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jtsastre · February 22nd, 2008, 20:22

One of the more common questions I get out of new students is why the electric trim on the left seat yoke of the newer Cessnas has two switches. My first guess was for redundancy. If one switch is pressed, it will not activate the trim. Also if one shorts or gets stuck it won't cause runaway trim. I've heard also that one switch drives the trim motor while the other activates a clutch, meaning the trim can only be activated by pressing both switches. Any validation for these? Thanks for the help.

Jtsastre

February 22nd, 2008, 20:22	#1
jtsastre Junior Member Join Date: Aug 2005 Location: California Posts: 105	Cessna's electric trim One of the more common questions I get out of new students is why the electric trim on the left seat yoke of the newer Cessnas has two switches. My first guess was for redundancy. If one switch is pressed, it will not activate the trim. Also if one shorts or gets stuck it won't cause runaway trim. I've heard also that one switch drives the trim motor while the other activates a clutch, meaning the trim can only be activated by pressing both switches. Any validation for these? Thanks for the help. Jtsastre Last edited by SteveC; February 23rd, 2008 at 22:38. Reason: Fix title.