Boeing issues advice over sensors after LionAir crash

Parts of an engine of the ill-fated Lion Air flight JT 610 are recovered from the sea during search operations in the Java Sea

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

The crash was the first time one of the airplanes went down.

The Boeing 737 MAX is the fastest-selling plane in company history.

Indonesian investigators said Wednesday the plane had experienced instrument failures on 4 flights, including on one journey where both the 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.

The Lion Air 737 Max 8 jetliner plunged into the Java Sea minutes after takeoff from Jakarta airport, nosing downward so suddenly that it may have hit speeds of 600 miles an hour before slamming into the water.

The bulletin cautions operators of the 737 Max that erroneous readings from one of the plane's sensors can cause the aircraft to enter into a sudden dive. That sensor is meant to maintain air flow over a plane's wings but if it malfunctions can lead to an aerodynamic stall - which can cause aircraft to abruptly dive.

The plane maker said local aviation officials believed pilots might have been given wrong information by the plane's automated systems before the fatal crash.

Capt Mohan Ranganathan, air safety expert, said, "If all AOA sensors are erroneous, it puts a big question mark on the air-worthiness of the aircraft".

"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.

Attempts to fix the issues were unsuccessful, NTSC chairman Soerjanto Tjahjono has said, with the pilots of the 737's second-to-last flight experiencing conflicting information despite an AOA sensor being replaced. FDR data resulted in investigators determining that if an erroneously high single AOA sensor input is received from the aircraft's flight control system, there is a potential for the 737 to repeatedly perform nose-down trim commands of its horizontal stabilizer.

"We don't know what the crew knew and didn't know yet", Cox said.

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

The Boeing 737 Max 8 jets are among the manufacturer's newest models and have been snapped up by airliners in booming aviation markets, including Indonesia and India.More than 200 are in service across the world, billed as the most advanced of the popular 737 jets - and capable of flying more than twice as far than the plane that debuted in 1967. Body parts are still being recovered and searchers continue to hunt for the cockpit voice recorder.

"We have extended the operation for three more days", Muhammad Syaugi, the head of the national search and rescue agency (Basarnas), told Reuters.

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.

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