Boeing Releases Emergency Airworthiness Directive on MAX 8

Boeing Releases Emergency Airworthiness Directive on MAX 8. Boeing issued a special report Wednesday on a sensor problem reported by Indonesian security officials investigating the crash of a 737 Air Lion that killed 189 people on 29 Oct 2018. The planner stated that local aviation officials believed that the automated systems of the aircraft could have misinformed the pilots before the accident.

"The National Transport Security Committee of Indonesia reported that Flight 610 of Lion Air was mistreated by one of its AOA (Attack Angle) sensors," said Boeing.

Boeing 737 MAX 8 of Lion Air

Boeing Releases Emergency Airworthiness Directive on MAX 8, pic: Boeing 737 MAX 8 of Lion Air

"Boeing has issued an Operations Manual Bulletin (OMB) requesting operators to follow flight crew procedures to address situations where the wrong AOA sensor input is being used."

An AOA sensor provides data on the angle at which the wind passes over the wings and indicates to the pilots the ascent of an airplane. Information can be essential to prevent the plane from taking off.
Lion Air JT610 sank in the Java Sea less than half an hour after leaving Jakarta to take a routine flight to the city of Pangkal Pinang. There were no survivors.

The plane condemned was a Boeing 737-Max 8, one of the world's newest and most advanced passenger commercial aircraft, and the cause of the accident remains unresolved. A preliminary report is expected at the end of the month.

Indonesian investigators said Wednesday that the aircraft had problems with the instruments during four flights, even on a trip where the AOA sensor and the speedometer were affected. Soerjanto Tjahjono, chairman of Indonesia's National Transportation Safety Committee, told reporters that after a Bali-Jakarta flight, the last flight before the accident, the AOA's left and right sensors did not agree with 20 degrees.

He said the pilot had landed safely on the plane on that occasion. "The success of the pilot has become our point of reference to give Boeing a recommendation so that they can recommend other airlines to follow the same procedures if the same situation arises," said Soerjanto.

He added that the defective Bali-Jakarta flight sensor would be sent to the manufacturer in Chicago for further examination. "We are also planning a flight reconstruction to see the impact of the AOA sensor damage on the Boeing facility engineering simulator in Seattle."

The investigation teams that examined the remains of the JT610 completed 186 burial bags, but to date only 44 victims have been identified. Indonesian officials said on Wednesday they would extend the three-day search.

The divers have recovered one of the two "black boxes", the flight data recorder, but they are still looking for the voice recorder in the cockpit, hoping that this will further clarify the cause of the accident. The accident reoccurred with concerns over Indonesia's poor air safety record, which until recently banned its airlines from entering the European Union and US airspace.