Boeing warns after an accident for jet 737 Max

(Bloomberg) – Boeing Co. is about to send a safety warning to operators of its new 737 Max aircraft in response to the investigation of the fatal accident last week off the coast of Indonesia that left 189 dead, one said. person aware of the case.

The Boeing newsletter will warn airlines that incorrect measurements from a flight monitoring system may cause aircraft to come down sharply, said the person who asked not to be identified by discussing details of the manufacturer's plans. Boeing warns pilots to follow an existing procedure to address the problem, the added source.

The warning is based on the preliminary findings of the accident involving a passenger aircraft from Lion Air, the person said. In some circumstances, such as when pilots fly manually, the Maxs will automatically try to lower the nose of the plane if they discover that an aerodynamic block is possible, the person said.

One of the fundamental ways in which an aircraft determines whether a block is imminent is a measure known as the angle of attack, which is a calculation of the angle at which the wind passes over the wings.

The 737 Max 8 from Lion Air sank in the Java Sea on October 29, minutes after takeoff. He had fallen so suddenly that he could have reached speeds of 960 kilometers per hour before crashing into the water. The pilots sent a radio request to return to Jakarta and land, but never returned to the airport, according to the Indonesian National Committee on Transport Safety and the data on flight data. The committee said they were dealing with an incorrect indication of air speed.

& # 39; Necessary measures & # 39;

In a statement published on November 5, the committee asked the US National Transportation and Safety Board and Boeing to "take the necessary measures to prevent similar incidents, particularly in the Boeing 737 Max, a model with 200 aircraft in everyone . "

Although there is no additional information about the bulletin, the warning is the first concrete action that emerges from the investigation into the accident. At the moment Boeing has a procedure with which pilots can continue to fly in the event that the measurements of the attack angle are incorrect.

The Chicago-based aircraft manufacturer supplied 219 Max, the latest and most advanced 737 aircraft, since the new models made their commercial debut last year with a Lion Air subsidiary. Boeing has more than 4,500 orders for those aircraft with larger engines, more aerodynamic wings and an improved cabin with larger glass panels. The family of an aisle plane is the main source of income of Boeing.

Aircraft and engine manufacturers routinely send bulletins to operators where they indicate which safety and maintenance measures they need to take, most of which are relatively routine. But the urgency of a fatal accident can trigger an avalanche of warnings of that type.

Original Note: Boeing Is Said close to Issue 737 Max Warning After Crash (2)

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

Reporters in the original story: Alan Levin in Washington,, Julie Johnsson in Chicago,, Harry Suhartono in Jakarta,

Editors responsible for the original note: Brendan Case,, Bruce Grant,, John Harney

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