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Posted for Jim Scales, re: the subject.

Jim, I've had this happen on my 235 a couple of times and it took a lot of
head-scratchin' to figure out what happened. In each case, the flap motor
drove past the magnetic down-stop (don't know if it's the same mechanism on
your airplane) on the flap drive actuator. I determined that tapping the
switch to put the flaps down in increments allows the magnetic rod "coast" a
bit before it stops. If this happens when you're close to the normal
stopping point, the rod can coast past the spot on the magnetic switch where
it is supposed to stop and then continue to drive until the actuator jams in
the "down" posiion.

When this happens, I have to open things up and detach the actuator rod from
the flap lever and twist it some to free it enough to allow it to run in the
other direction. As long as I run the flaps down in one continuous motion,
the limit switch always works. Check your system for how much the actuator
"coasts" when you let up on the switch. If it coasts even a little bit, this
might be the culprit.

As soon as I get the time, I intend to replace the magnetic limit switch
with a postiive-action micro-switch - arranged in such a way as to eliminate
the potential for "coasting past".

Dan Schaefer

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