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A US aviation regulator intends to require airlines to comply with an opinion issued by Boeing Co. on how pilots should handle erroneous readings from an aircraft sensor that, according to the authorities, occurred on a 737 MAX jet plane that crashed off the Indonesian coast last week.
The Federal Aviation Administration on Wednesday issued a statement in which it announced its intention to issue an Airworthiness Directive on the problem and "take appropriate action based on the results of the investigation". The FAA has also briefed other regulators around the world, who generally follow the US Agency for Security.
The operating manual bulletin was released Tuesday, said Boeing in a statement posted on Twitter, and urges flight crews to use existing guidelines to deal with the erroneous information provided by the angle sensor. # 39; attack. This sensor is designed to maintain the flow of air over the wings of an aircraft, but if it does not work properly, the computers of the aircraft may mistakenly think that it is in an aerodynamic stall, which can cause a steep dive of the plane.
Earlier, Bloomberg News reported that Boeing was preparing to alert operators of the 737 MAX jet in response to the investigation into the Lion Air crash on October 29, which killed 189 people.
The newsletter is based on preliminary findings of the Lion Air disaster. Under certain circumstances, such as when pilots fly manually, MAX jets will automatically try to stoop if they detect that aerodynamic stall is possible, said someone familiar with the subject. One of the critical ways that an airplane determines if a stall is imminent is the angle of attack measurement.
Boeing shares rose less than 1% to $ 368.11 in pre-market transactions on Wednesday in New York. The title had climbed 24% this year until Tuesday.
The last dive of Lion Air Jet could have reached 600 miles at the hour
Moments after takeoff from Jakarta airport, the airliner Lion Air 737 MAX 8 plunged into the Java Sea, plunging so low that it may have reached a speed of 100 km / hr before crushing in the water. Moments earlier, the pilots radioed a request to return to Jakarta to land, but never turned back to the airport, according to the Indonesian National Committee for Transportation Safety and Trajectory Data. flight. The committee stated that the pilots had an incorrect speed indication.
The investigation into what happened with the aircraft Lion Air "is ongoing and Boeing continues to cooperate fully and provide technical assistance at the request and under the direction of government authorities investigating the accident, "said the company in its statement.
The crash of Lion Air Jet had erroneous readings on the last 4 flights
The jet reported a divergence in its angle of attack sensor during a flight between Bali and Jakarta, the day before his accident. The aircraft was replaced in Bali after the pilots reported a speed reading problem, the Indonesian Transportation Safety Authority said on Wednesday.
Boeing has delivered 219 MAX aircraft – the latest and most advanced of the 737 – since the commercial launch of these models last year with a subsidiary of Lion Air. Boeing has more than 4,500 orders for airliners, which include larger engines, more aerodynamic wings and an improved cockpit with larger glass screens. The single aisle family is Boeing's biggest source of profit.
Aircraft and engine manufacturers regularly send air carriers bulletins indicating the safety measures and maintenance measures they must take, most of them being relatively routine. But the urgency of a fatal accident can trigger an avalanche of opinion of this type.
After breaking a Southwest Airlines Co. aircraft engine earlier this year over Pennsylvania, killing a passenger, CFM International Inc. issued several newsletters for CFM56 operators 7B.
Aviation regulators, such as the FAA and the European Aviation Safety Agency, often follow such measures by obliging carriers to follow bulletins.
The pilots raise and lower the nose of the Boeing airliners by pushing and pulling a yoke into the cockpit, which controls the panels at the tail, called elevators. In addition, a system known as elevator compensation can be modified to allow a rapid nose-up or nose-down movement.
The angle of attack readings are introduced into a computer which in some cases will attempt to push the nose using the elevator compensation system. At the beginning of the jet era, the lift compensation system was linked to several accidents. If the pilots are not careful, they can cause severe dive compensation settings that make it impossible to upgrade an aircraft.
Such a problem occurred in 2016 at the airport of Rostov-on-Don, Russia, when a FlyDubai 737-800 nosed and crashed against the runway, according to a provisional report of the Russian investigators. This case did not involve the angle of attack system. One of the pilots had cut the aircraft to lower the nose while trying to get on after stopping a landing, the paper said. The 62 people on board died.
