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FAA issues 737 MAX emergency AD

08 November 2018
FAA issues 737 MAX emergency AD

Soerjanto Tjahjono, chairman of the National Transport Safety Committee, told media that that airspeed indicator malfunctions on the jet's last four flights, and that this issue was intertwined with the AOA sensor issue.

That angle-of-attack sensor is meant to measure the direction of air flow over wings so that they maintain lift.

Black box data recovered from the crashed Lion Air jet showed the plane had an airspeed indicator problem on its four flights.

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

The damage to the device, which tells pilots how fast their planes are travelling, was revealed after the recovery of a "black box" recorder.

The body asked the U.S. National Transportation Safety Board "and Boeing to take necessary steps to prevent similar incidents, especially on the Boeing 737 Max, which number 200 aircraft all over the world", it said in the statement.

Boeing has signalled there could be a problem with the flight control system of its 737 Max 8 jet after one of the new airliners crashed, killing 189 passengers.

The captain and first officer flying from Bali to Jakarta the night before the crash had indicators displaying differences in angle of 20 degrees, KNKT said, but that flight landed safely despite the issues in the air.

It is understood that the download process started yesterday and it is hoped that clues may emerge quickly as to what systems were not functioning on the near-new plane.

Boeing did not immediately respond to a request for comment. Of course, this is something they already overwhelmingly do, as we can see from the generally incredible recent safety record in global aviation, but clearly something went very wrong here that shouldn't have.

This measures at what angle an aircraft is flying and air is passing over the wings. The advice from the Federal Aviation Authority would be binding on all United States carriers flying Boeing 737 Max 8 versions.

At a meeting on Monday, to address the grieving families of the victims, Tjahjono said that the plane did not explode mid-air and was intact when it plunged into the sea, with its engine's turbines running at high speed.

Air Canada announced last December that its 737 Max aircraft had just started operating and was carrying passengers between Vancouver, Calgary, Edmonton, Toronto and Montreal.

Indonesia's National Search and Rescue Agency (Basarnas) chief Muhammad Syaugi told reporters yesterday morning: "We made a decision to extend our evacuation operation by another three days, specifically for Basarnas".

The bulletin is based on preliminary findings from the Lion Air disaster.

Meanwhile, divers continued to search for the aircraft's missing cockpit voice recorder, or "black box", which could help investigators piece together the doomed flight's final moments.

There are audio signals and physical warnings that can alert the pilot to malfunctioning equipment or other dangers, said Todd Curtis, director of the Airsafe.com Foundation.

Boeing is now warning pilots that if they experience inaccurate or erroneous readings from the sensor to follow standard flight procedures, though it's not clear what those are.