Jim Brown a crit :
>
> About a year ago, every now and then the orange TCU light would
> flash. I'd power cycle and it would go away. Over time it
> is almost at the point that this happens every time. At first I
> thought it was just the waste gate sticking, but after further
> investigation I realized that if the waste was stuck, the servo
> would move and the cable would bow in and out. (Lockwood confirmed
> this).
>
Paul,
Went flying today, and paid special attention to the operation of the
TCU and lights. The following behavior may serve as a comparison with
your engine.
On power up, the red and yellow lights illuminate as advertised for
about one second, the yellow light going off last by about 1/10 second.
Could not hear the servo behind the panel, due to the gyros spinning up.
At holding point, it takes 25" MP to achieve the 4000 RPM for magneto
and CS governor checks.
At take-off, I advanced the throttle steadily to the 115 % stop in about
1.5 second. The MP needle went up direct to the 39.9 "(40) red mark and
stayed there. The aircraft being lightly loaded I was airborne in a very
short time.
During climb out I reduced to 5000 RPM/31" i.e. 75 % power.
If your MP remains just at the red line during take-off, you can be
assured that your TCU and servo are working as expected. I seem to
remember you told us that you had no problem in flight. So your problem
may just be that the yellow light doesn't illuminate at power up ?
Have you considered that the problem may lie with your light ?
FWIW,
Best regards,
Gilles
http://contrails.free.fr
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