Lion Air Jet in Another Accident, a Week After Deadly Crash

Lion Air Jet in Another Accident, a Week After Deadly Crash

American regulators have issued an emergency warning to operators of Boeing's new jet airliner after evidence that a deadly crash in Indonesia last week was caused by the failure of a crucial instrument.

To find out how serious the risks are due to the malfunction of the sensor, the Indonesian investigator would carry out a flight reconstruction in the Boeing facility in the United States.

According to a company statement as of September 30, about a month before the crash, Boeing had 4,783 firm orders from 98 identified customers for the 737 Max.

All 189 people on board were killed and the Indonesian National Transportation Safety Committee has said that flight recorder data has so far revealed the plane's airspeed indicator had not been working properly on its last four journeys, including on the fatal flight.

Jet Airways, which has at least five MAX planes in its fleet, said these planes continue to fly in compliance with the AD issued by the manufacturer and the regulatory authorities.

The Lion Air 737 Max 8 jetliner plunged into the Java Sea minutes after takeoff from Jakarta airport, nosing downward so suddenly that it may have hit speeds of 600 miles an hour before slamming into the water.

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The Boeing 737-900 was on the runway at Fatmawati airport in Indonesia when its wing crashed into a metal post. The malfunction can cause the computers to erroneously detect a mid-flight stall in airflow, triggering a dive to regain speed to keep flying.

The plane is the latest generation of Boeing's workhorse narrowbody aircraft, with more than 200 delivered since it entered service a year ago and a total of 4,700 orders placed by airlines around the world.

The transport ministry said it would launch an immediate investigation.

The directive addresses a potential problem where incorrect angle of attack sensor input can cause the flight control system to send commands to the horizontal stabiliser to push the nose down. The single-aisle family is Boeing's biggest source of profit.

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

If there is an "uncommanded nose-down stabilizer trim" on the Max, pilots can counteract it by pushing a switch on their control yoke. In addition, a system known as elevator trim can be changed to prompt nose-up or nose-down movement. In the early days of the jet age, the pitch trim system was linked to several accidents. That case didn't involve the angle-of-attack system.

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