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Ok Ernie and all.
If the ships battery is flat, ie you put on the master switch and nothing.
You go for the power cart and plug it into the external power socket, hey presto you have power (but the master is not on).
You carry out a start of both engines and disconnect the power cart, go to switch on the master and nothing, because the battery is flat.
However if you jumpered the battery and started the rear engine, disconnect and run the engine to enable the front to be started, the system would be online and charging the battery (at a high rate).
1. Some of the bus services are isolated with the external power connected including avionics.
2. The master relay and switch control the alternator field.
3. the 337G and above have ALT restart which (if the restart batteries are ok) should start up the alternators after start and bring the systems on line.
So the only way to get your Skymaster back into the air is to jumper the battery.
BTW, there is such a thing as removing the battery and charging up rather than replacing it due to it being flat.
Hope this answers your questions
Like to hear your comments?
Pete
ps Piper a/c external power sockets connect across the battery thru a contactor for starting, do'nt know why Cessna did not do this???.
Cheers
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