Boeing withheld information on mannequin of aircraft concerned in Indonesia crash, pilot group says


The Allied Pilots Affiliation rejected Boeing’s assertion {that a} security bulletin issued final week was meant to strengthen procedures already within the 737 MAX flight handbook.

“They (Boeing) did not present us all the data we depend on after we fly an plane,” mentioned Captain Dennis Tajer, a spokesman for the group. “The bulletin just isn’t re-affirming, it is enlightening and including new information.”

The handbook didn’t inform pilots that, when the aircraft’s laptop detects the plane is in a stall, it robotically triggers a response, comparable to decreasing the airpane’s nostril, to stop or exit the stall.

That’s important info for pilots, which the affiliation says was by no means communicated to them.

The Allied Pilots Affiliation says whereas there are not any rapid security issues concerning the Boeing 737 MAX “the truth that this hasn’t been advised to pilots earlier than calls into query what different information ought to we find out about this plane.”

The information was first reported by the Wall Street Journal (WSJ).

The Federal Aviation Administration (FAA) mentioned it had no new touch upon the matter.

Citing “security specialists concerned within the investigation, in addition to midlevel FAA officers and airline pilots,” the WSJ reported Monday that the automated stall-prevention system on Boeing 737 MAX eight and MAX 9 fashions — supposed to assist cockpit crews keep away from mistakenly elevating a aircraft’s nostril dangerously excessive — “below uncommon situations can push it down unexpectedly and so strongly that flight crews cannot pull it again up.”

In response to the WSJ, Boeing advised airways that such a state of affairs “may end up in a steep dive or crash — even when pilots are manually flying the jetliner and do not count on flight-control computer systems to kick in.”

Captain Daniel Putut Kuncoro Adi, Managing Director of Lion Air Group, advised CNN Wednesday that the airline is “accumulating all info in our inside investigation, we have been working with our specialists in (operations and engineering) departments, however once more we do respect the investigation course of achieved by (Indonesian security inspectors), and we sit up for the report.”

Challenge with AOA sensors

Boeing launched an operational bulletin last week, warning all airways about tips on how to tackle any misguided readings associated to the angle of assault (AOA) sensors. The Federal Aviation Administration (FAA) later issued its personal directive that suggested pilots about how to reply to related issues.

An AOA sensor is an instrument, much like a small wind vane, that sits outdoors the aircraft slightly below the cockpit and sends info to its computer systems concerning the angle of the aircraft’s nostril relative to the oncoming air. The sensor helps to find out whether or not the aircraft is about to stall and dive.

Boeing mentioned the operational bulletin pointed crews to “present flight crew procedures to deal with circumstances the place there may be misguided enter” from the sensors concerned within the Indonesia incident, the AOA sensors.

In an announcement following the WSJ report, Boeing mentioned: “We’re taking each measure to totally perceive all elements of this incident, working intently with the investigating group and all regulatory authorities concerned.”

“We’re assured within the security of the 737 MAX. Security stays our high precedence and is a core worth for everybody at Boeing,” the corporate mentioned.

“What appears to have occurred right here is {that a} new model or a modified anti-stall capability was added which pushes the nostril down robotically. If it is true, it’s past comprehension that Boeing didn’t inform the airline and pilots about this,” mentioned CNN aviation correspondent Richard Quest.

He added that if vital info hadn’t been communicated to pilots, it will be a matter for aviation regulators, reasonably than particular person airways.

“The problem is how a lot info to present the pilots concerning the techniques on board to allow them to reply in an emergency,” Quest mentioned, including that pilots are sometimes overloaded with readouts and indicators from a number of units and screens that may danger distracting them on the worst doable second.

Lion Air sensor changed

Final week, investigators engaged on the Lion Air Flight 610 crash — during which 189 folks died — mentioned the AOA sensor on board the aircraft had been replaced the day before the incident, however issues endured.

Indonesian authorities confirmed final Wednesday that the AOA sensor was changed after a flight from Manado, in North Sulawesi, to Denpasar, Bali, on October 28. The Boeing 737 MAX eight then made one other flight to Jakarta that very same day, and the pilots reported additional issues.

Investigators mentioned the jet skilled issues on its final 4 flights — together with, crucially, the flight that crashed, based on Soerjanto Tjahjono, the top of the Nationwide Transportation Security Committee (KNKT).

Seek for voice recorder

Greater than three weeks after the crash, authorities are nonetheless trying to find the aircraft’s cockpit voice recorder (CVR), which is believed to be buried below deep mud. If discovered, it ought to reveal what occurred within the cockpit within the ultimate seconds of the flight.

Investigators are already examining the flight data recorder (FDR) that was pulled off the sea bed, some 30 meters below water, on November 1. Preliminary findings steered there have been issues with the air pace indicator on the previous three flights earlier than the crash.

The airspeed indicator is sort of a speedometer and tells the pilot how briskly the aircraft is shifting by means of the air. It does this by gathering information from the aircraft’s pitot tube and the static port, which primarily evaluate differentials within the air strain to reach on the aircraft’s pace and the altitude.

After issues have been reported with the air pace indicator, the AOA sensor was changed by a Lion Air technician in Bali earlier than the aircraft departed for Jakarta on its penultimate flight.

Passengers on that flight advised CNN that the aircraft skilled a big drop in altitude shortly after takeoff. “After 10 minutes within the air the aircraft dropped as if it was dropping energy. Folks panicked. It dropped about 400 ft,” passenger Robbi Gaharu said.

As soon as in Jakarta, a Lion Air technician checked the aircraft once more and gave it the inexperienced mild to fly on its ultimate flight, from Jakarta to Pangkal Pinang.

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