brazil (ANAC) mentions the MCAS.^[42] The FAA had approved Boeing's request to remove MCAS from differences tables and quick reference handbook (QRH);^{[43] [44]} The Operational Evaluation Report prepared by Transport Canada contained the same table as ANAC's, except the reference to MCAS.
• October 29, a 737 MAX 8 operating Lion Air Flight 610 crashed after take-off from Jakarta, killing all 189 on board. Boeing started redesigning the MCAS system right after the accident.^[45]
• November 6, Boeing issued an Operations Manual Bulletin (OMB),^[46] describing a MAX-specific feature of the pitch trim system, warning that with "erroneous data, the pitch trim system can trim the stabilizer nose down in increments lasting up to 10 seconds" which "can be stopped and reversed with the use of the electric stabilizer trim switches but may restart 5 seconds after" and instructed pilots to counteract it by running the Runaway stabilizer and manual trim procedure.^[47] The background introduction of the bulletin states: "This bulletin directs flight crews to existing procedures to address this condition", and reminds operators to use the "existing procedures in the Runaway Stabilizer NNC [Non-Normal Checklist]" when the MAX reacts to a false stall detection.^[48] This was Boeing's first public announcement about MCAS, albeit not by name.^[49]
• November 7, the FAA issued an Emergency airworthiness directive to owners and operators,^[50] requiring revising the aircraft flight manual (AFM) "to provide the flight crew with runaway horizontal stabilizer trim procedures" when "repeated nose-down trim commands" are caused by "an erroneously high single AoA sensor", reinforcing the Boeing bulletin.^[51] The FAA directive warned that the problem was an "unsafe condition" that could result in "impact with terrain".^[52] The directive informs pilots of a new function specific to MAX models : "Note: The 737-8/-9 uses a Flight Control Computer command of pitch trim to improve longitudinal handling characteristics. In the event of erroneous Angle of Attack (AoA) input, the pitch trim system can trim the stabilizer nose down in increments lasting up to 10 seconds." The FAA had removed reference to MCAS from its draft EAD.^[53]
• November 10, Boeing referred publicly for the first time to the MCAS by name in a Multi Operator Message to operators.^{[54] [55] [56]} The MCAS control law, a few lines of software code in the, could autonomously command nosedives, when even a single sensor failure resulted in bad data; MCAS was omitted from aircraft manuals and training, therefore flight crews had no knowledge of its existence or functioning until Boeing published a bulletin on November 6.
• November 27, the Allied Pilots Association of American Airlines had a meeting with Boeing to express concerns with the MCAS effectiveness, and was unnerved by the airframer's responses. Union president Daniel Carey later said, "The huge error of omission is that Boeing failed to disclose the existence of MCAS to the pilot community. The final fatal mistake was, therefore, the absence of robust pilot training in the event that the MCAS failed".^[57] The Boeing officials acknowledged that they were considering some changes, for example preventing MCAS's repetitive activation to ensure that it only triggers once.^[58]
• December 3, the FAA Seattle Certification Office reviewed an unpublished quantitative risk assessment analysis of the MAX, prepared using the "Transport Aircraft Risk Assessment Methodology" (TARAM). The U.S. House Committee on Transportation and Infrastructure made the report public just over a year later, on December 11, 2019. In the committee's words, the report concluded that "if left uncorrected, the MCAS design flaw in the 737 MAX could result in as many as 15 future fatal crashes over the life of the fleet", predicting 2900 deaths over 30 years.^[59]
• December 17, in a presentation to the FAA, Boeing deflected blame and continued to assert that appropriate crew action would save the aircraft.^[60]

2019

• March 10, another 737 MAX 8 operating Ethiopian Airlines Flight 302 crashed shortly after take-off from Addis Ababa airport, killing all 157 on board, due to a similar faulty MCAS, initiating a worldwide flight ban for the aircraft, starting with China on March 11. This was followed in quick succession the following day, March 12 by Indonesia, Singapore, India, Turkey, South Korea, the European Union, Australia and Malaysia. See timeline and list of groundings by other countries and regions. The US FAA issued an affirmation of the continued airworthiness of the 737 MAX.^[61]
• March 13, the U.S. FAA was among the last to order the grounding of the 737 MAX, after claiming there was no reason: China had the most aircraft in service, 96, followed by the U.S. with 72, Canada with 39 and India with 21. The FAA issued an Emergency Order of Prohibition grounding Boeing 737 MAX airplanes, followed by a CANIC.^[62]
• March 20, EASA and Transport Canada indicated that they would conduct their own reviews of Boeing's proposed software update.^[63]
• March 27, Boeing unveiled a software update to avoid MCAS errors, which was pending certification after already being developed and tested in-flight.
• April 5, Boeing announced it was cutting 737 production by almost a fifth, to 42 aircraft monthly, anticipating a prolonged grounding, and had formed an internal design review committee.
• May 13, Republican Congressman Sam Graves at the House Aviation subcommittee hearing, blamed the 737 MAX crashes on poor training of the Indonesian and Ethiopian pilots; he stated that "pilots trained in the U.S. would have been successful" in handling the emergencies on both jets.^{[64] [65]}
• June 18, IAG signed a letter of intent for 200 737 MAXs at the Paris air show, followed by Turkish SunExpress and Air Astana later in the year.
• June 26, flight tests for the FAA uncovered a data processing issue affecting the pilots' ability to perform the "runaway stabilizer" procedure to respond to MCAS errors.
• October 30, Boeing CEO Dennis Muilenburg testified before U.S. Congress committees, defending Boeing's safety culture and denying knowledge of internal messages in which Boeing's former chief technical pilot said he had unknowingly lied to regulators, and voiced his concerns on MCAS.
• November 22, Boeing unveiled the first 737 MAX 10 flight-test aircraft.
• November 26, the FAA revoked Boeing's Organization Designation Authorization to issue airworthiness certificates for individual MAX airplanes.^[66]
• December 17, Boeing confirmed the suspension of 737 MAX production from January 2020.
• December 23, Dennis Muilenburg resigned, to be replaced by board chairman Dave Calhoun.

