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Sequence Valve - Loc-tite

Some years ago, at our equivalent of Oshkosh here in the UK, an LNC2
arrived from Sweden which had flown all the way with his nose gear door
down as a result of the sequence valve nut and bolt vibrating free.
Luckily I had my, then part-finished, LNC2 on display on its wing jacks so
I let him borrow these and gave him the correct nut/bolt to re-fit and do
retraction tests prior to setting off back to Sweden.  I then went home and
drilled 1/16" holes in each check nut and safety wired them!  I also paint
them with red torqueseal so that I can see any slight movement during
pre-flight checks.  In the first 10 hours of flying my nose gear door
hydraulic cylinder also loosened at the door end and the door was closing
but leaving about a 2" gap.  These check nuts have now had the same
treatment.

Firewall Engine Mount Torque

My solution to this problem was to take penny washers the same size as
those welded on the engine mount (1 1/2" I think) and use them as spacers
to fill the thickness of the fiberax material.  However, because the
washers are only providing compression resistance I drilled lightening
holes all around them to reduce the weight.  I recall that it needed two
washers at each mounting location but I may be wrong.  I would certainly
not recommend simply tightening the engine mount down on the
stainless/fiberax without spacers.

Happy landings (my last one was a greaser - but who knows about the next!)

michael

(LNC2 G-FOPP, based Cranfield UK)

 Dr Michael A Fopp
 michael_fopp@compuserve.com
 Signed in the UK at 10:18 (ZULU) on 15-Aug-01
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LML website:   http://www.olsusa.com/mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
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