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Boeing on Wednesday issued a special bulletin addressing a sensor problem reported by Indonesian security officials who were investigating the crash of a 737 Air Lion that had killed 189 people last week.
The planner stated that local aviation officials thought that the aircraft's automated systems may have given erroneous information to the pilots prior to the crash.
"The Indonesian National Committee for Transportation Safety reported that Lion Air flight 610 had been mishandled by one of its AOA (Angle of Attack) sensors," said Boeing.
"Boeing has issued an Operator Manual Bulletin (OMB) asking operators to follow the flight crew procedures in place to remedy situations in which an erroneous input to an AOA sensor is being used. "
An AOA sensor provides data on the angle at which the wind passes over the wings and indicates to pilots the lift of an airplane. The information can be essential to prevent the plane from taking off.
Lion Air JT610 plunged into the Java Sea less than half an hour after leaving Jakarta for a routine flight to the city of Pangkal Pinang. There were no survivors.
The convicted jet was a Boeing 737-Max 8, one of the world's newest and most advanced commercial passenger aircraft, and the cause of the accident remains unresolved. A preliminary report is expected at the end of the month.
Indonesian investigators said Wednesday that the plane had had problems with instruments during four flights, including during a trip where the AOA sensor and the speedometer had been affected. .
Soerjanto Tjahjono, chairman of the Indonesian National Committee for Transportation Safety, told reporters that after a Bali-Jakarta flight – the last flight before the accident -, the left and right sensors of the aircraft, said the report. AOA disagreed by 20 degrees.
He said that the pilot had landed safely in the aircraft on this occasion.
"The pilot's success has become our benchmark to give Boeing a recommendation so that they can give advice to other airlines so that they follow the same procedures if the same situation arises," said Soerjanto. .
He added that the defective Bali-Jakarta flight sensor would be sent to the manufacturer in Chicago for further examination.
"We are also planning to conduct a flight reconstruction to see the impact of the damage to the AOA sensor in Boeing's facility engineering simulator in Seattle."
Research teams who examined the wreck of the JT610 filled 186 funeral bags, but only 44 victims have been identified so far.
Indonesian officials announced on Wednesday that they would extend the three-day search.
The divers have recovered one of the two "black boxes" – the flight data recorder – but are still looking for the voice recorder in the cockpit, in the hope that & # 39; s ######################################################################## It will further clarify the cause of the accident.
The accident has reemerged concerns about Indonesia's poor air safety record, which, until recently, banned its airlines from entering the space of the European Union and the United States.
Lion Air JT610 plunged into the Java Sea less than half an hour after leaving Jakarta for a routine flight to the city of Pangkal Pinang
