Thread: Dash 8 dc gen fail
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Old 04-08-2011 | 03:40 PM
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From: B787 FO
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Originally Posted by CentralPa717
Also, with main bus tie switch to ON, how does that affect auxillary battery power on the left bus vs main battery power when only on battery power. ie, does the auxillary battery power only the left main and essential bus, or will the main battery power both mains, leaving the auxillary to only the left essential bus?
Short Answer: When on battery power only (assuming you mean essential battery power) the Aux Battery powers only the left essential bus (in basic terms). The main battery will power the right essential bus (in basic terms) and the right main bus. If the main bus tie is selected ON, then the main battery will also power the left main bus. The aux battery NEVER powers the left main bus.

Any more questions, feel free to PM me. You'll need to make 10 posts on APC first.
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