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In a statement released on Tuesday, the airline's builder announced that it had published an "Operations Manual Bulletin" in which it was explaining to air operators how to remedy cockpit reading errors.
A Boeing spokesperson would not advise CNN whether the directive was passed on to operators of all Boeing aircraft, or only to those flying 737 MAX 8 aircraft, the same model as flight 610.
The directive requires operators "to follow the existing procedures of flight crews to handle the erroneous information provided by an AOA sensor," the statement said. "Where appropriate, Boeing, as part of its normal processes, issues bulletins or makes recommendations regarding the operation of its aircraft."
"It's very important, because it tells them if the plane is flying at too high an angle of attack, which can lead to aerodynamic wing stall (loss of lift)," said aviation analyst Geoffrey. and editor at Airlineratings.com Thomas.
Boeing said that the Indonesian National Committee for Transport Safety had "indicated that the Lion Air flight 610 had been confronted with erroneous information issued by one of its AOA sensors (angle of attack)" .
Boeing is participating in the ongoing investigation with the Indonesian National Committee for Transportation Safety and other government authorities in the Lion Air crash and "continues to cooperate fully and provide technical assistance".
Problems on the last four flights
Boeing's statement comes amidst a number of important developments in the investigation of the fatal air disaster, following the discovery of the flight data recorder of Flight 610 last Thursday.
Investigators who analyzed the flight data recorder after the October 29 crash found the problem, said Tjahjono. The discovery is the first technical problem revealed as part of the investigation as to why the plane crashed.
"We are organizing, with the NTSB (US Transportation Safety Board) and Boeing, detailed inspections regarding the speedometer," Tjahjono said on Tuesday.
Captain Daniel Putut Kuncoro Adi, Chief Executive Officer of Lion Air Group, told CNN on Wednesday that Lion Air was following Boeing's guidelines to the letter the 737 MAX 8, as indicated in the service manual.
"The pilots write in the logbook the problem they encountered during the flight, then our technicians correct it and write what they did in the logbook," said the general manager, adding that the technical conversations between the pilot and the technician regarding the aircraft were written. and signed in a document called the flight and maintenance report of the aircraft.
However, analysts have asked why the plane had not been immobilized earlier, while the problem of the airspeed indicator appeared for the first time.
"The question is why this plane was not removed from service and the problem system removed," said Thomas Geoffrey.
The Lion Air Group General Manager told CNN that the Boeing Maintenance Manual does not provide any instructions to fly the aircraft, even if there is a repeated problem.
"As long as we solve the problem and the technician declares that the aircraft is safe to fly, the pilot will fly the aircraft, because that means that the aircraft is able to fly," said the spokesman. captain Daniel Putut Kuncoro Adi.
The plane was intact when it crashed, according to investigators
The Lion Air flight 610 was intact with its engines running when it crashed at high speed in the Java Sea, Tjahjono announced Monday.
Tjahjono said that because of the small size of the debris found and the loss of aircraft engine blades, investigators determined that the 610 flight had not exploded in the air, but was in "good shape" before his crash 13 minutes after takeoff.
Some of the victims' families aboard the 610 flight were taken Tuesday by boat to the scene of the accident to pray for their loved ones and watch the recovery process in person, said Muhammad Syaugi, director of the company. Indonesian Search and Rescue Agency.
He said his team was still working on locating the cockpit voice recorder (CVR), which he says is buried under deep mud.
After hearing a "ping" from the CVR on Saturday, the teams of divers could no longer hear the signal from the aircraft.
The other black box on the aircraft, the flight data recorder, was found Thursday, and investigators said it showed that Flight 610 had flown 19 flights, including its final flight.