2020

• January 7, Boeing recommended "simulator training in addition to computer based training".^[67]
• January 9, Boeing released previous messages in which it claimed no flight simulator time was needed for pilots, and distanced itself from internal emails mocking airlines and the FAA, and criticizing the 737 MAX design.
• January 13, Dave Calhoun became CEO, pledging to improve Boeing's commitment to safety and transparency, and estimating the return to service in mid-2020.
• January 21, Boeing estimated the ungrounding could begin in mid-2020.^[68]
• May 27, Boeing resumed production of the MAX at a "very gradual pace".^[69]
• June 28 to July 1, the FAA conducted flight tests with a view to recertification of the 737 MAX.^[70]
• September 16, the U.S. House of Representatives releases its concluding report, blaming Boeing and the FAA for lapses in the design, construction and certification.^[71]
• September 30, a Boeing 737 MAX test aircraft was flown by FAA administrator Stephen Dickson.^[72]
• October 16, Patrick Ky, the executive director of the European Union Aviation Safety Agency, claimed that the updated 737 MAX reached the level of safety "high enough" for EASA.^[73]
• November 18, the FAA issued a CANIC (Continued Airworthiness Notification to the International Community), subject to mandatory updates on each individual aircraft.^[74] Other regulators were expected to follow.^[75]
• December 9, Brazilian low-cost carrier Gol Transportes Aéreos was the first airline to resume passenger service.^[76]
• December 29, American Airlines was the first US airline to resume commercial operations.^[77]

2021

• January 7, Boeing settled to pay over $2.5 billion after being charged with fraud over the company's hiding of information from safety regulators: a criminal monetary penalty of $243.6 million, $1.77 billion of damages to airline customers, and a $500 million crash-victim beneficiaries fund.^{[78] [79]}
• January 13, the Trinidad and Tobago Civil Aviation Authority authorized the MAX to resume flights in Trinidad and Tobago's airspace.^[80]
• January 18, Transport Canada authorized the MAX to resume flights in Canadian airspace.^[81] Canadian operators must modify the aircraft to enable pilots to disable the stick shaker when it is erroneously activated, if they are certain that they understand the underlying cause.^[82]
• January 27, EASA cleared the MAX to resume service in Europe, subject to additional restrictions similar to those mandated by Transport Canada.^[83] Certain approaches requiring precision navigation were however not yet approved as EASA was awaiting data from Boeing as to the aircraft's ability to maintain the required performance in the event of sensor failures.^[84]
• February 26, the Australian Civil Aviation Safety Authority lifted its ban on the MAX, accepting the return-to-service requirements set by the FAA. Australia was the first nation in the Asia-Pacific region to clear the aircraft to return to service.^[85]
• April 9, Boeing announces that it has notified 16 airlines and the FAA of a potential electrical problem. Boeing refused to say how many planes were affected but four airlines grounded nearly 70 MAX aircraft.^[86]
• August 26, the Indian Directorate General of Civil Aviation rescinds its ban on MAX airplanes in India on the condition that they meet the requirements set by the FAA and EASA.^{[87] [88]}
• September 2, Boeing and Ethiopian Airlines reach an undisclosed out-of-court settlement, with Ethiopian Airlines announcing that the MAX could return to service in January 2022.^[89] The same day, the Civil Aviation Authority of Malaysia rescinded its ban on the MAX.^{[90] [91]}
• October 14, federal prosecutors indict former Boeing pilot Mark Forkner for fraud, stating he lied to the FAA in an attempt to obtain money from customers. Forkner is the first person to receive criminal charges in the investigation.^[92]
• December 2, China's civil aviation regulator cleared the 94 jets stored by 11 carriers in China to fly again, before resuming deliveries in early 2022 of the ~ planes currently stored by Boeing, as over 180 countries out of 195 have lifted the grounding.^[93]
• December 28, Indonesia's ministry of transport removes its ban on the MAX.^[94]

2022

• February 1, Ethiopian Airlines cleared the MAX to return to service, with a demonstration flight being held the same day.^[95]
• March 23, Mark Forkner is acquitted of fraud.^[96]

2023

• January 13, China Southern Airlines returned the MAX to service.^[97] In 2019, Chinese aviation authorities grounded all Boeing 737 Max over safety concerns. The planes were allowed to return to service approximately 4 years later.^{[98] [99]}
• In April 2023, it was revealed that US engineers had recommended grounding 737 Max immediately following the Ethiopian Airlines accident.^[100]
• December 28, the FAA revealed that Boeing had asked airlines to check newer 737 MAX aircraft for a possible loose screw in the rudder control system. The FAA wants to "closely monitor" the targeted inspections and consider additional measures if further loose or missing components are discovered.^[101]

2024

See also: Alaska Airlines Flight 1282.

• January 5: Alaska Airlines grounds their 737 MAX 9 fleet after a door plug blows out mid-air.^[102] Reports said the seat next to the left-hand panel, which contains an ordinary passenger window, was unoccupied. "This is a very, very serious situation and it could have been a lot worse," "If someone had been sitting in that seat, and they weren't buckled in, it would have been a different situation."^[103]
• January 6: the FAA issues an emergency airworthiness directive (EAD) mandating inspection of door plugs on 737 MAX 9 aircraft, temporarily grounding the 171 aircraft affected.^{[104] [105] [106]}
• January 7: EASA mandates inspection of affected 737 MAX 9 aircraft under its jurisdiction.^[107]
• January 8: the FAA approved a method to comply with the January 6 EAD. They also release a statement that all affected "aircraft will remain grounded until operators complete enhanced inspections which include both left and right cabin door exit plugs, door components, and fasteners. Operators must also complete corrective action requirements based on findings from the inspections prior to bringing any aircraft back into service."^[108]
• January 8: United Airlines and Alaska Airlines confirm in statements that they found loose bolts and other installation issues in the plug doors in multiple aircraft.^{[109] [110] [111] [112]}
• January 11: The FAA announces an investigation into Boeing "to determine if Boeing failed to ensure completed products conformed to its approved design and were in a condition for safe operation."^[113]
• January 12: The FAA announces that they are auditing the 737 MAX production, increasing monitoring of "In-service events" and assessing the "safety risks around delegated authority and quality oversight"^[114]
• January 24: The FAA clears 737 MAX 9s with door plugs to return to service once inspections processes are complete.^[115]
• January 26: Alaska Airlines returns its 737 MAX 9 fleet to service.^[116]
• January 27: United Airlines clears its 737 MAX 9 fleet to resume service.^[117]
• March 7: A new investigation is launched after a United Airlines experienced stuck rudder pedals on February 6.^[118]
• March 9: Boeing whistleblower John Barnett, who had previously raised safety concerns about Boeing, commits suicide in South Carolina due to stress from a 2017 whistleblower case.^{[119] [120] [121]}
• March 11: The United States Department of Justice launches a criminal investigation into the Alaska Airlines incident.^[122]
• March 25: Dave Calhoun announces that he will step down as CEO at the end of 2024.^{[123] [124] [125]}
• May 4: Joshua Dean, another Boeing whistleblower who was fired from Spirit Aerosystems a month earlier, dies due to a sudden illness.^[126]
• May 25: A Southwest Boeing 737 MAX has been withdrawn from service after experiencing an inflight Dutch Roll. Investigations found substantial damage to the aircraft's rudder system.^[127]
• June 26: Korean Air Boeing 737 MAX 8 drops 27,000 ft in 15 minutes injuring 17 people.^[128]
• June 27: Boeing was sanctioned by the NTSB for holding a meeting with reporters on June 25 where the company shared information about the Flight 1282 investigation along with analysis of the facts without authorization.^[129]
• June 28: Alaska returns the aircraft involved in Flight 1282 to Boeing, to reduce storage and maintenance costs for the airline.^{[130] [131]}
• June 30: Boeing agrees to buy back Spirit AeroSystems for $4.7 billion to bring 737 fuselage construction in-house. The deal is expected to close in mid-2025.^{[132] [133]}
• July 7: Boeing agrees to plead guilty to a felony fraud charge in a deal with the US Justice Department. Boeing also agreed to pay a $487.2 million fine, spend at least $455 million over three years on compliance and safety programs and be supervised by an independent monitor.^[134]

