How much play in Archer Trim Jackscrew?

[Bob Chilcoat]

The pitch trim jackscrew in our 74 Archer seems to have a lot of play in two
places. There is play at the bottom, where the nut is attached to the rod
for the antiservo tab, and there is play at the top, where the bearing is
linked to the attachment plate (by what appears to be some sort of clevis
yoke. This play results in
quite a bit of movement when I move the stabilator during my preflight. Any
of you A&P's know what is an acceptable amount of play, and where? After
the Alaskan Airlines DC-9 disaster, I'd hate to strip out my trim jackscrew.
--
Bob (Chief Pilot, White Knuckle Airways)

I don't have to like Bush and Cheney to love America

[Jay Masino]

Bob Chilcoat > wrote:
> The pitch trim jackscrew in our 74 Archer seems to have a lot of play in two
> places. There is play at the bottom, where the nut is attached to the rod
> for the antiservo tab, and there is play at the top, where the bearing is
> linked to the attachment plate (by what appears to be some sort of clevis
> yoke. This play results in
> quite a bit of movement when I move the stabilator during my preflight. Any
> of you A&P's know what is an acceptable amount of play, and where? After
> the Alaskan Airlines DC-9 disaster, I'd hate to strip out my trim jackscrew.

I believe that no perceivable play is acceptable. That said, I flew for
years with a little bit of play. Me and my A&P rebuilt my jackscrew this
past annual. Replaced the bushing(s), jackscrew and even one of the
rivetted support plates (which was pretty corroded). It really wasn't a
big deal. It probably only took 2-3 hours total. Just do it.

--- Jay



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