Boeing issues safety advice over sensors after fatal Indonesian crash

Boeing to Issue Alert Its Planes Can Abruptly Dive During Flight - Report

Boeing to issue safety warning to pilots for 737 Max jets: Report

The US aerospace giant has issued an "operations manual bulletin" to airlines using the aircraft, telling them how to deal with "erroneous input" from sensors.

The FAA has issued a new airworthiness directive (AD) on the Boeing 737 MAX after Lion Air flight JT610 crash investigators found the aircraft's angle of attack (AOA) sensors are capable of generating erroneous inputs, potentially making the aircraft hard for pilots to control.

Boeing's newly issued bulletin focuses on the 737 MAX's angle-of-attack sensors, or AOA sensors, which are supposed to provide data about the angle at which wind is passing over the airplane's wings.

The news agency noted that angle-of-attack errors can cause pilots to lose control of an aircraft and make it impossible to correct the course of a flight, and this was particularly an issue when jet aircraft were first entering circulation.

"The draft of what will be conveyed by Boeing this morning has been presented to us", air accident investigator Nurcahyo Utomo said.

The bulletin combined with statements by Indonesian investigators to suggest that the pilots on the Lion Air 737 Max 8 were battling the plane as its computers commanded a steep dive during its final moments of flight.

Problems were reported on a Lion Air jet that crashed into the sea off Jakarta even after technicians replaced a sensor on board the aircraft, investigators said.

Under the subject heading, the Boeing bulletin says: "Uncommanded Nose Down Stabilizer Trim Due to Erroneous Angle of Attack (AOA) During Manual Flight Only".

The issue only occurs when a plane's autopilot is switched off, Boeing said.

The plane plummeted into the Java Sea on Oct 29 en route to Pangkal Pinang from Jakarta, killing all 189 aboard.

And in this case the procedure for dealing with the problem it is what is called a "memory item" - pilot's commit them to memory.

"There were four flights in all that suffered a problem with the airspeed indicator", NTSC head Soerjanto Tjahjono told reporters.

Boeing has delivered 219 737 Max jets to customers globally, with 4,564 orders for jets yet to be delivered.

Bloomberg says the plane's velocity was uncharacteristically high, possibly touching speeds of 600 miles an hour as it hit the water.

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.

Boeing has delivered 219 Max planes - the latest and most advanced 737 jets - since the models made their commercial debut a year ago with a Lion Air subsidiary.

Indonesian officials said on Wednesday they would extend the search by three days.

The Lion Air crash is the worst airline disaster in Indonesia since 1997, when 234 people died on a Garuda flight near Medan.

A search for the cockpit voice recorder, the second so-called black box, remains underway.

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