Boeing issues advice over sensors after Indonesia crash

Indonesia to probe Lion Air after deadly plane crash

Lion Air jet's airspeed indicator malfunctioned on four flights

The airplane manufacturer said in a statement Wednesday that Indonesia's National Transportation Safety Committee has indicated the crashed Boeing 737 MAX 8 plane had "erroneous input from one of its AOA sensors".

"Lion Air said the problem was fixed, is it true the problem was cleared?" asked Bambang Sukandar, who said his son was on the flight.

But what is disturbing is why Lion Air didn't pull this plane from service after repeated problems.

In a statement November 5, the Indonesian transportation-safety committee called on the U.S. National Transportation and 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".

Indonesian accident investigators said on Monday that an airspeed indicator on the crashed jet was damaged for its last four flights, but USA authorities responded cautiously to suggestions of fleet-wide checks.

With corrections, the difference between the two can be used to calculate airspeed. "One belongs to the pilot in command and one belongs to the co-pilot". Under some circumstances, such as when pilots are manually flying, the Max jets will automatically try to push down the nose if they detect that an aerodynamic stall is possible, the person said.

There are more than 200 Boeing Max jets around the world, with orders for more than 4,700, according to Boeing's website.

If this happens (un-commanded nose-down stabilizer trim) pilots can respond by pushing a switch on their control column (yoke), however, 737's computers will resume trying to dive as soon as the switch is released the new Boeing bulletin said.

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

Boeing's bulletin advises pilots to use existing procedures to recover from such an abrupt dive.

All 189 people on board the Lion Air jet were killed when the plane crashed into the Java Sea on October 29 just minutes after taking off from Jakarta. He did not provide further details about the problem.

Indonesia's National Search and Rescue Agency, Basarnas, said that it had extended the search operations by three days until Wednesday. The agency gleaned the information on the plane's previous trips from the flight data recorder retrieved from the wreckage last week.

Air Marshal Syaugi said some of his divers have been tasked to continue the search as well.

The focus of continuing efforts will be to recover additional victim remains and to locate the CVR, he said.

In a statement on Tuesday, the airline manufacturer said it had issued an "Operations Manual Bulletin" advising airline operators how to address erroneous cockpit readings.

The day before the crash, the Boeing 737 MAX 8 - which had only around 800 flying hours on the clock - had experienced a significant drop in altitude on a flight from Bali to Jakarta, passenger Robbi Gaharu said. "We lost our child, but there was no empathy that Lion Air showed to us". He said the drop felt like falling into "a really, really deep hole".

"We don't know yet where the problem lies, what fix has been done, what their reference books are, what components have been removed", said Nurcahyo Utomo, the KNKT subcommittee head for air accidents.

"The plane disintegrated or broke up after hitting the water, the debris of the plane was found scattered within a 250-metre radius on the sea floor", he said. Syahrul Anto, 48, was reported missing by his diving partner on Friday.

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