Type certification and return to service

See main article: Boeing 737 MAX certification.

Maneuvering Characteristics Augmentation System

See main article: Maneuvering Characteristics Augmentation System. MCAS on the 737 MAX was designed to mimic the pitching behavior of the previous generation of the series, the Boeing 737 NG, by pushing down the aircraft nose from an elevated angle of attack (AoA) by automatically adjusting the horizontal stabilizer and trim tab. The system was intended to protect pilots from inadvertently flying at too steep an angle, which could result in a stall. Boeing, however, asserted that MCAS was not an anti-stall system, as the media widely reported it to be. Pilot movement of the control column on the MAX did not disable MCAS, unlike an earlier implementation of MCAS on the U.S. Air Force Boeing 767 Tanker. During certification of the MAX, Boeing requested and received permission from the FAA to remove a description of MCAS from the aircraft manual, leaving pilots unaware of the system when the airplane entered service in 2017.^{[135] [136]} Boeing had also knowingly withheld knowledge, for at least a year before the Lion Air crash, that a system to warn of a possible AoA malfunction did not work as advertised.^[137]

On November 6, 2018, Boeing published a supplementary service bulletin prompted by the first crash. The bulletin says warnings triggered by erroneous AoA data could cause the pitch trim system to repeatedly push down the nose of the airplane and referred pilots to a "non-normal runaway trim" procedure as resolution, specifying a narrow window of a few seconds before the system would reactivate and pitch the nose down again.^[138] The FAA issued an emergency airworthiness directive, 2018-23-51, on November 7, 2018, requiring the bulletin's inclusion in the flight manuals, and that pilots immediately review the new information provided.^{[139] [140]} Pilots wanted to know more about the issue, and Boeing responded by publicly naming MCAS for the first time in another message to airlines, noting that MCAS operates "without pilot input."^{[141] [142]}

In December 2018, the FAA had privately predicted that 15 MCAS-related accidents could result if the system was not redesigned. Boeing said it would revise MCAS software by April 2019 to correct any problems. The study was only revealed a year later at the December 2019 House of Representatives hearing. Stephen Dickson, who became FAA administrator during the accident investigations, testified at the hearing about his agency's response after the Lion Air accident, saying "the result was not satisfactory".^[143]

After the March 2019 crash of Ethiopian Airlines Flight 302, Ethiopian investigators determined that pilots had attempted the recommended recovery procedure.^{[144] [145]} Boeing admitted that MCAS played a role in both accidents by activating when it received faulty data from an exterior AoA sensor.

In 2020, an FAA Airworthiness Directive approved design changes for each MAX aircraft, requiring input from two AoA sensors for MCAS activation, elimination of the system's ability to repeatedly activate, and allowing pilots to override the system if necessary.^[146] Boeing also overhauled the computer architecture of the flight controls to provide greater redundancy. For each aircraft, the FAA would issue the airworthiness certificate, without delegation to Boeing, upon completion of an AoA sensor system test and a validation test flight. The FAA also required that all MAX pilots receive MCAS-related training in flight simulators by 2021. Before the accidents, simulator training on the MAX was not required, because the FAA accepted Boeing's position that the MAX was sufficiently similar to the previous 737 series, the NG.

Reactions

See main article: Reactions to the Boeing 737 MAX groundings.

Financial and economic effects

See main article: Financial impact of the Boeing 737 MAX groundings.

The have had a deep financial effect on the aviation industry and a significant effect on the national economy of the United States. No airline took delivery of the MAX during the groundings. Boeing slowed MAX production to 42 aircraft per month and halted MAX production from January to May 2020. Boeing suffered directly through increased costs, loss of revenue, reputational damage, victim litigation, client compensation, reduced credit rating, and decreased stock value. In January 2020, the company estimated a loss of $18.4 billion for 2019, and it reported 183 canceled MAX orders for the year.

In February 2020, the COVID-19 pandemic and resulting travel bans created further uncertainty for Boeing. In March 2020, news that Boeing was seeking a $60 billion bailout caused a steep drop in its stock price, though Boeing eventually received $17 billion in funds from the coronavirus stimulus.^[147] Its extensive supply chain providing aircraft components and flight simulators suffered similar losses, as did the aircraft services industry, including crew training, the aftermarket, and the aviation insurance industry. Major flight simulator supplier CAE increased production of simulators for the Boeing 737 MAX in anticipation of a jump in demand for pilot training in November 2019.^[148] At the time of the recertification by the FAA in November 2020, Boeing's net orders for the 737 MAX were down by more than 1,000 aircraft,^[149] 448 orders canceled and 782 orders removed from the backlog because they are no longer certain enough to rely on; the total estimated direct costs of the MAX groundings were US$20billion and indirect costs over US$60billion.^[150] On January 7, 2021, Boeing settled to pay over $2.5 billion after being charged with fraud.

Popular culture

In September 2021, PBS released Boeing's Fatal Flaw, a Frontline documentary about how Boeing ignored critical safety issues with the 737 MAX resulting in the crash of two airliners.

