FAA: Airlines Need to Heed Boeing Warning After 737 Max Crash

Lion Air crash Black box reveals plane had airspeed problems on final four flights

An AOA - or angle of attack - sensor is a vane that sits outside of the aircraft and gives pilots a visual reading of the plane's angle of attack, or "the angle between the oncoming air or relative wind and a reference line on the airplane or wing", according to Boeing.

A requirement of the airworthiness directive is for operators of the two 737 models concerned to revise the aircraft's flight manual to provide the crew with horizontal stabiliser trim procedures to follow under certain conditions.

Boeing said it is continuing to work with the Indonesian investigation.

Boeing's advisory said the plane experienced "erroneous input from one of its [angle of attack] sensors". It was also Lion Air's first accident since 2004.

Indonesian accident investigators said an airspeed indicator of a Boeing Co 737 MAX plane that crashed last week was damaged for its last four flights, but United States authorities responded cautiously to suggestions of fleet-wide checks.

Indonesia's transport ministry has scheduled a briefing at 3pm in Jakarta on Wednesday to share updated information on the Lion Air accident.

Going forward, Tjahjano said, the KNKT investigators have to recover the cockpit voice recorder to find out what was happening in the last minutes before the plane crashed into the waters.

Boeing warned airlines about the features of the aircraft.

A Lion Air plane has collided with a lamp post at an airport, one week after another of the airline's jets crashed in Indonesia killing 189 people.

Southwest had 23 737 Max 8 in its fleet as of September 30, with nine more to be delivered by the end of the year.

Moments into the aircraft's final flight, the pilots asked to return to Jakarta but never turned back, according to Indonesia's safety commission and flight-tracking data.

"We are formulating, with the NTSB (US National Transportation Safety Board) and Boeing, detailed inspections regarding the airspeed indicator", said Tjahjono, on Tuesday. The device was replaced after pilots reported a problem with the airspeed reading, the Indonesian transportation safety regulator said today.

Bloomberg says the plane's velocity was uncharacteristically high, possibly touching speeds of 600 miles per hour as it hit the water. In addition, a system known as elevator trim can be changed to prompt nose-up or nose-down movement.

But Boeing said in its statement on Wednesday that it was directing airlines to "existing" flight crew procedures to address angle of attack sensor problems. In the early days of the jet age, the pitch trim system was linked to several accidents.

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