Responding to the Lion Air jetliner crash that killed 189 people in Indonesia last week, manufacturer Boeing Co. BA 1.24%…
Responding to the Lion Air jetliner crash that killed 189 people in Indonesia last week, manufacturer
and U.S. Aviation Regulators intend to issue twin safety warnings about potentially suspected flight control software that can confuse pilots and lead to a steep descent of the affected aircraft model, according to people familiar with the matter.
The moves are the first public indication that investigators suspect a possible software glitch or misinterpretation by pilots-related to an essential system that measures how high or low a plane’s nose is pointed-may have played an important part in the sequence of events that caused the Boeing 737 Max 8 to plunge into the Java Sea.
Incorrect data about the angle of the plane can lead to a cascade of warnings and warnings that can be misinterpreted by pilots when they are flying manually, as security systems automatically adjust flight-control surfaces to push the nose of The plane downward, these people said.
The anticipated actions by Boeing and the US Federal Aviation Administration is preliminary, these people said, and are expected to stop short of urging or mandating replacement or inspection of any specific onboard system. Rather, they amount to a official red flag for pilots, highlighting potential hazards from the interaction of certain software with various other cockpit alerts, and reiterating the importance of following standard procedures under such circumstances.
In the wake of previous crashes in som pilotfeil eller forvirring var bidragende faktorer, fabrikanter og FAA har udstedt sikkerhedsadvarsler som reiterer grænsene for visse luftfartssystemer og betydningen av piloteres som følger anbefalte prosedyrer.
I dette tilfelle, ifølge en av folks kjent med matter, the aim is similarly to emphasize the importance of following standard flight-deck procedures, so pilots avoid misunderstanding or improperly reacting to certain cockpit displays or alerts when manually flying the aircraft.
The crew of Lion Air Flight 61
0 reverted to manual flight After experiencing unreliable airspeed indications shortly after takeoff from Jakarta in good w eather, according to preliminary information gathered by the investigation. Minuten na de bemanning communiceerde de situatie aan luchtverkeersbeheerders en kreeg geleidelijk de hoogte als onderdeel van een duidelijke inspanning om het probleem te oplossen, de twin-engine vliegtuig plunged in het water bij hoge snelheid.
med det som hedder det angle-of-attack indicator system, de advarsler ikke eksplicit link dette system til årsaken til oktober. 29 accident.
Airline and FAA safety experts have not identified a previous pattern of similar software issues in the fleet, according to safety experts familiar with the details. Men foreløbige data fra ulykken antyder at angrepsangrebene kan ha malfunksjoned for noen grunn, potensielt forvirrende crew om flyets hastighet og holdning, ifølge en person som er informert om problemet. Investigators have not publicly described such a scenario.
As early as Tuesday evening, according to the people familiar with the matter, the Chicago-based plane maker was expected to issue an operation bulletin to all airlines flying 737 Max 8 variants.
Within hours, FAA officials are prepared to issue a complementary follow-up safety document raising basically the same issues, these people said. The emergency airworthiness Directive will be binding on all US carriers flying Boeing 737 Max 8 versions and is expected to be embraced by regulators worldwide.
Just a day earlier, industry and government officials were not expecting such rapid action. But clues recently downloaded from the plane’s flight data recorder apparently were worrisome enough to prompt Boeing and the FAA to move quickly into drafting and coordinating the pair of safety warnings.
More broadly, investigators are trying to understand why the last four flights of the crashed Lion Air jet all experienced problems with the new Boeing’s airspeed indicator, and how interaction between such faulty readings and software associated with the other system could have led to the accident.
-Andrew Tangel contributed to this article.  Write to Andy Pasztor at [email protected]