Following two fatal crashes in a span of less than five months, Donald Trump announced that the FAA would issue orders grounding Boeing 737 MAX airliners — following the lead of dozens of countries worldwide that have done the same
Following two fatal crashes in a span of less than five months, President Donald Trump announced that the FAA would issue orders grounding Boeing 737 MAX airliners — following the lead of dozens of countries worldwide that have done the same.
Southwest Airlines issued a press release saying its fleet was largely unaffected, since the grounding only affected 34 of its planes in service — but as of February, the airline still had more than 240 MAX planes on order from Boeing. Dozens of other airlines are in the same position, contemplating whether they need to modify or cancel more than 5,000 planned purchases.
A preliminary investigation of the Lion Air crash suggests that faulty sensors may have engaged the plane’s automatic anti-stall feature, causing pilots to struggle with the controls and lose altitude until the plane crashed into the sea. A lack of pilot familiarity with the plane’s new system may have also been a possible factor.
During the plane’s initial ascent, the plane’s nose is tilted up while the plane gains altitude and speed. A faulty angle-of-attack sensor could record the nose angle as being much steeper than it actually is, leading the MCAS program to anticipate a stall.Based on incorrect or mismatched sensor readings, MCAS overrides the pilot’s controls and automatically pitches the plane nose down — a corrective maneuver to avoid a stall.
In January 2013, the Boeing 787 Dreamliner was grounded because of onboard battery fires, but the plane was allowed back in service months later after design changes were made. Likewise, in June 1979, the FAA grounded the McDonnell Douglas DC-10 following a crash, but reauthorized flights just five weeks later after determining the model was not at fault. The DC-10 subsequently remained in production until the late 1980s.The FAA’s grounding order applies to the Boeing 737 MAX 8 and MAX 9.
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