In February 2022, Netflix released , a documentary about the two plane crashes^[151] directed by Rory Kennedy.^[152]

See also

• 2013 Boeing 787 Dreamliner grounding: the aircraft was grounded for modifications to mitigate the risk of inflight fire
• Air France Flight 447: fatal accident following data and pitot tube failure and autopilot disablement
• Boeing 737 rudder issues
• Qantas Flight 72: data failure causing pitch down, severely injuring passengers
• Turkish Airlines Flight 1951: Dutch authorities have reopened the accident probe into this 2009 accident involving the prior generation 737-800 series aircraft.^[153]
• List of accidents and incidents involving the Boeing 737

Further reading

• Web site: Baker . Sinéad . Boeing shunned automation for decades. When the aviation giant finally embraced it, an automated system in the 737 Max kicked off the biggest crisis in its history. Business Insider.
• News: Broderick . Sean . The MAX Saga, One Question At A Time . August 15, 2019 . Aviation Week & Space Technology. subscription.
• News: Cox . John . This [the emergency the pilots faced] is not simple ]. May 20, 2019. Leeham News.
• Web site: Delbert . Caroline . The 737 MAX Has Been Grounded for a Year Because of Its Terrible Computers. April 14, 2020. Popular Mechanics. en-US.
• News: Gelles . David . Wichter . Zach . Boeing 737 Max: The Latest on the Deadly Crashes and the Fallout . The New York Times . July 18, 2019 .
• News: Hemmerdinger . Jon . How the 737 Max grounding changed commercial aerospace . March 13, 2020. FlightGlobal.
• News: Hemmerdinger . Jon . Six months on from the Boeing 737 Max grounding . September 13, 2019 . FlightGlobal.
• News: Kaminski-Morrow . David . Why restarting Max production is just the start of Boeing's delivery challenges . March 13, 2020. FlightGlobal.
• News: Leggett. Theo . What went wrong inside Boeing's cockpit? . May 17, 2019. BBC News Online.
• Book: Robison, Peter . 2021 . Flying Blind: The 737 MAX Tragedy and the Fall of Boeing . New York . Doubleday . Hardcover . 978-0385546492.
• News: Thisdell . Dan . Tarnished Max brand presents major challenge for Boeing . March 13, 2020. FlightGlobal.
• Web site: Travis . Gregory . How the Boeing 737 Max Disaster Looks to a Software Developer . IEEE Spectrum . April 18, 2019 .
• Web site: Wolfsteller . Pilar . Inspector general slams Boeing for holding back information on 737 Max. July 1, 2020. Flight Global. en.
• Web site: Boeing 737 MAX Flight Control System - Observations, Findings, and Recommendations . Joint Authorities Technical Review . October 11, 2019.
• The real reason Boeing's new plane crashed twice . . April 15, 2019.
• News: Timeline: The Boeing 737 MAX Crisis . Aviation Week Network . May 16, 2019.
• Boeing's culture and how it drove the development of the 737 Max on Last Week Tonight with John Oliver aired on March 3, 2024

