B737 Stab Trim Switch(es)

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23rd Jan 2011, 16:50

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oscarzulu737

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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 Jan 2011, 17:15

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BOAC

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Double pole switch

23rd Jan 2011, 17:19

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STBYRUD

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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 Jan 2011, 22:40

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blousky

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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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