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Date: Tue, 04 Apr 2006 20:52:43 -0400
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From: "Dan Schaefer" <dfs155@adelphia.net>
Subject: Flap Motor Failure 320
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Had the same thing happen to me a couple of years ago. Figured that one of 
the relay contacts, that short the motor to provide braking (and 
incidentally, provide the alternate ground to allow the motor to run in 
either direction) had burned bad enough to not make contact. Without that 
ground, the motor will run one way but not the other and will coast when 
de-energized.

When the motor coasts, it can allow the magnetic spot on the feed-back rod 
to get past the reed limit switch and re-energize the motor, driving it into 
the mechanical limits almost before you can get off of the switch. On the 
early flap mechanism (235 and maybe 320) if the failure is in the flaps up 
direction, the system will likely jam - the push-rod and flap lever will go 
just about over-center.

Turned out that a connector on a spade terminal on the relay had worked it's 
way off the contact - pushing it back on fixed the problem - but realizing 
what could happen if the relay really did fail, I now carry a spare.

Dan Schaefer
Early 235