Duncan,
I identified this problem some time back.
My solution was to insert into the torque tube, four anodised alloy discs
10mm thick, cross drilled and positioned to align with the torque tube cross
drills at TP's 9 and 12 and secured in position with Loctite. The purpose of
the discs is to prevent the torque tube distorting - the purpose of the
Loctite is to hold the discs in place during assembly - nothing more.
At each station, two alloy "saddle plates" , inside radius machined to match
TP12 & TP9 OD, are bolted in place using AN hardware (replacing the SS
pins).
This provides a positive clamping to prevent movement, drive is provided by
the double shear of the bolts.
Only thing to watch out is the tight clearance between the securing nut and
the bulkhead.
This arrangement can be dismantled and re-assembled at will - unlike your
Loctite solution.
Engineering approval would of course be needed.
Nigel
----- Original Message -----
................. I can't see any proven long term alternative to the
Loctite route and that wouldn't involve potentially protractedPFA approval.
Even then, the Loctite bond might be subject to progressive failure.
Duncan McFadyean
by Aviators Network UK - info@avnet.co.uk
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