3 ms·
> This is how airplanes are made safe. Not by imagining you can create perfect hardware or software, but by assuming any part can fail, and how does the airplan
by fransje26 3y ago
> This is how airplanes are made safe. Not by imagining you can create perfect hardware or software, but by assuming any part can fail, and how does the airplane continue to fly safely?
Boeing disagrees with you.
- WalterBright 3y agoTell me how.
- adamckay 3y agoLikely referring to the 737 MAX crashes which were ultimately caused by cost cutting by Boeing leadership and the assumption using a single sensor was sufficient.
- WalterBright 3y agoThe MCAS system should have looked at two sensors. However, there was a backup: 1. restore trim to normal with the thumb switches 2. turn off the stab trim system. This procedure was followed by the first MCAS incident, and the airplane continued and landed safely. The second incident, the LA crew restored normal trim 25 times, but never turned off the stab trim system and crashed. After that crash, Boeing issued an Emergency Airworthiness Directive, which said to (1) restore trim with the thumb switches and (2) turn off the stab trim system. The third incident, the EA crew turned off the trim system in a steep dive, and crashed. That said, MCAS still should have looked at the 2nd sensor.