At 06:20 PM 22/01/2007, you wrote:
Thanks John
So I am assuming the problem only occurs due to incorrect assembly
and not during operation after a correct assembly.
Paul
Yes, nothing wrong with it after assembly except it may be working backwards.
However the one I saw in NZ obviously had the aileron differential
wrong which was fairly obvious to me as a result of the drives being
reversed during maintenance.
The design lesson is that it would have been possible to design the
glider so that the skew drives were identical or failing that that
the rod that went in to the aileron was of different diameters for
each side so that it wouldn't fit on one side if it was the wrong
one. Hard to catch all the possibilities of course.
The operational lesson was that the procedures were in place to catch
the problem in 3 places. The bloke doing the annual should have
measured the control deflections, the guy who rigged the glider
should have done a check after connecting the controls and the test
pilot should have noticed the wrong sense of the controls before
stepping in to the cockpit. In the first case I mentioned they were
in fact 3 different people at 3 different times.
Pretty obviously the procedures were in place.
Question is why weren't they followed and would more onerous or
complex procedures have any different outcome?
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
Int'l + 61 429 355784
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