Notes and References

1. News: Isidore . Chris . November 17, 2020 . Boeing's 737 Max debacle could be the most expensive corporate blunder ever . CNN . live . December 21, 2020 . https://web.archive.org/web/20201221001329/https://www.cnn.com/2020/11/17/business/boeing-737-max-grounding-cost/index.html . December 21, 2020.
2. Web site: Team . Legal . October 24, 2019 . How Did the F.A.A. Allow the Boeing 737 Max to Fly? Aviation Law . May 15, 2024 . Panish Shea Ravipudi LLP . en-US.
3. Web site: March 14, 2019. Editorial: Why was the FAA so late to deplane from Boeing's 737 Max?. July 20, 2021. Los Angeles Times. en-US. July 20, 2021. https://web.archive.org/web/20210720135818/https://www.latimes.com/opinion/editorials/la-ed-trump-faa-737-max-grounded-20190314-story.html. live.
4. News: Preliminary Crash Report Says Ethiopian Airlines Crew Complied With Procedures. May 28, 2021. NPR. April 4, 2019. en. Paris. Francesca. Romo. Vanessa. March 3, 2021. https://web.archive.org/web/20210303072156/https://www.npr.org/2019/04/04/709766379/preliminary-crash-report-says-ethiopian-airlines-crew-complied-with-procedures. live.
5. News: Rucinski. David. Shepardson. Tracy. October 30, 2019. U.S. lawmakers question Boeing's $1 mln rebate clause for Southwest 737 MAX orders. Reuters. January 28, 2021. February 7, 2021. https://web.archive.org/web/20210207103511/https://www.reuters.com/article/us-boeing-airplane-southwest-idUSKBN1X92D4. live.
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7. News: The American Machinist. EU to Clear 737 MAX to Fly in January. November 23, 2020 .
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14. Web site: Investigators spread blame in Lion Air crash, but mostly fault Boeing and FAA. Liebermann. Oren. CNN. 2019-10-25.
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20. News: Piece Found at Boeing 737 Crash Site Shows Jet Was Set to Dive. March 14, 2019. Bloomberg News. March 18, 2019. March 15, 2019. https://web.archive.org/web/20190315190615/https://www.bloomberg.com/news/articles/2019-03-15/piece-found-in-crash-wreckage-said-to-show-jet-was-set-to-dive. live.
21. News: New Evidence in Ethiopian 737 Crash Points to Connection to Earlier Disaster. Nicas. Jack. March 15, 2019. The New York Times. Kaplan. Thomas. Glanz. James. March 16, 2019. March 16, 2019. https://web.archive.org/web/20190316021608/https://www.nytimes.com/2019/03/15/business/boeing-ethiopian-crash.html. live.
22. News: Why Investigators Fear the Two Boeing 737s Crashed for Similar Reasons. Glanz. James. March 13, 2019. The New York Times. Lai. K.K. Rebecca. Wu. Jin. March 16, 2019. March 15, 2019. https://web.archive.org/web/20190315212556/https://www.nytimes.com/interactive/2019/03/13/world/boeing-737-crash-investigation.html. live.
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25. Web site: Gates . Dominic . April 3, 2019 . Why Boeing's emergency directions may have failed to save 737 MAX . live . https://web.archive.org/web/20210313142220/https://www.seattletimes.com/business/boeing-aerospace/boeings-emergency-procedure-for-737-max-may-have-failed-on-ethiopian-flight/ . March 13, 2021 . January 26, 2022 . The Seattle Times.
26. Web site: Ostrower . Jon . 2019-04-04 . Vestigial design issue clouds 737 Max crash investigations . 2024-07-15 . The Air Current . en-US.
27. News: U. S. authorities to assist in investigation of Ethiopian Airlines crash that killed 157 . . March 10, 2019 . Faiz . Siddiqui . January 24, 2020 . March 11, 2019 . https://web.archive.org/web/20190311012253/https://www.washingtonpost.com/local/trafficandcommuting/us-authorities-to-assist-in-investigation-of-ethiopian-airlines-crash-that-killed-157/2019/03/10/29b693ec-4349-11e9-8aab-95b8d80a1e4f_story.html . live .
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29. News: Hepher . Tim . France to analyze Ethiopian Airlines flight recorders: spokesman . Reuters . March 13, 2019 . January 26, 2022 . March 14, 2019 . https://web.archive.org/web/20190314010303/https://www.reuters.com/article/us-ethiopia-airplane-france-bea/france-to-analyze-ethiopian-airlines-flight-recorders-spokesman-idUSKCN1QU2T7 . live .
30. Web site: The Black Boxes From Ethiopian Flight 302: What's On Them And What Investigators Will Look For. Kiernan. Kristy. Forbes. January 26, 2022. March 15, 2019. https://web.archive.org/web/20190315193026/https://www.forbes.com/sites/kristykiernan/2019/03/15/the-black-boxes-from-ethiopian-flight-302-what's-on-them-and-what-investigators-will-look-for/. live.
31. Web site: Data on Ethiopia crash: 'Clear similarity' to Indonesia crash . Politico . March 17, 2019 . January 24, 2020 . March 27, 2019 . https://web.archive.org/web/20190327210152/https://www.politico.com/story/2019/03/17/ethiopia-plane-crash-boeing-1224259 . live .
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33. Web site: Mohammad Azka. Alasan KNKT Minta Dilibatkan Menginvestigasi Tragedi Ethiopian Airlines. Bisnis. id. March 13, 2019. Rinaldi. Reasons NTSC Asked To Be Involved In Investigating Ethiopian Airlines Tragedy. September 24, 2019. March 15, 2019. https://web.archive.org/web/20190315185120/https://ekonomi.bisnis.com/read/20190313/98/899028/alasan-knkt-minta-dilibatkan-menginvestigasi-tragedi-ethiopian-airlines. live.
34. Web site: Rosana . Christy . March 14, 2019 . KNKT Tawarkan Bantuan Investigasi Kecelakaan Ethiopian Airlines . NTSC Offers Ethiopian Airlines Accident Investigation Assistance . live . https://web.archive.org/web/20190315151459/https://bisnis.tempo.co/read/1185082/knkt-tawarkan-bantuan-investigasi-kecelakaan-ethiopian-airlines . March 15, 2019 . September 24, 2019 . Tempo . id .
35. Web site: Aircraft Accident Investigation Bureau Interim Report. March 9, 2020. Ethiopian Civil Aviation Authority, Ministry of Transport (Ethiopia). March 26, 2020. March 10, 2020. https://web.archive.org/web/20200310004955/http://www.aib.gov.et/wp-content/uploads/2020/documents/accident/ET-302%20%20Interim%20Investigation%20%20Report%20March%209%202020.pdf. live.
36. Web site: Boeing Set to Get Blame in Ethiopian Report on Crash of 737 Max. Levin. Alan. March 7, 2020. Bloomberg.
37. News: Marks. Simon. Ethiopian Report on 737 Max Crash Blames Boeing. March 9, 2020. The New York Times. Dahir. Abdi Latif. en-US. 0362-4331. March 11, 2020. March 11, 2020. https://web.archive.org/web/20200311184021/https://www.nytimes.com/2020/03/09/world/africa/ethiopia-crash-boeing.html. live.
38. Web site: Ranter . Harro . ASN Aircraft accident Boeing 737 MAX 8 ET-AVJ Addis Ababa-Bole Airport (ADD) . August 9, 2022 . aviation-safety.net.
39. News: March 10, 2021. Tensions Brewing Between Ethiopia, U.S. in 737 Max Crash Probe. Bloomberg. March 28, 2021. March 11, 2021. https://web.archive.org/web/20210311174153/https://www.bloomberg.com/news/articles/2021-03-10/ethiopia-to-release-report-on-boeing-max-crash-in-near-future. live.
