Friday, 16 November, 2018


Boeing issues advice over sensors after Indonesia crash

Lion Air crash Black box reveals plane had airspeed problems on final four flights Crashed Lion Air jet flew four times with damaged airspeed gauge
Bennie Garza | 09 November, 2018, 07:37

The accident came 10 days after Lion Air grabbed headlines when one of its jets plunged into the Java Sea, tragically killing all 189 people on board. The information can be critical in preventing the plane from stalling.

The U.S. plane maker said investigators probing the Lion Air crash off the coast of Indonesia that killed all 189 people aboard found that one of the "angle of attack" sensors on the Boeing 737 MAX aircraft had provided erroneous data.

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. They essentially instruct pilots to use "higher control forces" to overcome the dive-meaning, pull back hard on the controls-but then to disable the automatic trim system and set the trim manually. They chose to fly on to Jakarta at a lower-than-normal altitude.

Batik Air passenger Romidi Karnawan told CNN Indonesia that his flight to Jakarta, which was scheduled to take off at around 6pm, was delayed for about an hour. Its flight crew had requested permission to return to the airport several minutes after taking off.

"The point is that after the AOA [sensor] is replaced the problem is not solved, but the problem might even increase".

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

An Indonesian official said the plane and pilots have been grounded while the crash is investigated.

Southwest and American said operations have not been impacted by the new advisory.

"I would definitely be looking at the man-machine interface and how pilots respond", said Cox, a former airline pilot who flew earlier versions of the 737 and specialized at the NTSB in cockpit actions.

Boeing is involved in the ongoing investigation with the Indonesian National Transportation Safety Committee and other government authorities into the Lion Air crash and "continues to cooperate fully and provide technical assistance".

But Boeing said in its statement Wednesday that it was directing airlines to "existing" flight crew procedures to address angle of attack sensor problems.

He said: "The aircraft nudged the pole while travelling to the runway".

A winglet on the first Boeing 737 MAX airliner is pictured at the company's manufacturing plant in Renton, Washington, on December 8, 2015.

Tempo.co quoted Danang as saying: "Lion Air apologises to all passengers for the inconvenience caused by the incident".

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