Boeing Changed Autopilot Switch Functions On 737 MAX | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Recent Daily Episodes

Episode Date

Airborne Unlimited-
Monday

Airborne-Unmanned w/AUVSI-
Tuesday

Airborne Unlimited-
Wednesday

AMA Drone Report-
Thursday

Airborne Unlimited-
Friday

Airborne On ANN

Airborne Unlimited-05.20.19

Airborne UnManned-05.21.19

Airborne Unlimited-05.22.19

AMA Drone Report-05.23.19

Airborne Unlimited-05.24.19

Airborne-YouTube

Airborne Unlimited-05.20.19

Airborne UnManned-05.21.19

Airborne Unlimited-05.22.19

AMA Drone Report-05.23.19

Airborne Unlimited-05.24.19

ANN's AEA 2019 LIVE Coverage Archive: www.airborne-live.net -- Don't Miss It!

Wed, May 15, 2019

Boeing Changed Autopilot Switch Functions On 737 MAX

Former Boeing Flight Control Engineer Says Alterations May Have Contributed To Two Accidents

A change in the function of two cockpit switches in Boeing's 737 MAX airplanes may have contributed to accidents in Indonesia and Ethiopia, according to a former Boeing flight control engineer.

Peter Lemme first called the changes into question on his blog, according to The Seattle Times. Lemme said that a change in the functionality of the switches meant pilots were not able to disable the MCAS on the airplane without also disabling the trim switches on the airplane's yoke.

On previous versions of the 737, the autopilot could be disengaged, but the trim controls would have remained active. One switch deactivated the autopilot, while the other disengaged the yoke trim switches. But on the MAX, both switches performed the same function, disabling both the autopilot and the electronic trim.

Boeing said in a statement that pilots have always been trained to flip both switches to deal with a "runaway" stabilizer, and the change to the MAX matched the established procedure. But the company kept both switches "for commonality of the crew interface. Boeing strongly disagrees with any speculation or suggestion that pilots should deviate from these long-established and trained safety procedures,” Boeing said.

While Lemme questions the change that appears to him to be "change for change's sake", aviation consultant Doug Moss, a former commercial airline pilot qualified in Boeing aircraft, told the paper that the procedure needs to be as simple as possible to prevent confusion in an emergency situation. Asking pilots to flip only one switch rather than both could add an unnecessary level of complexity to the procedure.

Boeing is continuing to work on a software update for the MCAS system on the 737 MAX, and the fleet remains grounded worldwide while that issue is addressed.

(Image from file)

FMI: Source report

Advertisement

More News

Airborne 05.22.19: RedBull Surprise, NASA Lunar Lander, TBM 940

Also: Pilatus PC-24, GAMA 1Q/19 Sales Report, Sikorsky HH-60W, Honda Expands Aerobatic pilot and former US Serviceman Aaron Fitzgerald chose the open space of the Hudson River in N>[...]

AMA Drone Report 05.16.19: FAA Memorandum, Spark 2?, Illegal Anti-Drone Ops?

Also: FAA UAS Symposium, Alpha Electro, Osmo Action Camera, Hummingbird Robot The net has been awash with copies of a memorandum that may foretell the future of the UAS community. >[...]

ANN Social Media Program (ANN-SMP) Expanded For Oshkosh 2019!

ANN Keeps Pushing Aviation Media (Kicking and Screaming) Further Into The 21st Century... ANN is, again, radically updating its social media campaign for the upcoming 2019 Oshkosh >[...]

Don't Miss This! 2019 AirVenture Innovation Preview Is Open To Space Requests

Over Half The Possible Feature Slots For the 2019 AIP Are Already Reserved... DON'T MISS OUT ON THIS? Important Update: The 2019 AirVenture Innovation Preview roster is filling up >[...]

ANNouncement: Now Accepting Applications For Oshkosh 2019 Stringers!!!

An Amazing Experience Awaits The Chosen Few... E-I-C Note: There's very little we can say yet, but there is a reason why this may be a TRULY exciting year to throw in with ANN to c>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2019 Web Development & Design by Pauli Systems, LC