[Update] Boeing c̶l̶o̶s̶e̶ ̶t̶o̶ Issued

Caranthir

Boeing Close to Issuing Safety Warning on 737 Max                                ByAlan Levin     andJulie Johnsson                                                November 7, 2018, 9:02 AM GMT+8                        Updated on         November 7, 2018, 9:28 AM GMT+8                    
                                                                                                                                                                                                        
        
                                        The wreckage of an engine from flight JT610.
                        Photographer: Ulet Ifansasti/Getty Images                                                                                                                           
                                    Boeing Co. is preparing to send a bulletin to operators of its new 737 Max models warning that erroneous readings from a flight-monitoring system can cause the planes to aggressively dive, said a person familiar with the matter.
The warning is based on based on preliminary findings from last week’s crash of one of the planes off the coast of Indonesia, said the person, who asked not to be named discussing details that are still confidential. The bulletin, which will be released as early as Wednesday morning Jakarta time, will alert pilots to follow an existing procedure to handle the problem, the person said.
                                Under some circumstances, the Max jets will automatically try to push down the nose if they detect that an aerodynamic stall is possible. One of the critical ways a plane determines if a stall is imminent is a measurement known as angle of attack, which senses the angle at which the wind is passing over the wings.


A family member of the victim of flight JT610 pray at the site of the crash on Nov. 6.

Photographer: Ulet Ifansasti/Getty Images

                A Lion Air 737 Max 8 carrying 189 people dove into the Java Sea at high speed on Oct. 29 minutes after takeoff. The pilots, who were dealing with an erroneous airspeed indication, had radioed a request to return to Jakarta to land, but never turned back toward the airport, according to Indonesia’s National Transportation Safety Committee and flight-track data.



A Boeing 737 Max 7.

Photographer: Simon Dawson/Bloomberg

The action by Boeing is the first indication that pilots were attempting to deal with another problem with the plane. A spokesman for the Chicago-based planemaker couldn’t immediately be reached for comment.

Caranthir

Caranthir

Caranthir

Current 'observation' points to the faulty air sensor which leads to the AoA of the plane to nosedive, to gain "speed" and then altitude.

this autonomous reaction, cannot be override by pilot or copilot. Investigation is still going on.

(this maybe inaccurate) refer #7

Caranthir

Aircraft PL-KQP had strange readings regarding the aircraft's speed & altitude, before the ill-fated flight.

Caranthir

Flight Crew operations manual bulettin for Boeing

kelana36

Caranthir replied at 9-11-2018 06:31 AM
Current 'observation' points to the faulty air sensor which leads to the AoA of the plane to nosediv ...

AoA , Angle of attack sensor yang rosak , stablizer trim yang made the plane nose dive.
AoA sensor sensed that the plane is at very high angle of attack which can result in stalling the plane, so the stablizer trim automatically run to pitch the nose down to unstall padahal the plane is not anywhere near the stall sebab the actual speed actually high .
Boleh recover kalau pilots ikut procedures i.e to CUT OFF the automatic function or stop the trim overun then fly manually . Tapi kalau lambat, at 5000 feet above the sea, memang tak banyak room for error la..

Caranthir

kelana36 replied at 9-11-2018 11:47 AM
AoA , Angle of attack sensor yang rosak , stablizer trim yang made the plane nose dive.
AoA senso ...

ya.. sorry my bad.. suda mixed everything around..