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| 737 MAX groundings | |
|---|---|
| Name | 737 MAX groundings |
| Caption | Grounded Boeing 737 MAX fleet at various airports during global grounding |
| Date | 2018–2020 |
| Location | Worldwide |
| Aircraft | Boeing 737 MAX |
| Type | Fleet grounding |
| Cause | Safety concerns following accidents and investigations |
737 MAX groundings
The 737 MAX groundings were a series of international fleet suspensions affecting the Boeing 737 MAX after two fatal crashes in 2018 and 2019 prompted investigations, regulatory action, and corporate reforms. The grounding involved complex interactions among Boeing, the Federal Aviation Administration, global civil aviation authorities such as the European Union Aviation Safety Agency, affected carriers like Lion Air and Ethiopian Airlines, and supply-chain partners including Spirit AeroSystems and General Electric. The episode reshaped relationships between manufacturers, regulators, and operators, influencing certification paradigms and aviation safety culture.
The 737 MAX program was developed by Boeing Commercial Airplanes as a successor to the Boeing 737 Next Generation series to compete with the Airbus A320neo family following market pressures from Airbus SE and orders from airlines including Southwest Airlines, American Airlines, and Ryanair. The design incorporated larger LEAP-1B engines manufactured by CFM International, redesigned winglets and updated flight decks influenced by input from Transport Canada and other certification bodies. Development involved engineering at Boeing Field, supply integration with Spirit AeroSystems, and contractual negotiations with lessors such as Avolon and GECAS.
The first crash was Lion Air Flight 610 on 29 October 2018 near Jakarta; the second was Ethiopian Airlines Flight 302 on 10 March 2019 near Addis Ababa. Both accidents resulted in the loss of nearly identical aircraft types and triggered multinational responses from authorities including the Indonesian National Transportation Safety Committee, the Ethiopian Civil Aviation Authority, the National Transportation Safety Board, and the International Civil Aviation Organization. Public attention focused on carrier Lion Air, operator training records, flightcrew communications, and global reactions from airlines such as Norwegian Air Shuttle and TAP Air Portugal that had ordered the type.
Investigations by the National Transportation Safety Board and the Indonesian National Transportation Safety Committee identified the Maneuvering Characteristics Augmentation System (MCAS) as a critical factor; MCAS relied on input from angle of attack sensors and trim actuators sourced from suppliers including Moog Inc. and integrated into flight-control software developed by Boeing engineers working with contractors. Reports cited pilot response, crew resource management training influenced by International Air Transport Association guidance, maintenance oversight by carriers such as Lion Air and Ethiopian Airlines, and certification processes involving delegated tasks to Boeing under the Federal Aviation Administration Organization Designation Authorization program. Investigation documents referenced communications among executives at Boeing Commercial Airplanes, comments from former FAA officials, and testimony before legislative bodies such as the United States Congress and the United Kingdom House of Commons.
In March 2019 authorities issued near-simultaneous grounding orders: the Civil Aviation Administration of China acted alongside the European Union Aviation Safety Agency and the Civil Aviation Authority of Singapore, while the Federal Aviation Administration initially resisted before issuing an emergency order. Nations including Canada, Australia via the Civil Aviation Safety Authority, Ethiopia, Indonesia, Brazil through National Civil Aviation Agency (ANAC), and India implemented groundings or operational restrictions; major carriers affected included Southwest Airlines, United Airlines, China Southern Airlines, and Turkish Airlines. Legal and diplomatic dimensions involved inquiries by the United States Department of Transportation, lawsuits filed in jurisdictions such as New York (state) and King County, Washington, and parliamentary scrutiny in the United States Congress and European Parliament.
In response Boeing announced leadership changes at Boeing Commercial Airplanes and corporate governance reforms at The Boeing Company, including updates to safety management led by executives and board oversight involving figures with ties to Boeing investors and regulators. Boeing reorganized engineering processes, increased transparency with the Federal Aviation Administration, and revised supplier oversight with firms such as Spirit AeroSystems and Honeywell International. Internal reviews referenced organizational culture critiques similar to historical corporate safety debates involving Pan American World Airways and regulatory tensions reminiscent of past United States Department of Transportation oversight cases.
Boeing developed software updates to MCAS, including revised logic and redundancy using dual angle of attack inputs, and updated pilot manuals and training syllabi coordinated with Air Line Pilots Association, International and regulatory agencies such as the European Union Aviation Safety Agency and the Federal Aviation Administration. Recertification involved extensive flight testing at facilities including Boeing Field and collaboration with test crews from FAA and international authorities; measures included simulator sessions, software verification by independent auditors, and airworthiness directives issued by regulators. The first regulatory approvals to return to service came gradually after compliance checks, modifications to wiring and flight-control laws, and review of maintenance procedures by authorities including Transport Canada and the Civil Aviation Administration of China.
The groundings imposed immediate capacity challenges for operators like Southwest Airlines, American Airlines, and Ryanair, causing schedule disruptions, aircraft leasing adjustments involving lessors such as AerCap and SMBC Aviation Capital, and compensation claims from passengers governed by national aviation consumer protection statutes. Supply-chain effects reached suppliers including Spirit AeroSystems, CFM International, and AAR Corporation, while broader market consequences affected Boeing's financial results, credit ratings monitored by agencies such as Moody's Investors Service and Standard & Poor's, and long-term fleet-planning decisions at airlines such as Norwegian Air Shuttle and LOT Polish Airlines. The episode influenced procurement strategies, insurance negotiations with underwriters in Lloyd's of London, and geopolitical trade considerations involving United States–China aviation commerce.
Category:Aviation safety incidents