PPRuNe Forums - View Single Post - 737NG Electrical "Source Off" light annunciator
Old 17th October 2010 | 10:54
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STBYRUD
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: ATPL
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From: GPS L INVALID
Exactly - it serves as a warning that the automatic transfer prevented the bus from becoming unpowered due to a failure or disconnection of the previously selected source (be it APU or engine driven generator).
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