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Boeing shortly before the security warning of 737 max



(Bloomberg) – Boeing Co. is poised to send a security alert to the operators of its new 737 Max jets in response to last week's deadly crash off the Indonesian coast, which left 189 dead, a familiar one Person with the matter.

Boeing's bulletin will alert airlines that erroneous readings from an air traffic control system may cause the aircraft to dive abruptly, said the person who was not asked to discuss details of the manufacturer's plans. The Boeing will warn pilots not to follow an existing procedure to deal with the problem, the person said.

The warning relies on preliminary results of the accident with a Lion Air jet plane, the person said. In certain circumstances, e.g. For example, when pilots fly manually, the max jets automatically try to push the nose down when they realize that aerodynamic stalling is possible, the person said.

A stable is imminent, a measurement called the angle of attack. This is a calculation of the angle at which the wind passes over the wings.

The Lion Air 737 Max 8 plunged into the Java Sea on October 29th after launching and jerking so suddenly down that it can reach speeds of 600 mph before hitting the water. The pilots requested to return to Jakarta for landing, but did not return to the airport, according to the Indonesian National Transportation Safety Committee and the flight data. The committee said it was a faulty airspeed indicator.

The Indonesian Ministry of Transport has scheduled a briefing at 15:00. on Wednesday in Jakarta to provide updated information about the Lion Air accident.

It was not immediately clear if the airspeed problem had any connection with the fishing angle thing. A spokesman for Chicago-based Boeing could not be called immediately for comment.

In a statement issued on November 5, the Indonesian Road Safety Committee called on the United States Transportation and Safety Board and Boeing to "take the necessary steps to prevent this from happening in similar cases." especially with the Boeing 737 Max, which has 200 aircraft worldwide. "The committee tasked with investigating the cause of the crash is scheduled to hold a meeting in Jakarta at 4:00 pm.

While further details of the bulletin are not yet known, the alert is the first concrete measure to emerge from the accident investigation. Boeing has an existing method that allows pilots to continue to fly if their angles of attack measurements become flawed.

The Chicago-based Planemaker has delivered 219 Max, the newest and most advanced 737 jets, since the new models were commercially made debut last year with a Lion Air subsidiary. Boeing has more than 4,500 orders for the Airliners, the larger engines, a more aerodynamic wing and an improved cockpit with larger glass displays have. The single-aisle family represents Boeing's biggest source of revenue.

Aircraft and engine manufacturers regularly send bulletins to operators, who take note of safety measures and maintenance, most of which are relatively routine. However, the urgency of a fatal accident can trigger a flood of such clues.

After an engine on a Southwest Airlines Co. plane killed a passenger over Pennsylvania earlier this year, CFM International Inc. gave CFM56-7B power plants to several of its aircraft operators.

In addition, aviation regulators such as the Federal Aviation Administration and the European Aviation Safety Agency often follow such measures by demanding that airlines comply with bulletins. Director Edward Sirait said: the carrier has not received any bulletins from Boeing.

"We are still focused on treating the families of the victims, including returning their remains to their homes," Sirait said over the phone. "We will leave the accident investigation to the KNKT," he said, referring to the Indonesian Road Safety Committee.

The Indonesian airlines Garuda said they had received no communications from Boeing.

"We will streamline surveillance and inspections and wait for the final report on the investigation," wrote Garuda Indonesia's President, I Gusti Ngurah Askhara Danadiputra, in a text message. "So far there is no interruption in the operation of our Max

The country's emergency services, which searched the sea for the remains of the victims, said Wednesday that the search will be extended for another three days.

Earlier accidents [19659020] Pilots lift and lower the nose of Boeing aircraft by pushing and pulling a yoke in the cockpit, controlling rear controls, known as elevators, and changing a system known as height adjustment to one To induce movement of the nose up or down.

The values ​​of the angle of attack are entered into a computer, which in some cases tries to nose with the elevator to press down trim system. In the early days of the jet age, the elevator trim system was associated with multiple accidents. If the pilots are not careful, they can cause severe down-shift adjustments to the nose, making it impossible to take off an aircraft.

Such a problem occurred at the Rostov-on-Don airport in Russia in 2016, when a FlyDubai 737-800 crashed onto the runway after a preliminary report by Russian investigators. This case did not affect the pitch system. One of the pilots had trimmed the plane to push his nose down after trying to climb after a landing was stopped, the report said. All 62 people died on board.

(Updates with rescue agency expanding the search in paragraph 18.)

– With support from Bret Okeson, Fathiya Dahrul and Tassia Sipahutar.

To contact the reporters on this story: Alan Levin in Washington at alevin24@bloomberg.net; Julie Johnsson in Chicago at jjohnsson@bloomberg.net; Harry Suhartono in Jakarta at hsuhartono@bloomberg.net

To contact the editors responsible for this story: Brendan Case at bcase4 @ bloomberg. network; Bruce Grant at bruceg@bloomberg.net, John Harney

You can find more items of this nature at bloomberg.com

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