40. Web site: December 23, 2022 . Aircraft Accident Investigation Report B737- MAX 8, ET-AVJ . December 28, 2022 . Ethiopian Civil Aviation Authority, Ministry of Transport (Ethiopia) . The Aviation Herald.
41. Final Committee Report on the Design, Development, and Certification of the Boeing 737 MAX. September 15, 2020. The House Committee on Transportation and Infrastructure. 20, Executive Summary.
42. News: November 13, 2018 . Flight control feature of Boeing 737 MAX under scrutiny after Lion Air accident . . January 6, 2021 . January 17, 2021 . https://web.archive.org/web/20210117193634/https://news.aviation-safety.net/2018/11/13/flight-control-feature-of-boeing-737-max-under-scrutiny-after-lion-air-accident/ . live .
43. Web site: August 30, 2019 . The Boeing 737 MAX: examining the design, development, and marketing of the aircraft . Hearing before the committee on transportation and infrastructure house of representatives . U.S. government publishing office . the Maneuver Characteristics Augmentation System (MCAS) flight control law was not originally included In the 737 NG to 737 MAX differences tables nor was a specific reference included in the FCOM/QRH . 134 . January 6, 2021 . January 17, 2021 . https://web.archive.org/web/20210117060244/https://www.govinfo.gov/content/pkg/CHRG-116hhrg38282/pdf/CHRG-116hhrg38282.pdf . live .
44. Web site: Brady. Chris. 737 MAX - MCAS. January 6, 2021. The Boeing 737 Technical Site. Flight Standardisation Board (FSB) : The purpose of this revision is to add the B-737-7, B-737-8200, and ...(MCAS). ... the Design Differences Table from the Boeing 737-800 to the Boeing 737-8 is revised to include ATA 27 Flight Controls addition of MCAS..
45. per Mr Bahrami's testimony, reported in the House FINAL COMMITTEE REPORT: BOEING 737 MAX, section 9, Post-Accident Response
46. Boeing Statement on Operations Manual Bulletin . November 6, 2018 . Boeing . January 6, 2021 . January 8, 2021 . https://web.archive.org/web/20210108095834/https://boeing.mediaroom.com/news-releases-statements?item=130327&asPDF=1 . live .
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48. Web site: September 2020. Final Committee Report on the Design, Development, and Certification of the Boeing 737 MAX. The House Committee on Transportation and Infrastructure. 193–194, 210. en. January 6, 2021. January 8, 2021. https://web.archive.org/web/20210108205543/https://transportation.house.gov/download/20200915-final-737-max-report-for-public-release. live.
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53. See House report
54. The message, MOM-MOM-18-0655-01B, is included in the Lion Air Accident Report.
55. Web site: Hradecky . Simon . Crash: Lion B38M near Jakarta on Oct 29th 2018, aircraft lost height and crashed into Java Sea, wrong AoA data . The Aviation Herald . January 14, 2019 . On Nov 10th 2018 Boeing sent out multi-operator messages informing operators about the MCAS . January 26, 2022 . March 9, 2021 . https://web.archive.org/web/20210309114946/http://avherald.com/h?article=4bf90724%2F0009&opt=0 . live .
56. News: Boeing 737 MAX crisis: a timeline (Part I). July 22, 2019. aerotime.aero. en.
57. Pilot Union President to Call for Accountability from Boeing and Reassessment of FAA Certification Process . June 17, 2019 . Allied Pilots Association.
58. House committee final report
59. News: Hemmerdinger . Jon . Boston . December 12, 2019 . FAA 2018 analysis warned of 15 fatal Max crashes months before second accident . live . https://web.archive.org/web/20200213205409/https://www.flightglobal.com/safety/faa-2018-analysis-warned-of-15-fatal-max-crashes-months-before-second-accident/135747.article . February 13, 2020 . March 14, 2020 . Flightglobal.
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62. Summary of the FAA's review of the Boeing 737 MAX. November 18, 2020. FAA. January 25, 2021. January 23, 2021. https://web.archive.org/web/20210123014042/https://www.faa.gov/foia/electronic_reading_room/boeing_reading_room/media/737_RTS_Summary.pdf. live.
63. News: Koenig . David . March 20, 2019 . European, Canadian regulators to do own review of Boeing jet . Business Insider . Associated Press.
64. Web site: May 15, 2019. How much was pilot error a factor in the Boeing 737 MAX crashes?. The Seattle Times. en-US. July 14, 2020. July 27, 2020. https://web.archive.org/web/20200727034113/https://www.seattletimes.com/business/boeing-aerospace/how-much-was-pilot-error-a-factor-in-the-boeing-737-max-crashes/. live.
65. Web site: May 22, 2019. Blaming Dead Pilots Brought to You by Boeing. Corporate Crime Reporter. en-US.
66. News: Polek . Gregory . November 27, 2019 . FAA To Take Full Control of Max Airworthiness Certification . live . https://web.archive.org/web/20200727024519/https://www.ainonline.com/aviation-news/air-transport/2019-11-27/faa-take-full-control-max-airworthiness-certification . July 27, 2020 . April 3, 2020 . AIN online.
67. Boeing Statement on 737 MAX Simulator Training . Boeing . January 7, 2020 . March 28, 2020 . March 16, 2020 . https://web.archive.org/web/20200316144153/https://boeing.mediaroom.com/news-releases-statements?item=130596 . live .
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69. News: Hemmerdinger . Jon . May 27, 2020 . Boeing restarts 737 Max production . live . https://web.archive.org/web/20200606122342/https://www.flightglobal.com/airframers/boeing-restarts-737-max-production/138571.article . June 6, 2020 . July 4, 2020 . Flightglobal.
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72. News: Hemmerdinger . Jon . September 30, 2020 . FAA's Dickson flies Max, declares 'I like what I saw' . live . https://web.archive.org/web/20201003061526/https://www.flightglobal.com/airframers/faas-dickson-flies-max-declares-i-like-what-i-saw/140404.article . October 3, 2020 . October 1, 2020 . Flight Global.
73. News: Report: Europe closing in on decision to let 737 Max fly . AP News . October 16, 2020 . en.
74. Web site: November 18, 2020. Continued Airworthiness Notification to the International Community. live. Federal Aviation Administration. January 14, 2021. November 24, 2020. https://web.archive.org/web/20201124073334/https://www.faa.gov/foia/electronic_reading_room/boeing_reading_room/media/737_CAN-2020-24.pdf.
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77. Web site: Boeing Max Returns to US Skies With First Passenger Flight . December 29, 2020 . .
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80. Trinidad and Tobago Civil Aviation Authority . January 13, 2021 . Removal of Notice of Flight Prohibition Number 001/2021 .
