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Carburator to manifolt nuts on Lycoming

 
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CardinalNSB(at)aol.com
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PostPosted: Sun Aug 02, 2009 2:10 pm    Post subject: Carburator to manifolt nuts on Lycoming Reply with quote

Well, studs and nuts actually. While taking the carb off my Lycoming 0-360 A1A, my mechanic commented on why the factory used a coarse thread stud, and a nut without safety wire, over a flat washer and star washer.

He thought a MS rated metal self locking nut over a flat washer seemed more appropriate.

Can I legally do that on a certificated aircraft? Thanks, Skip



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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1135
Location: Sun Lakes AZ

PostPosted: Mon Aug 03, 2009 4:37 am    Post subject: Carburator to manifolt nuts on Lycoming Reply with quote

Your mechanic needs to go to the O-320 parts manual, and use the parts
called for, which I am pretty certain are the parts you mention, but
there should be a lock tab or equivalent that prevents the nut from
rotating. Parts substitution is not acceptable, he needs to have the
proper and current parts manual and go by the parts specified,
assuming it is on a certified engine on certified aircraft. He should
not be introducing his own idea of what is correct.
Experimental, you do what you want, and assume the risks.

On Sun, Aug 2, 2009 at 2:59 PM, <CardinalNSB(at)aol.com> wrote:
Quote:
Well, studs and nuts actually.  While taking the carb off my Lycoming 0-360
A1A, my mechanic commented on why the factory used a coarse thread stud, and
a nut without safety wire, over a flat washer and star washer.

He thought a MS rated metal self locking nut over a flat washer seemed more
appropriate.

Can I legally do that on a certificated aircraft?  Thanks, Skip
________________________________



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Kelly McMullen
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