REFLECTOR: MT Prop failure mode? - Resolved

[Terry Miles]

Looking back, as I assembled the various electrical, mechanical and engine
components in my airplane, I thought I took due care at what I was doing,
and had a "class room" sense of the importance of each component.  After
about 80 hours I have been surprised at what worked loose.  My classroom
outlooks switched dramatically to "real world."    and made me a believer in
preflight and periodic inspections of the "important stuff."  ...and I might
add that my list of important stuff grows as time goes by.  Thanks, Bernie.
I put that one on my list too.  
Terry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Bernard Despins
Sent: Wednesday, November 19, 2008 9:42 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: MT Prop failure mode? - Resolved

Thanks for all the suggestions. 

I had another look at the nut/jam nut with safety wire at the prop hub 
used to set the low pitch stop.

Although securely safety tied, both nuts had backed off together.  Very 
dangerous, since this must of occurred during in a single 20 minute run 
of the engine.  It went from 300 hp on the previous run to 30 hp.  Even 
with the safety wire in place, both nuts could be easily turned together. 

I guess this stresses the importance of jamming the two nuts very 
securely and safety tying very tight.  Maybe I'm missing something, but 
in my opinion, it is not a very good way of securing such an important 
fastener.

Bernard Despins


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