PPRuNe Forums - View Single Post - Boeing 737 Max Software Fixes Due to Lion Air Crash Delayed
Old 18th Feb 2019, 03:41
  #86 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
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Salute!

Problem,@ Jim in Texas, is the fatal crew had the stick shaker and other bells and whisltes from WoW. It looks to me from the FCOM that the shaker( one side, if we read the logic correctly) would have kept shaking even if they had disabled the trim using those pedalstal switches. Also seems that the other side should not have the shaker going. I can see how the crew is getting confused.

This is getting beyond something simple like dual engine failure that Sully and Skiles had to deal with compared to this scenario.

There;s a lotta difference between classic runaway trim where the sucker keeps a continuous trim in one direction and the MCAS intermittent trim mechanization. It's especially hard to deal with a new "anomaly" if a "new" installed gizmo is not carefully briefed and the folks that implemented it have not thot of a single point failure as we saw in 610, and possibly the previous flight.

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