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  #1  
Old 08-12-2019, 10:10 AM
Tacco Tacco is offline
 
Join Date: Jan 2017
Location: White Salmon, WA
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Default Vibrating Flap Handle

Today on approach my flap handle began vibrating noticeably. 60kts and full flaps. No vibration through the stick at all. Went away on final. When I say noticeable it was vibrating against my leg significantly. I’d say the end end (button) was displacing plus and minus 1/8 - 1/4 laterally. What the heck!
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Steve Morrow
RV-12 N12SM
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  #2  
Old 08-12-2019, 10:13 AM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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That is indeed odd, and I'd want to figure out the reason before further flight. There was an SB for inspecting the flaperon bearing bracket. Have you done that inspection?
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  #3  
Old 08-12-2019, 11:48 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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There is also a Safety Alert on early flaperon actuator arms with incomplete welds.
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  #4  
Old 08-12-2019, 12:55 PM
Tacco Tacco is offline
 
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Location: White Salmon, WA
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Yes, very odd. What makes it really odd is that there was no stick vibration. I don’t think it was a control surface problem or a issue with the brackets and pushrods. And yes I complied with the SB. Upon landing, the handle doesn’t appear loose. Could it be that I just hit some kind of resonant vibration frequency of the flap handle itself? I wouldn’t even know how to troubleshoot this one.
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  #5  
Old 08-12-2019, 02:22 PM
rv9builder rv9builder is online now
 
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Location: Irvine, CA
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Quote:
Originally Posted by Tacco View Post
Could it be that I just hit some kind of resonant vibration frequency of the flap handle itself?
That would be my guess. I had a similar issue in a Piper Warrior that I owned. On short final, at a certain rpm under certain conditions, the door handle would suddenly come alive and start vibrating like crazy! It would only happen occasionally, but when it did, it was loud enough to be quite startling. I tried to track down what was causing it, but was unsuccessful.
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  #6  
Old 08-12-2019, 08:02 PM
Tacco Tacco is offline
 
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Location: White Salmon, WA
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Pretty much determined I need to dynamically balance the prop. Anyone know where to rent a Dynavibe?
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  #7  
Old 08-12-2019, 10:50 PM
Hal-san Hal-san is offline
 
Join Date: Nov 2007
Location: Benton City, WA
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Steve, I don't know where white Salmon is but the EAA chapter in Puyallup does dynamic prop balances for $50.00 if you are a member of EAA.
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