FAA issues 737 MAX emergency AD

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FAA issues 737 MAX emergency AD

Boeing, which manufactured the Lion Air plane, issues safety-related bulletins, and had previously circulated instructions about what flight crews should do if sensors fail.

Indonesia's National Transportation Safety Committee earlier this week had said the plane that crashed had a malfunctioning airspeed indicator on its last four flights, based on analysis of the flight data recorder.

The Boeing 737 MAX 8 then made another flight to Jakarta that same day, and the pilots reported further problems.

A statement and copy of the new directive obtained by Avionics International notes that the agency is issuing an emergency AD requiring a Boeing 737 MAX flight operations manual update.

KNKT is planning to simulate a flight to assess the impact of sensor damage at Boeing's engineering simulator facility in Seattle. One of the critical ways a plane determines if a stall is imminent is the angle of attack measurement.

A preliminary report on the cause of the accident is expected at the end of the month.

Boeing's advisory said the plane experienced "erroneous input from one of its [angle of attack] sensors".

Pilots are trained to disengage the angle-of-attack sensors from the plane's computers when they get false readings.

United Technologies Corp. supplies the angle-of-attack sensors and indicator for the 737 Max, according to Airframers.net.

Lion Air's Flight JT610 plunged into the Java Sea on October 29 shortly after take-off from Jakarta and killed everyone on board.

Lion Air blamed airport staff for the incident, which did not cause any casualties, Efe news reported.

"We will.conduct a special audit of the crews' qualifications and staff communication", transportation minister Budi Karya Sumadi told reporters Monday as he announced the probe into Lion's operations.

Boeing said it is cooperating fully and providing technical assistance as the investigation continues.

Some modern aircraft have systems created to correct the posture of the wings automatically to keep flying safely.

Boeing's safety bulletin also instructs flight crews on the potential malfunction, and the ways in which pilots should respond should the error occur. Such bulletins are routinely issued by aircraft and engine manufacturers, particularly in the wake of major events, and this one does little except to remind crews that the procedures for addressing this situation already exist.

"There are some things that we ask for explanation and some that we ask to be removed, and there has been an agreement between NTSC and Boeing to release a new procedure to all Boeing 737 MAX users in the world". "What will have to be found is, is Boeing pushing itself too hard?" In addition, a system known as elevator trim can be changed to prompt nose-up or nose-down movement. All 62 people on board died.

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