Leerjet 35/36 Developed for Training Purposes 4B-17
February 1998
Electrical System
External Power
With a ground power unit (GPU) connected to the external
power receptacle, placing either BAT switch in the on position
closes the external power control relay. External power ener-
gizes the external power relay through the external power over-
voltage cutout circuit; power then flows to the Battery bus.
If an overvoltage condition occurs and GPU voltage exceeds
approximately 33V, the cutout circuit energizes the overvoltage
cutout relay. The cutout relay closes and disconnects external
power from the aircraft by opening the external power relay.
On S/N 35-618 and subsequent, 36-056 and subsequent,
and previous aircraft with AMK 86-5, a five amp fuse pro-
vides additional external power protection. If an electrical fault
occurs, the fuse opens and causes the external power control
relay to open. When the control relay opens, the external power
relay opens to disconnect external power from the aircraft.
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