On 5/25/23 13:38, geneb via cctalk wrote:
That wasn't a software problem, that was a criminally cheap management problem - they deleted the comparator for the AoA indexer to save money.
Yes, but probably not Boeing's. AoA disagree was an available option that most /airlines/ explicitly elected not to purchase. Part of the AD was requiring that system, plus limiting MCAS authority so that if you hadn't noticed the trim wheel whacking you in the side of the leg you at least couldn't get into a situation where it would take three people to overpower the combined trim and aeroloading forces, and notably, sim time to review trim runaway procedures. It's not reassuring how many crews got trim runaway wrong in the sim.
AoA disagreement on the B737 is weird anyway. Each AoA sensor drives one half of the cockpit stall avoidance systems, so the way you typically tell that a sensor has failed is when the stick shaker on one side starts going nuts while the other one doesn't.
Honestly, the biggest blame here probably belongs on the doorstep of Southwest.
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