Boeing warns airlines about equipment failure after Indonesia crash

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Boeing said it had issued an "Operations Manual Bulletin" addressing flight crew procedures in cases where there is "erroneous input from an [Angle of Attack] sensor".

The US Federal Aviation Administration has issued an emergency airworthiness directive for the Boeing 737 MAX 8 and MAX 9 after one crashed in Indonesia last month killing all 189 people on board.

Signs appear to point to an instrument failure in the brand-new Boeing 737 Max, specifically the angle-of-attack sensor, which is critical to determining the amount of lift generated by the wings.

Representatives of 737 Max operators, Singapore Airlines offshoot SilkAir, Garuda Indonesia and Canada's WestJet, said they had not yet received a bulletin from Boeing, Reuters reports.

Lion Air said in a statement: "The Boeing 737-900ER registered PK-LGY which was due to take off at 18.20 from Bengkulu, the departure was cancelled".

The alert came after Boeing Co said in a statement that it had alerted pilots to the issue. Following the protocol should be routine for well-trained pilots, though may be more challenging in the heat of the moment when equipment is malfunctioning and alarms are sounding.

The directive gives regulatory weight to Boeing's safety bulletin that it sent to operators of Boeing 737 MAX 8 and MAX 9 planes based on findings from the ongoing Indonesian investigation into the October 29 crash of a Lion Air jet.

The KNKT has interviewed crew and technicians on duty for two previous flights, while also retrieving the faulty sensor from Bali for inspection.

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Aircraft and engine manufacturers routinely send bulletins to air carriers noting safety measures and maintenance actions they should take.

"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", the warning said. However, in rare instances, accidents have been caused by what investigators call a "startle factor".

Based on the preliminary data recovered from the wreckage of PK-LQP (msn 43000), the DJPU said that the aircraft's airspeed indicator malfunctioned during four flights prior to the doomed flight JT610 from Jakarta Soekarno-Hatta to Pangkalpinang.

Data from the black box of the Lion Air 737 Max that fell into the sea with 189 people onboard has confirmed there was an issue with the plane's airspeed indicator.

The transport ministry said it would launch an immediate investigation.

A Lion Air plane, which was carrying 145 passengers, was forced to abort its take-off after its left wing crashed into a pole.

The airline said at the time that it had 61 "firm orders" for the planes.

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