Reset elevator trim pointer
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- johnsunday
- Posts: 54
- Joined: Tue Oct 09, 2007 4:08 pm
Reset elevator trim pointer
During the last annual on the old Alaska Bush Plane we found a cracked horizontal bulkhead just under the horiz stab which required a disassembly of the aft end control surfaces. The elevator trim wheel indicator now points to a position aft of the old position. All angles on the trim tab are correct when the wheel is moved to its forward and aft limits, it's just the pointer doesn't point to the "green band" it use to point to. How is this pointer repositioned?
Re: Reset elevator trim pointer
I just took mine apart and it's so simple, it's genius.
The side of the wheel has a spiral groove cut in it (I always thought they were decorative circles) The trim indicator thingy rides in this groove.
To adjust it, Set the trim neutral on the tail and take out the 5 screws that hold the side of the trim wheel plate on.
Remove the side plate, adjust the trim indicator thingy to the position you want and put the thing back together being careful to get the indicator in the groove.
Before doing this, make sure you have enough links on the trim chain for full travel. If the needle is off, you might not be centered on the chain.
The side of the wheel has a spiral groove cut in it (I always thought they were decorative circles) The trim indicator thingy rides in this groove.
To adjust it, Set the trim neutral on the tail and take out the 5 screws that hold the side of the trim wheel plate on.
Remove the side plate, adjust the trim indicator thingy to the position you want and put the thing back together being careful to get the indicator in the groove.
Before doing this, make sure you have enough links on the trim chain for full travel. If the needle is off, you might not be centered on the chain.
Re: Reset elevator trim pointer
That's slick. I love it when something isn't over-engineered.
Gene Feher
Argyle (1C3), NY
'52 170B N2315D s/n 20467 C-145-2
Experimental J3 Cub Copy N7GW O-200
Argyle (1C3), NY
'52 170B N2315D s/n 20467 C-145-2
Experimental J3 Cub Copy N7GW O-200
Re: Reset elevator trim pointer
Before taking it apart, I couldn't fathom how it worked.
As soon as I took the cover off, it was a revelation.
As soon as I took the cover off, it was a revelation.
Re: Reset elevator trim pointer
As Goldie used to say.... Grooovey...
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.