TM 55-1520-240-23-7
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MISCELLANEOUS INSTRUMENTS
(Continued)
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The caution system includes six pressure switches in the
main oil system, three pressure switches in the auxiliary
oil system, nine lights on the maintenance panel and two
capsules in the caution panel, all powered by 28 vdc.
The maintenance panel is located in the aft cabin, right
side. When pressure in the monitored oil system falls
below the normal range, its switch completes a ground
circuit causing the corresponding maintenance panel
transmission oil pressure light to come on. A diode
circuit in the maintenance panel connects this ground
circuit to the master caution panel to light either the
XMSN OIL PRESS or XMSN AUX OIL PRESS capsule.
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