UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11 Posted (6 years 10 months 2 weeks 3 days 7 hours ago) and read 3434 times:
We had a write up today to inspect an aileron. It turns out that with all the hyd. pumps on, the suspect aileron was holding a slight down deflection. The crew didn't report any control difficulties on the inbound flight. They noticed the problem on preflight. The split between the trailing edge of the aileron and the trailing edge of the adjacent flap was some 0.600". Way beyond limits to say the least. The right aileron also exhibited the down deflection, but to a lesser degree. I left before any of the major teardown began, but I did hear that the rig pins were fitting fine so far.
I'm sure I'll find out the answer tomarrow, but any hunches as to what would cause such a large down deflection of the ailerons with no control difficulties? As far as I know, no work was recently performed in the vicinity that would require rigging. Other than needing to be re-rigged, what could cause drooping ailerons on a CRJ-200?
Tangowhisky From United States of America, joined Jun 2006, 862 posts, RR: 8 Reply 1, posted (6 years 10 months 2 weeks 3 days 2 hours ago) and read 3392 times:
I am not a mechanic but I have a good memory so bear with me. I read recently somewhere that there was premature wear on the input device (tension regulator and/or linkages) causing uncommanded aileron deflections. Apparently it is device that drives the two PCUs and it has some early wear.
UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11 Reply 2, posted (6 years 10 months 2 weeks 2 days 9 hours ago) and read 3329 times:
The verdict is in. Turns out the cable tensions between the quadrants in the wheel well out to both ailerons was low. Once adjusted, everything fell back into line. I'll file that away for future reference...
UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11 Reply 4, posted (6 years 2 months 4 weeks 1 day 11 hours ago) and read 2935 times:
We've had a couple wreite-ups of config trim warnings which turned out to be caused by aileron trim being out of the green or right on the edge of green. It's good to know the system works like it's supposed to