FAA Issues Boeing 737 AOA Directive After Lion Air Crash

Jeannie Matthews
November 9, 2018

The warning prompted the US Federal Aviation Administration to issue its own emergency airworthiness directive, telling airlines with Boeing 737 Max 8 aircraft to follow correct procedures if pilots receive erroneous information from an AOA sensor.

Boeing Co. said on Wednesday it had issued a safety bulletin reminding pilots how to handle erroneous data from a key sensor in the wake of last week's crash in Indonesia.

That sensor is meant to maintain air flow over a plane's wings but if it malfunctions it can cause the plane's computers to erroneously think it is in a aerodynamic stall - which can then cause aircraft to abruptly dive.

The Lion Air flight with 189 people on board crashed into the sea off Jakarta's coast October 29, marking the first crash involving the Boeing 737 Max 8 aircraft.

Indonesia's National Transportation Safety Committee earlier this week announced the plane had a malfunctioning airspeed indicator on its last four flights, based on analysis of the flight data recorder.

Lion Air JT610 plunged into the Java Sea less than half an hour after taking off from Jakarta on a flight to Pangkal Pinang city.

Ocasio-Cortez becomes youngest woman elected to Congress
In rapid succession, the House got its first two Muslim women: Minnesota's Ilhan Omar and Michigan's Rashida Tlaib . Kansas' Sharice Davids and New Mexico's Deb Haaland are the country's first Native American congresswomen.

Ariana Grande: Could she have a secret album out there?
Not surprisingly, she elides the song's chorus "I'm so f-ing grateful for my ex" to "I'm so, I'm so grateful" on " Ellen ". What we love most about this video is that Ariana could have totally redone the whole thing, but chose not to.

Now you can wear National Football League uniforms in Fortnite
One of the main reasons the game has been such a resounding success is the innovation of Epic Games, the company behind Fortnite . To help speed up the process of getting geared up and ready for battle, farming resources have been increased by 75 percent.

After safety officials from Basarnas, Indonesia's national search and rescue agency, retrieved the aircraft's flight data recorder (FDR), a review of the data by Boeing and Indonesian safety investigators pointed to the plausible cause of the crash. The only way to prevent this, is for the pilot to intervene and manually deactivate the system.

Chairman Soerjanto Tjahjono said the airspeed indicator and sensor problems were related.

"A "ping" has been detected from the second black box but the signal was very weak, possibly because it was encased in mud", said Nurcahyo Utomo, an air accident official at the transportation safety committee (KNKT).

Boeing has signalled there could be a problem with the flight control system of its 737 Max 8 jet after one of the new airliners crashed, killing 189 passengers.

The airline said at the time that it had 61 "firm orders" for the planes.

The FAA said the "erroneous inputs can potentially make the horizontal stabilisers repeatedly pitch the nose of the airplane downward, making the aircraft hard to control". That failure caused the aircraft's systems to think the airplane was in danger of stalling, causing the computer to steadily adjust the trim tabs on the horizontal stabilizer to nose the aircraft downward, thereby picking up speed. That is enough to send the plane out of control and cause it to fall to the ground. Once that happens, it may try to right itself by pushing the nose down, reports the Straight Times. There were more than 180 people on board.

Other reports by

Discuss This Article

FOLLOW OUR NEWSPAPER