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The fix Scott mentions (replacing the pop rivets on the body-mounted hinge
with AN3 bolts) works for me, too. In fact, I sort of thought it was a
service bulletin as, when Mike DeHate came down to do the inspection, first
flight and checking me out in N235SP (an early 235), he told me to replace
those rivets before too much time went by.

I flew for about 60-70 hours before doing so but then the hinge loops were
getting so worn and the rivets so loose I decided that it was time. It
looked to me that the prop slip-stream induced a severe vibration, when the
doors were open, that was the culprit. Regardless, installing the bolts in
place of the rivets has solved the problem - 600+ hours now and the hinges
don't seem to be wearing much at all.

I seems that the vibration started getting the rivets loose and, once loose
enough, that transferred the wear to the hinge loops.

I didn't want to countersink the hinge base as it's fairly thin, so I used
AN525 Washer head screws (nuts inboard) to get a large capture area and a
low profile where the wheels sweep past.

Dan Schaefer


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