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Very Hot Topic (More than 25 Replies) Boeing 737-MAX 8 (Read 602 times)
Justin B.
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Re: Boeing 737-MAX 8
Reply #30 - 04/07/19 at 18:02:36
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Dang.  They have to crank the hell out of the trime?  Why can't they just pull back on the yoke after turning the thing off?  I think maybe Trump's right, planes are getting too complicated!

The planes I worked around in the Army had cables running to the control surfaces...
  

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Bob_Roller
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Re: Boeing 737-MAX 8
Reply #31 - 04/07/19 at 18:52:50
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There are two cables that run the length of the fuselage back to the jackscrew in the aft ' hell hole ', the trim wheel is conneced to a cable drum below the control cabin, there is a chain drive system to connect the trim wheel in the control cabin, to the cable drum below the control cabin .

Yeah, it's a pretty lousy system .

Here's a video that shows a quick view of the cable drum  on the jackscrew actuator, there is a similar cable drum just under the control cabin .

https://www.youtube.com/watch?v=J7l_DSj6zUo
  

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Justin B.
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Re: Boeing 737-MAX 8
Reply #32 - 04/08/19 at 11:08:41
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Man, that's one long a$$ cable!
  

Justin B.

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Tony Smith
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Re: Boeing 737-MAX 8
Reply #33 - 04/08/19 at 16:37:30
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My flying days, such as they were, are over. The aircraft i flew had round dials, controls moved )mostly) by cables and rods, and the only "computer' on-board was between my ears. But, I must admit that this is personal prejudice and some of the aircraft types I flew had nasty reputations -e.g. Piper Aerostars and Beech singles (aka "forked tail doctor killers").

The point of this drivel -I flew an number of aircraft that had electric trim. After the first time I had one run  away and go to the full travel stop limit (leaving me heaving mightily on the control column whilst frantically winding the manual wheel) I made a point of identifying the precise circuit breaker that disabled the electric trim and ensuring that I could reach it easily. At least the electric trim on a Queenair was designed so that it had somewhat limited authority and could be overpowered by the pilot. Not all aircraft had that in mind when they were made.
  

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