B737 Stab Trim Switch(es)

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23rd January 2011 | 16:50

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oscarzulu737

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From: Somewhere out there...

B737 Stab Trim Switch(es)

Can someone explain off of a reference why the trim switch on the control wheel is actually two switches side by side?

23rd January 2011 | 17:15

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BOAC

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From: UK

Double pole switch

23rd January 2011 | 17:19

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STBYRUD

Joined: Aug 2009

Aviation Qualifications: ATPL

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From: GPS L INVALID

They prevent a runaway caused by one shorted or stuck switch. this way there are two breaker points in the circuit. (plus the cutout switches...)

23rd January 2011 | 22:40

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blousky

Joined: May 2003

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From: Liège, Belgium

And you can even operate the trim with both switches in different directions!
Now try it and see which one give the direction input and which one just make contact.

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