Lion's earlier admission that the jet had a technical issue - and the captain's request to turn back to the airport minutes before the crash - have raised questions about whether it had faults specific to one of the world's newest and most advanced commercial passenger planes.
Boeing said its bulletin underscored "existing flight crew procedures" created to address circumstances where the information coming into the cockpit from the sensors was wrong.
Following the fatal crash of a Lion Air jet in Indonesia last week, Boeing has issued a warning to airlines operating its new 737 MAX about what to do in the event of an "angle-of-attack" sensor failure and avoid a unsafe nose-dive.
JAKARTA-A crucial sensor was replaced on a Lion Air jet the day before it plunged into the Java Sea, and that sensor replacement may have exacerbated other problems with the plane, Indonesian investigators said Wednesday.
This OMB is a safety notice for all operators of the aircraft type, warning that issues with the AOA (Angle of Attack) indicator could cause the airplane to abruptly descent.
Muhammad Bambang Sukandar, the father of another victim, said Lion Air technicians needed to take "full responsibility" if it was proved they had not properly attended to technical issues following the jet's previous flight from Bali to Jakarta.
Given the situation's fluid nature, Lion Air Group Managing Director Daniel Putut told local media on Monday, November 5, that talks with Boeing over a new order for fifty B737-10s have now been suspended pending the outcome from the Ministry's review. Flight crews are taught to handle "uncommanded nose-down stabilizer trim" by memorizing a procedure to disengage the angle-of-attack inputs to the plane's computer system.
The damage to the device, which tells pilots how fast their planes are travelling, was revealed after the recovery of a "black box" recorder.
The angle of attack sensor keeps track of the angle of the aircraft nose relative to oncoming air to prevent the plane from stalling and diving. If the flow is disrupted by a plane going too slow or climbing too steeply, that can cause an aerodynamic stall and a plane will plummet.
The FAA, which regulates the US aviation industry, hasn't received any reports of airspeed issues occurring on the model in the USA, said a person familiar with the agency's reviews.
It said the bulletin to airlines would alert pilots to follow existing procedures to address the issue.
Visitors watch as a Boeing 737 Max lands after an air display during the Farnborough Airshow, southwest of London, on July 16, 2018.
For a safe climb-out, the aircraft's nose is pitched up at a small angle. In the early days of the jet age, the elevator trim system was linked to several accidents.
The angle of attack is incredibly important.
"The pilots can use extra force to correct the nose down trim, but the failure condition repeats itself, so that the nose-down push begins again 10 seconds after correcting", reported The Seattle Times.