U.S. issues emergency safety directive on Boeing 737 after Lion Air crash

Crashed Lion Air jet flew four times with damaged airspeed gauge

Aerospace and defense giant Boeing is planning to issue a safety warning to people flying its 737 Max jet, Bloomberg reported on Tuesday.

Safety investigators said that pilots on the plane were dealing with inaccurate airspeed readings and asked to return to the airport just before the crash.

One of the critical ways a plane determines if a stall is imminent is a measurement known as angle of attack, which is a calculation of the angle at which the wind is passing over the wings.

"This condition, if not addressed, could cause the flightcrew to have difficulty controlling the airplane, and lead to excessive nose-down attitude, significant altitude loss, and possible impact with terrain".

This latest incident came just over a week after a Lion Air plane crashed into the Java Sea on October 29, killing everyone on board, prompting the Indonesian Transport Ministry to conduct a special investigation into the airline.

The two-month-old plane went into a sudden dive minutes after take-off, which the pilots were able to recover from.

Data from the black box of the Lion Air 737 Max that fell into the sea with 189 people on board has confirmed there was an issue with the plane's airspeed indicator.

In its safety warning to airlines on Wednesday, Boeing directed them to existing flight crew procedures to address issues with erroneous input from an AOA sensor.

A Boeing 737-900 plane belonging to the low-priced flight operator from Indonesia has been grounded at the Fatmawati airport in Bengkulu, Indonesia, after hitting an electricity pole before takeoff.

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

Boeing says in the bulletin that if this failure arises, "initially, higher control forces may be needed to overcome any nose-down stabilizer trim".

The DGCA had reviewed the performance of Boeing 737 MAX 8 planes operated by Jet Airways and SpiceJet.

As details have trickled out following the tragic Lion Air Flight 610 crash in Indonesia last week, one thing has become clear: the crew likely had an unbelievably confusing and desperate situation on their hands.

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". Boeing released a bulletin about the issue on November 6. Boeing has more than 4,500 orders for the airliners, which feature larger engines, more aerodynamic wings and an upgraded cockpit with larger glass displays.

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