Flap tuneup
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Flap tuneup
I have been trying to work the slop out of my flap rigging on my M4-220.
I changed the hinge bushings and adjusted the cable tension. I also installed new springs. There still seems to be some verticle play at the bellcrank. Reading an earlier post by Jeremy he suggested rebushing the bellcrank. This sounds good but when I look at the parts drawing it does not show a bushing in the bellcrank. I would appreciate any clarification or advice. Thanks.
I changed the hinge bushings and adjusted the cable tension. I also installed new springs. There still seems to be some verticle play at the bellcrank. Reading an earlier post by Jeremy he suggested rebushing the bellcrank. This sounds good but when I look at the parts drawing it does not show a bushing in the bellcrank. I would appreciate any clarification or advice. Thanks.
flyfish1
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Make sure the bracket holding the bellcrank is tight and is not stressed and moving under load. If so replace.
Check the bellcrank pivot holes for wear, a tiny bit is a lot at the flap.
Push or drill the bellcrank bushing out and replace with new or make one on a lathe with good fit to the pivot bolt. If bracket holes are worn, use next size bolt and enlarge holes to match.
The bellcrank should not move up and down when loading it.
Check the pushrod ends for snug fit and no wear.
Check no flat spots or ovaling of the various pulleys.
Rig the flaps by adjusting pushrods so bottom of flap is flush with wing bottom when upward pressure is applied to flap.
Check the bellcrank pivot holes for wear, a tiny bit is a lot at the flap.
Push or drill the bellcrank bushing out and replace with new or make one on a lathe with good fit to the pivot bolt. If bracket holes are worn, use next size bolt and enlarge holes to match.
The bellcrank should not move up and down when loading it.
Check the pushrod ends for snug fit and no wear.
Check no flat spots or ovaling of the various pulleys.
Rig the flaps by adjusting pushrods so bottom of flap is flush with wing bottom when upward pressure is applied to flap.
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- aero101
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Loose or incorrectly adjusted control cables is generally part of your problem as well... It's generally a combination of both the cables and the control rod which is what positions the bell crank properly. If you're able to push up on flaps to negative or reflex flaps (airloads will do this in flight as well) you are technically unairworthy as aircraft does not meet the specs of TCDS. Chances are when adjusted properly you'll pick up a couple MPH as well. The reflex flaps with that short wing will cause higher AOA on main wing resulting in a good bit more drag..
Jim
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Giving money and power to government is like giving whiskey and car keys to teenage boys.
http://www.northstar-aero.com
Giving money and power to government is like giving whiskey and car keys to teenage boys.
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- aero101
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Yes, nice up here this year as well, though still pretty chilly...
Jim
http://www.northstar-aero.com
Giving money and power to government is like giving whiskey and car keys to teenage boys.
http://www.northstar-aero.com
Giving money and power to government is like giving whiskey and car keys to teenage boys.
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