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Posted for Alain NOIREAUX <alainoireaux@club-internet.fr>:
colyncase on earthlink a écrit :
my stec 55x (on my cessna) has auto-trim, which means the auto-pilot senses the torque required to
maintain the desired flight condition and adjusts the trim to keep that torque within some pre-specified
limit.
However, there is a pilot controlled trim switch. If the pilot makes a trim change directly, the a/p
disengages. The reason for this is that if it didn't, you could dial in lots of trim but you wouldn't
feel it because the a/p would be counteracting it, until it couldn't any more at which time it will
disengage and hand you the airplane way out of trim, resulting in an "excursion"
It is the only safe way to work with an A/P . Either your A/P has an autotrim
fonction and trims the pitch control itself,when needed,or you have it
disconnected automatically as soon as you touch your electric trim command .
If you don't have one of these fonctions ,or have a manual trim,YOU MUST
disconnect yourself the A/P to trim the pitch control, to avoid your plane
going brutally nose Up or Down when the A/P cannot anymore control the pitch
.
Alain Noireaux
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