Boeing issues operational manual to airlines following Lion Air crash

An official from Indonesia's transportation safety agency examines a turbine engine from the crashed Lion Air plane

An official from Indonesia's transportation safety agency examines a turbine engine from the crashed Lion Air plane

"When we opened the black box, yes indeed the technical problem was the airspeed or the speed of the plane", head of Indonesia's National Transportation Safety Committee Soerjanto Tjahjono said, according to The Guardian. The information can be critical in preventing the plane from stalling.

After an engine on a Southwest Airlines plane fractured earlier this year over Pennsylvania, killing a passenger, CFM International issued multiple bulletins to operators of its CFM56-7B power plants. The US manufacturer has delivered 219 737 MAX jets to customers globally.

Aircraft and engine manufacturers routinely send bulletins to operators noting safety measures and maintenance actions they should take, majority relatively routine.

The Wall Street Journal reported that USA aviation regulators also meant to issue safety warnings about potentially suspect flight-control software.

The bulletin is being prepared based on preliminary findings from the crash of one of the planes off the coast of Indonesia, said the person, who asked not to be named discussing the inquiry.

A spokeswoman for Boeing in Singapore declined to comment.

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. The committee said the pilots were dealing with an erroneous airspeed indication.

To avoid having the problem repeat, pilots may deactivate the stabilizer trim system, according to The Air Current's explanation. There are three separate systems to calculate speed and altitude, and there are a variety of measures pilots can take when speed readings become unreliable.

The suggestion that the Lion Air plane had a defective airspeed indicator is a significant development.

Boeing will also warn pilots to follow an existing procedure to handle the problem.

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"When there was a problem, the pilot would write it down and the mechanic would do (a repair).Then the plane would be declared airworthy".

What do we know about the final flight? The cockpit voice recorder has not been located.

Both flights crashed shortly after takeoff.

"Intermittent failures are very hard for maintenance personnel to trouble-shoot because a lot of times they just say, 'Cannot duplicate, ' and they write it up that way", Diehl said.

There are also procedures for pilots to follow in the event of missing data from damaged sensors on the fuselage skin, but it remains unclear how much time the crew of flight JT610 had to respond at the relatively low level at which they were flying.

Even with modern Global Positioning System tracking, planes need to calculate their precise speed through the air. This angle between the wing and the oncoming airflow is called the "Angle of Attack" (AOA).

By comparing that pressure against the ambient air pressure obtained from what are known as static ports, the aircraft can determine airspeed.

Modern jetliners have redundant measurements to help pilots spot and disregard a single reading that looks unlikely and possibly erroneous. (AAP) Attendees wept and prayed as search crews continued to recover debris from the surrounding waters.

Relatives questioned why the two-month-old Boeing 737 MAX 8 plane had been cleared to fly after suffering problems on a previous flight Sunday from Bali to Jakarta. Neither of the faults appeared related to the accident.

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. "The engines were still running at high RPM".

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