The AD requires flight crew to comply with a runaway stabiliser procedure in the Boeing operating procedures manual.
KNKT said that there was a problem with the sensor on the last flight taken by the doomed plane, from the island of Bali to Jakarta, even though one sensor had been replaced in Bali.
Indonesian investigators said on Wednesday the plane had experienced instrument failures on four flights, including on one journey where both the angle of attack (AOA) sensor and the airspeed indicator were affected. Aviation regulators such as the FAA and the European Aviation Safety Agency often follow such actions by mandating that carriers follow the bulletins - something the FAA says it will do in this case.
False readings from the sensor can cause the aircraft to pitch downward in an attempt to avoid a stall when the plane is not being flown on autopilot. The plane went into a sudden dive but the pilots were able to recover control and chose to fly on to Jakarta at a lower-than-normal altitude. They chose to fly on to Jakarta at a lower-than-normal altitude. Its flight crew had requested permission to return to the airport several minutes after taking off. "Is this fatal? NTSC (National Transportation Safety Committee) wants to explore this", he said.
Experts say the angle of attack is a crucial parameter that helps the aircraft's systems understand whether its nose is too high relative to the current of air - a phenomenon that can throw the plane into an aerodynamic stall and make it fall.
"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.
But a Boeing statement said a safety bulletin, sent to airlines on November 6, directs flight crews to existing guidelines on how they should respond to erroneous "angle of attack" data. Pilots flying with an AOA sensor generating erroneous inputs to the system can experience the inability to engage the aircraft's autopilot system, among other problems.
Khashoggi's body was dissolved in acid, Turkish adviser says
He said the USA is "reviewing" potential sanctions on individuals it has identified in relation to Khashoggi's murder. It was later discovered that he had been killed while inside, as his murder sparked a major diplomatic storm.
"We don't know what the crew knew and didn't know yet", Cox said.
The flight procedure recommendations to Boeing were based on how the flight crew responded to problems on the Bali-to-Jakarta flight, said investigator Nurcahyo Utomo.
In fact, the 737 remains the best-selling airliner of all time, while the new MAX variant quickly became quickest selling plane in Boeing history.
Divers have recovered one of the two "black boxes" - the flight data recorder - but are still looking for the cockpit voice recorder, in the hope it will shed more light on the cause of the accident.
Indonesian officials said on Wednesday they would extend the search by three days.
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. In December 2014, an AirAsia flight from Surabaya to Singapore plunged into the sea, killing all 162 on board.