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  #1  
Old 01-20-2021, 12:04 PM
SeattleAviator SeattleAviator is offline
 
Join Date: Nov 2020
Location: Seattle, WA
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Default Control Surface Clearance Requirements

I am doing a Pre-buy inspection of an RV-9a and note that some control surfaces (aileron, rudder, elevator) have very little clearance between them and surrounding structure. None of these controls are touching the surrounding structure but wafer thin margins. What is the clearance specification between 1)elevator and horizontal stabilizer at the counterweight end of the elevator, 2) rudder and vertical stabilizer at the top of the rudder, 3) outboard aileron and wing end cap? A jam could spoil my whole day! Also is there an easy way to adjust these clearances.

Thanks for your help.
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  #2  
Old 01-20-2021, 05:09 PM
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bruceh bruceh is offline
 
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Location: Ramona, CA
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Drawing 9 has the information for the wing. 1/4" gap nominal between wing tip and aileron. 3/16" nominal gap between aileron and flap.
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  #3  
Old 01-21-2021, 09:52 AM
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Steve Melton Steve Melton is offline
 
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if the control clearances are wafer thin be sure not to fly in any icing conditions or have bird a strike in the wrong place. this could be a show stopper for the sale unless it can be corrected. the thing more important than the engine is aircraft control.
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Last edited by Steve Melton : 01-21-2021 at 10:03 AM.
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Old 01-21-2021, 11:41 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Look closely at the flap and aileron hinges and see where the spacer washers have been placed in the hinge bolts, look for possibly redistributing the washers to get the required spacing. If you have to move the aileron outboard, you may need to sand the inboard edge of the wingtip to get the required spacing there.
For the elevators & rudder, you would have to remove those surfaces to adjust the hinge rod end bearings to gain the spacing you require. Refer to the plans for the suggested initial bearing distances and adjust ALL bearings to get required clearances and free movement.
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  #5  
Old 01-21-2021, 12:00 PM
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Mel Mel is offline
 
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If the aircraft is not yet painted, that can also be a factor. Paint will narrow the gap by twice the thickness of the paint.
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