Lion Air: Black box report faults Indonesian airline's safety measures in crash

Lion Air: Black box report faults Indonesian airline's safety measures in crash

Lion Air: Black box report faults Indonesian airline's safety measures in crash

However according to an investigation by Indonesia's national transport committee (KNKT) the flight suffered the same technical issues the day before it crashed, and was not fit to fly.

Indonesian investigators said Wednesday that a faulty angle-of-attack indicator on a Lion Air Boeing 737 MAX 8 wasn't replaced or repaired prior to the October 29 crash into the Java Sea that killed all 189 people aboard.

The preliminary report does not assign responsibility for the crash but confirms that it occurred after faulty measurements of airflow by instruments mounted on the wings...

MR NURCAHYO UTOMO, sub-committee head for air accidents at Indonesia's National Transport Safety Committee. Mechanics, however, did not check sensors that measure whether the nose of the plane is pointing up or down.

"Even if the pilot did not have time to meet with the engineer, he should be able to know what the problems experienced by the aircraft before, " Utomo said.

The investigators are focusing on whether faulty information from sensors led the plane's system to force the nose down.

After the crash, Lion Air instructed pilots to provide a "full comprehensive description" of technical defects to the engineering team, the KNKT said.

Investigators say it is too early to conclude what caused the crash.

Investigators did not definitively say what they believe caused the aircraft to crash, with a crash report expected next year.

The report provided new recommendations to Lion Air on safety on top of earlier recommendations about the flight manual that have already been implemented by Boeing.

They ask the arrivals controller to block the air space 3,000 ft above and below them so they can avoid other traffic.

Pilots flying the same plane a day earlier had experienced a similar problem until they used switches to shut off the system, KNKT said in its statement today.

"The plane was no longer airworthy and it should not have kept" flying, he added. The captain was using his controls to bring the airline's nose up, but an automated anti-stall system was pushing it down.

After the aircraft's flaps retracted following takeoff, the automatic trim problem noted on the previous night's flight returned, until the flight data recorder stopped recording when the plane crashed.

Boeing has said that "the 737 Max is as safe as any airplane that has ever flown in the skies" and that "the appropriate procedure to address unintended horizontal stabiliser movement" is contained in the relevant flight manuals. The tragedy was the first involving Boeing's latest model of the 737 series, 737 MAX, which entered service a year ago.

Lemme described "a deadly game of tag" in which the plane pointed down, the pilots countered by manually aiming the nose higher, only for the sequence to repeat about five seconds later.

Lemme said he was troubled that there weren't easy checks to see if sensor information was correct, that the crew of the fatal flight apparently wasn't warned about the problems on previous flights and that the Lion Air jet wasn't fully repaired after those flights.

The doomed plane's flight data recorder showed that pilots had repeatedly tried to correct its nose from pointing down, possibly after erroneous data from AoA sensors was fed into a system that automatically adjusts some of its movements.

The findings will heighten concerns there were problems with key systems in one of the world's newest and most advanced commercial passenger planes.

U.S. aviation groups, including the Federal Aviation Authority, say Boeing didn't tell them about new sensors in the automated anti-stall system that were added to their 737 MAX aircraft.

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