81. Transport Canada. January 18, 2021. Transport Canada introduces additional requirements to allow for the return to service of the Boeing 737 MAX. January 28, 2021. January 28, 2021. https://web.archive.org/web/20210128062623/https://www.canada.ca/en/transport-canada/news/2021/01/transport-canada-introduces-additional-requirements-to-allow-for-the-return-to-service-of-the-boeing-737-max1.html. live.
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85. Web site: Australia lifts ban on Boeing 737 MAX, a first in Asia-Pacific region. Reuters. February 26, 2021. February 26, 2021. April 22, 2021. https://web.archive.org/web/20210422121457/https://www.reuters.com/article/idUSKBN2AQ09Q. live.
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91. News: September 2, 2021. Malaysia lifts ban on Boeing 737 MAX. Bangkok Post. Reuters. September 3, 2021.
92. News: Chokshi. Niraj. October 14, 2021. Former Boeing Pilot Is Indicted in 737 Max Inquiry. The New York Times. November 1, 2021. 0362-4331. November 1, 2021. https://web.archive.org/web/20211101165002/https://www.nytimes.com/2021/10/14/business/boeing-737-pilot.html. live.
93. News: Wolfsteller. Pilar. December 2, 2021. China approves changes to Boeing 737 Max and clears way for jet's return. Flightglobal. December 3, 2021. December 3, 2021. https://web.archive.org/web/20211203140744/https://www.flightglobal.com/airframers/china-approves-changes-to-boeing-737-max-and-clears-way-for-jets-return/146702.article. live.
94. News: Christina. Bernadette. December 28, 2021. Indonesia allows Boeing's 737 MAX to fly again after deadly crash. Reuters. December 28, 2021. December 28, 2021. https://web.archive.org/web/20211228222807/https://www.reuters.com/world/asia-pacific/indonesia-allow-boeings-737-max-fly-again-after-fatal-crash-2021-12-28/. live.
95. News: Endeshaw. Dawit. February 2, 2022. Ethiopian Airlines flies 737 MAX with passengers for first time since deadly crash. Reuters. February 2, 2022.
96. News: Chokshi . Niraj . March 23, 2022 . Jury Finds Former Boeing Pilot Not Guilty of Fraud in 737 Max Case . The New York Times . April 9, 2023 . 0362-4331.
97. News: Yu . Sophie . Freed . Jamie . January 13, 2023 . Boeing 737 MAX makes first passenger flight in China since March 2019 . en . Reuters . January 13, 2023.
98. Web site: Meilhan . Pierre . Boeing 737 Max 8 takes off in China for the first time since 2019 . CNN . January 13, 2023 . January 6, 2024.
99. Web site: Boeing's long road to the 737 MAX's return in China . Reuters . January 13, 2023 . January 6, 2024.
100. Web site: US engineers recommended grounding Boeing 737 MAX soon after second crash, report says . Reuters . January 7, 2024 . January 7, 2024.
101. Web site: Missing piece on aircraft prompts Boeing to ask airlines to inspect all 737 Max jets . CNN . December 28, 2023 . January 6, 2024.
102. News: January 6, 2024 . Alaska Airlines grounds 737 Max 9 planes after window blows out mid-air . Mackintosh . Thomas . Armstrong . Kathyrn . . January 6, 2024 . en-GB.
103. News: Gill . Oliver . Hellen . Nicholas . February 16, 2024 . Watch: Alaska Airlines Flight 1282 fuselage 'explodes' . . February 16, 2024 . en . 0140-0460.
104. News: FAA Statement on Temporary Grounding of Certain Boeing 737 MAX 9 Aircraft . Federal Aviation Administration . January 16, 2024.
105. Web site: Walker . Mark . Chokshi . Niraj . FAA Orders Some Boeing Max 737 Planes Grounded Pending Inspection . The New York Times . January 7, 2024 . January 7, 2024.
106. Web site: Machi . Sara . Some 737 Max9 returning to service after part blew off Alaska Airlines plane . CBS Chicago . January 6, 2024 . January 7, 2024.
107. Web site: Root . Al . Europe's Decision to Ground Boeing 737 MAX 9 Jets Tells Investors Something . January 7, 2024 . Barrons . en-US.
108. Web site: January 6, 2024 . Updates on Grounding of Boeing 737 MAX 9 Aircraft . live . https://web.archive.org/web/20240108214702/https://www.faa.gov/newsroom/updates-grounding-boeing-737-max-9-aircraft . January 8, 2024 . January 8, 2024 . Federal Aviation Administration.
109. Web site: Ostrower . Jon . January 8, 2024 . United finds loose bolts on plug doors during 737 Max 9 inspections . January 8, 2024 . The Air Current . en-US.
110. Web site: January 8, 2024 . United Airlines found loose bolts, other issues on a key part of grounded Boeing 737 Max 9 jetliners . January 8, 2024 . AP News . en.
111. Web site: Sweeney . Sam . Hutchinson . Bill . United finds loose bolts on 737 Max 9 planes in wake of Alaska Airlines door plug incident . January 9, 2024 . ABC News . en.
112. Web site: January 8, 2024 . Information about Alaska Airlines Flight 1282 . live . https://web.archive.org/web/20240109031832/https://news.alaskaair.com/alaska-airlines/operations/as-1282/ . January 9, 2024 . January 9, 2024 . Alaska Airlines . en-US.
113. Web site: Josephs . Leslie . January 11, 2024 . FAA investigating if Boeing failed to ensure aircraft were safe for operation . January 11, 2024 . CNBC . en.
114. Web site: January 12, 2024 . FAA Increasing Oversight of Boeing Production and Manufacturing . January 12, 2024 . Federal Aviation Administration.
115. News: Koenig . David . January 24, 2024 . FAA approves inspection process that could clear the way for grounded Boeing planes to fly again . live . https://web.archive.org/web/20240128092354/https://apnews.com/article/boeing-ceo-congress-senate-hearing-calhoun-cantwell-f83248428fc32b968a5b9192b79d88ff . January 28, 2024 . January 28, 2024 . Associated Press.
116. News: January 27, 2024 . Alaska Airlines has begun flying Boeing Max 9 jetliners again and United flies plane on Saturday . live . https://web.archive.org/web/20240127151814/https://apnews.com/article/alaska-airlines-boeing-max-grounding-safety-8c20ba0a27e7c074d680e143b4683bdc . January 27, 2024 . January 28, 2024 . Associated Press.
117. News: Shepardson . David . January 27, 2024 . United Airlines resumes Boeing 737 MAX 9 flights after inspections . live . https://web.archive.org/web/20240127181515/https://www.reuters.com/business/aerospace-defense/united-airlines-resumes-boeing-737-max-9-flights-after-inspections-2024-01-27/ . January 27, 2024 . January 28, 2024 . Reuters.
118. News: March 7, 2024 . Boeing 737 Max Under Investigation Over Recent Rudder Failure . March 8, 2024 . Bloomberg.com . en.
119. News: Kaplan . Michael . 2024-05-17 . Boeing whistleblower John Barnett died by suicide, police investigation concludes . 2024-05-18 . CBS News.
120. News: Ember . Sydney . March 12, 2024 . Boeing Whistleblower Who Raised Quality Concerns Is Found Dead . March 12, 2024 . The New York Times . en-US . 0362-4331.
121. News: Aratani . Lori . Masih . Niha . Hsu . Spencer S. . March 12, 2024 . Boeing whistleblower John Barnett found dead . March 12, 2024 . The Washington Post . 0190-8286.
122. News: March 11, 2024 . DOJ Convenes Grand Jury for Criminal Investigation Into Boeing Blowout . March 12, 2024 . Bloomberg.com . en.
123. Web site: CEO Message to Employees . March 25, 2024 . MediaRoom . Boeing.
