United States aviation safety experts and pilots associations say Boeing didn't tell them about a new flight-control system on 737 MAX aircraft, a sensor which Indonesian officials think could be involved in the deadly Lion Air crash.
The system pushes the nose of the aircraft down when a device called the Angle of Attack (AOA) sensor, which is on the outside of the plane, feels the aircraft is facing up too much which could make it stall. MCAS intervenes at a threshold angle of attack and automatically trims nose down at a rate of 0.27 degrees per second to a maximum of 2.5 degrees.
A United spokesman said Tuesday night: "We have received the bulletin from Boeing and directives from FAA and are complying".
Boeing has said it is fully cooperating with any reviews and conducting its own investigation of the Lion Air crash.
"[Syari] said: 'We were supposed to do this together, there's supposed to be Rio here'".
Boeing sells the single-aisle Boeing 737 aircraft in two versions, the classic Boeing 737 NG and the new generation Boeing 737 MAX. American, the world's largest airline, has outstanding orders for 85 of the planes. "The bottom line here is the 737 MAX is safe and safety is a core value for us... we ensure that airplanes are safe". A technical issue that Boeing flagged in a safety warning after the deadly 737 MAX 8 crash in Indonesia could happen to any other aircraft, and it's "not unlikely" that the manufacturer knew about it, aviation experts told RT. Still, the response from regulators and pilot representatives hints at a broader reckoning in the commercial aerospace industry over one of Boeing's marquee jets, the 737 MAX8.
Boeing and regulators have underscored the steps pilot can take to disable the pitch-trim system, as it's known, in bulletins to 737 Max operators over the past week.
Intan Syari's fiance, Dr. Rio Nanda Pratama, was among 189 people who were killed when the Boeing 737 crashed October 29 shortly after taking off from Jakarta. The FAA ordered airlines to add an explanation into flight manuals.
Boeing will need to deliver 72 of the single-aisle planes in November as well as in December to reach its planned build rate, Bloomberg Intelligence analyst George Ferguson told clients in a report.
"As we have previously said, we have issued an (airworthiness directive) and will continue to take appropriate action based on what we learn from the investigation".
Soerjanto Tjahjono, the head of Indonesia's National Transportation Safety Committee, said Boeing's manual, which was used by carriers worldwide to instruct pilots on how to fly the Max 8, did not adequately describe how this automatic anti-stall system worked and what to do if it was triggered incorrectly.