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MichaelGibbs(at)cox.net
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 Posted: Thu Jan 05, 2006 8:56 am Post subject: Re: Elevator Trim systemsElevator Trim systems |
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Lloyd asks,
| Quote: | Skystar...offered a retro kit to replace the screw with trim tabs,
why would they offer the retro kit if the screws were so well liked?
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John McBean can probably tell the story in all of it's glory, but my
understanding was that the manufacturer of the screw device found out
it was being used in airplanes and cut SkyStar off--they were
concerned about the liability exposure. It had nothing to do with
the system being liked or disliked.
There was at least one failure of the unit that caused some concern
but the problem is easily avoided with improved anchoring of the unit
to the airframe. Hey, if it is good enough to use in MD-80s and
B-717s...
Mike G.
N728KF
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Mdkitfox(at)aol.com
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| Posted: Thu Jan 05, 2006 9:55 am Post subject: Re: Elevator Trim systemsElevator Trim systems |
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I had the original jackscrew system on my V and decided to replace it with
the retrofit kit for the manual trim system. I heard the screw system had
more than one failure, but only 1 resulted in an incident. The bottom line is
the actuator lower bracket metal looks to be ordinary 'pot metal' and not very
strong. The bracket is where the problem lies. Some guys have made a
support to retain the actuator in case the bracket fails. I suppose this will
work, but frankly, that bracket is a single point failure that could lead to a
severe control problem should it fail in flight, i.e. the horizontal
stabilizer will free float and cause pitch problems. Also the cost of a replacement
actuator is over $400.00. Overall I thought the retrofit system was a big
improvement.
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jcant1(at)direcway.com
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| Posted: Thu Jan 05, 2006 11:14 am Post subject: Re: Elevator Trim systemsElevator Trim systems |
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Where can I purchase a manual trim retrofit kit for my V?
Jim Cantrell
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