124. News: Ember . Sydney . March 25, 2024 . Boeing C.E.O. to Step Down in Major Reshuffle at Embattled Plane Maker . March 25, 2024 . The New York Times.
125. Web site: Isidore . Chris . March 25, 2024 . Boeing CEO Dave Calhoun to step down in wake of ongoing safety problems . March 25, 2024 . CNN.
126. News: Graziosi . Graig . May 4, 2024 . Second Boeing whistleblower dies after raising concerns about 737 MAX . May 15, 2024 . The Independent . en.
127. Web site: 2024-06-14 . Southwest Airlines Boeing 737 Max goes into "Dutch roll" during Phoenix-to-Oakland flight - CBS News . 2024-06-14 . www.cbsnews.com . en-US.
128. News: 2024-06-26 . Rapid fall: Korea Air's Boeing 737 Max drops almost 27,000ft in 15 minutes injuring 17 people . 2024-06-27 . The Times of India . 0971-8257.
129. Web site: Ostrower . Jon . Head . Elan . Guisbond . Will . 2024-06-27 . NTSB sanctions Boeing for sharing unauthorized Alaska 1282 information during pre-air show briefing . 2024-06-30 . The Air Current . en-US.
130. News: Ostrower . Jon . 2024-04-23 . Boeing compensation to Alaska includes custody shift of Flight 1282 jet . 2024-04-25 . The Air Current . en-US.
131. Web site: Ostrower . Jon . 2024-06-28 . Alaska formally returns Flight 1282 737 Max 9 to Boeing . 2024-06-30 . The Air Current . en-US.
132. News: June 30, 2024 . Boeing announces purchase of Spirit AeroSystems for $4.7 billion in stock . . . July 1, 2024 .
133. News: Hepher . Tim . Tanna . Shivani . Stone . Mike . July 2, 2024 . Spirit Aero to be broken up as Boeing agrees $4.7 billion stock deal . July 2, 2024 . Reuters.
134. News: Sullivan . Eileen . Kaye . Danielle . 2024-07-08 . Boeing Agrees to Plead Guilty to Felony in Deal With Justice Department . 2024-07-08 . The New York Times . en-US . 0362-4331.
135. News: Laris . Michael . June 19, 2019 . Changes to flawed Boeing 737 Max were kept from pilots, DeFazio says . live . https://web.archive.org/web/20201205125753/https://www.washingtonpost.com/local/trafficandcommuting/changes-to-flawed-boeing-737-max-were-kept-from-pilots-defazio-says/2019/06/19/553522f0-92bc-11e9-aadb-74e6b2b46f6a_story.html . December 5, 2020 . February 29, 2020 . The Washington Post . 0190-8286.
136. "The decision by both the FAA and Boeing to omit information about MCAS from communications with the public, 737 MAX customers, and MAX pilots did not last long. – House report"
137. News: Pasztor . Andy . Tangel . Andrew . Sider . Alison . May 6, 2019 . Boeing Knew of Problem for a Year . The Wall Street Journal . A1.
138. Web site: Boeing nearing 737 Max fleet bulletin on AoA warning after Lion Air crash. November 7, 2018. The Air Current. July 10, 2019. October 13, 2019. https://web.archive.org/web/20191013173531/https://theaircurrent.com/aviation-safety/boeing-nearing-737-max-fleet-bulletin-on-aoa-warning-after-lion-air-crash/. live.
139. Web site: FAA issues emergency AD regarding potential erroneous AOA input on Boeing 737 MAX. November 7, 2018. ASN News. June 7, 2019. June 7, 2019. https://web.archive.org/web/20190607124909/https://news.aviation-safety.net/2018/11/07/faa-issues-statement-on-upcoming-actions-regarding-potential-erroneous-aoa-input-on-boeing-737-max/. live.
140. News: Tangel . Andrew . Pasztor . Andy . Andy Pasztor . July 31, 2019 . Regulators Found High Risk of Emergency After First Boeing MAX Crash . subscription . live . https://web.archive.org/web/20190731113638/https://www.wsj.com/articles/regulators-found-high-risk-of-emergency-after-first-boeing-max-crash-11564565521 . July 31, 2019 . July 31, 2019 . The Wall Street Journal.
141. Web site: Hradecky. Simon. January 14, 2019. Crash: Lion B38M near Jakarta on Oct 29th 2018, aircraft lost height and crashed into Java Sea, wrong AoA data. March 2, 2020. The Aviation Herald. March 9, 2021. https://web.archive.org/web/20210309114946/http://avherald.com/h?article=4bf90724%2F0009&opt=0. live.
142. Web site: Multi Operator Message . Skybrary . January 26, 2021 . June 28, 2021 . https://web.archive.org/web/20210628022933/https://skybrary.aero/bookshelf/books/4479.pdf . live .
143. News: December 11, 2019 . Boeing: US regulator admits 'mistake' over aircraft crashes . live . https://web.archive.org/web/20191212093355/https://www.bbc.com/news/business-50750746 . December 12, 2019 . July 21, 2021 . BBC News.
144. Web site: March 11, 2019. Continued Airworthiness Notification to the International Community. FAA. March 19, 2019. November 3, 2019. https://web.archive.org/web/20191103142508/https://www.faa.gov/news/updates/media/CAN_2019_03.pdf. live.
145. News: July 1, 2020 . Exclusive: Boeing kept FAA in the dark on key 737 MAX design changes - U.S. IG report . live . https://web.archive.org/web/20210506014752/https://www.reuters.com/article/us-boeing-737max-exclusive-idUSKBN2413R6 . May 6, 2021 . July 21, 2021 . Reuters.
146. Web site: November 20, 2020. Airworthiness Directives; The Boeing Company Airplanes. December 12, 2020. rgl.faa.gov. April 18, 2022. https://web.archive.org/web/20220418033632/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/AOCADSearch/FB91ABC41EF06432862586260051E5DF?OpenDocument. dead.
147. News: May 2, 2020. How Boeing went from appealing for government aid to snubbing it. en. Reuters. July 22, 2020. February 22, 2021. https://web.archive.org/web/20210222053032/https://www.reuters.com/article/us-boeing-debt-investors-analysis-idUSKBN22E025. live.
148. News: CAE builds extra Boeing 737 Max simulators, expecting pent-up demand Financial Post. Transportation. Financialpost. November 13, 2019. November 14, 2019.
149. News: FAA clears Boeing 737 Max to fly again 20 months after grounding over deadly crashes . November 18, 2020 . November 18, 2020 . https://web.archive.org/web/20201118164910/https://www.cbsnews.com/news/faa-boeing-737-max-resume-flying/ . November 18, 2020.
150. Web site: Chris Isidore. Boeing's 737 Max debacle could be the most expensive corporate blunder ever. November 21, 2020. CNN. November 17, 2020 . December 21, 2020. https://web.archive.org/web/20201221001329/https://www.cnn.com/2020/11/17/business/boeing-737-max-grounding-cost/index.html. live.
151. Web site: Kenigsberg . Ben . 'Downfall: The Case Against Boeing' Review: Behind Two Fatal Crashes . The New York Times . February 19, 2022 . February 17, 2022.
152. Web site: Review: Netflix doc 'Downfall: The Case Against Boeing' explores cost of greed over safety . Los Angeles Times . February 19, 2022 . February 18, 2022.
153. Web site: Boeing refuses to play ball as Dutch MPs reopen 2009 crash involving 737. euronews. February 7, 2020. February 8, 2020. February 9, 2020. https://web.archive.org/web/20200209222847/https://www.euronews.com/2020/02/07/boeing-refuse-to-play-ball-as-dutch-mps-reopen-2009-crash-case-involving-737-max. live.

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