Mark James Boyd wrote:
I've gone back and forth on this. I've been a big
proponent of the assembly check, and thought the PCC was redundant.
Recently, however, during a PCC a bellcrank broke and
this was caused by the pressure exerted by the "helper."
Nice to have this happen on the ground, and I can't
think of how this could have been detected without
a PCC. So now I think a PCC is useful too...

WHat aircraft was this, which bellcrank, and how was the helper exerting
pressure? Or was he simply holding the surface steady while the pilot
applied the pressure? What, exactly, broke (bellcrank, mounting of the
bellcrank, a bearing), and why did it fail?
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Eric Greenwell
Washington State
USA