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I recently took a trip to Tulsa.  It was 106, in the shade, and the
plane was terribly heat soaked on the black tarmac.  the plane is in
gray primer.  The controls were so hot to touch that flying was
difficult.  You get the picture.

the mac trim servos quit working reproducibly, when it was that hot.
Fortunately, as the plane cooled in the  climb, so did the panel, and
ultimately the trim control returned.  FYI, there is a temperature
sensitive voltage regulator that is working too hard with several LEDs
for aileron, rudder, flap position (50 milliamp) and intermittent use of
trim servos (200 ma).  the fix, in discussion with Ray Allen, (used to
DBA Mac) is to put several voltage regulators and isolate the circuits.
I am writing this to illustrate a potential single point failure mode.
The trim stuck down in a 230 KIAS descent, and had it been real IFR, a
rough running engine, or something like that, it could have been tough.

Also, has anyone noticed a big difference in CHT in hotter than normal
operations?  It was still 38 F at FL 200, and the CHTs were creeping
over 400 when they usually run about 375 or so?

Why also do the CHT rise so much when going from FL 230 to FL 260 with
everything else keep the same?

Michael D Smith



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Please send your photos and drawings to marvkaye@olsusa.com.
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