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Hi All:
Many owners wonder how often you should check you elevator trim. If you sit outside, every 2 years should do. This allows you to clean, lubricate, and check the pieces that make it work.
Definitely if you find one of the large area washers not spinning, then teardown and clean.
When the washers do not rotate freely, you will find this happening to your Clevis bolts:
Here is some SS hardware we use to rebuild. You cannot get a Clevis bolt in SS since it would not pass the shear test. Notice the wear on the clevis bolts as compared to a new one? Should your trim break in flight, it will still be flyable, but not fun.Cheers
Roscoe
Yankee-Aviation.com
513-519-7008 -
Roscoe, excellent post and something that is pretty easy to check on preflight.
I’ve noticed a few Grummans with excessive play between the trim jackscrew, C-clip and where it passes through the aft bulkhead. This can cause play in the elevator trim even if the roller bearings, clevis bolt, etc are otherwise in good shape. Careful shimming to eliminate the jackscrew play is usually all that is required.
Speaking of the elevator trim jackscrew, a careful cleaning and lubrication with a silicone spray will go a long way towards freeing up a sticky elevator trim control 😉
Warm Regards,
Tracy
N9683U
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