Boeing to issue safety advice on 737 MAX after Indonesia crash

Boeing to issue safety advice on 737 MAX after Indonesia crash

The directive instructs airlines to make specific changes to flight manual procedures for responding to the problem.

"The Indonesian National Transportation Safety Committee has indicated that Lion Air flight 610 experienced erroneous input from one of its AOA (Angle of Attack) sensors", Boeing said.

The crashed jet reported discrepancy in its angle of attack sensor during a flight the previous day, and device was replaced in Bali after the pilots reported a problem with airspeed reading, the Indonesian transportation safety regulator said Wednesday.

Representatives of 737 MAX operators, Singapore Airlines Ltd SIAL.SI offshoot SilkAir, Garuda Indonesia GIAA.JK and Canada's WestJet Ltd WJA.TO , said they had not yet received a bulletin from Boeing.

This comes in the wake of a new Lion Air Boeing 737 MAX crashing into the sea not long after leaving Jakarta, Indonesia, and killing all 189 passengers on board.

Boeing, which is assisting in an investigation into what went wrong in the October 29 crash of one of its new 737 Max 8 jets, said it issued the bulletin as "part of its usual process".

On the fatal flight, the plane hit the water at very high speed after it had been cleared to return to the airport minutes after becoming airborne.

A problem would occur if the AOA sensor input is erroneous.

Airline safety experts said pilots are trained to handle a plane safely even if those crucial sensors fail.

"They should have been completely engaged in what was going on inside that cockpit, and any kind of warning that came up, they would have been wise to pay attention to it", Curtis said.

Chairman Soerjanto Tjahjono said the airspeed indicator and sensor problems were related.

Investigators are expected to focus on how a single sensor's failure resulted in a faulty command that didn't take into account information from a second sensor, said John Cox, CEO of Safety Operating Systems.

The FAA says the AD is an interim action, and "if final action is later identified, we might consider further rulemaking then".

"Boeing issued an Operations Manual Bulletin (OMB) directing operators to existing flight crew procedures to address circumstances where there is erroneous input from an AOA sensor".

Lion Air said it attended to the problem in accordance with Boeing procedures.

The 737 Max, the fastest-selling plane in Boeing history, is the latest version of the company's 737 family of jets.

Indonesia's search and rescue agency has extended the search until Sunday.

Divers have recovered one of the two "black boxes" - the flight data recorder - but are still searching for the cockpit voice recorder, in the hope it will shed more light on the cause of the disaster.

captionItems recovered from the crash of Lion Air Flight 610.sourceEddy Purwanto/NurPhoto via Getty ImagesIn addition, the analyst explained that such bulletins were quite common, though they seldom follow such a tragedy.

Lion Air is one of Indonesia's youngest airlines but has grown rapidly, flying to dozens of domestic and worldwide destinations.

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