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TM 10-4320-351-14
Figure 5-1. Pumping Assembly Interconnecting Diagram
The four system fault lights are grouped in the center of the control panel. The ENGINE HOT, LOW OIL PRESSURE and
PUMPAGE HOT indicators illuminate red to warn the operator of a condition dangerous to personnel or the system. The
ALTNTR indicator illuminates yellow to caution the operator of an electrical malfunction which may limit or preclude
continued system operation. FAULT LIGHTS switch S5 must be ON for any of the fault lights to operate.
The LOW OIL PRESSURE fault light is controlled by a pressure sensor on the engine. If the oil pressure decreases to an
unsafe level during operation, the contacts in sensor S7 close, providing a current path from ground through the sensor,
LED CR6 and FAULT LIGHTS switch S5 to the 28 VDC line after EMERGENCY STOP switch S5.
The ENGINE HOT fault light is controlled by a temperature sensor mounted on the engine. If the engine oil temperature
increases to 2750F (135°C) during operation, the contacts in sensor S8 close, providing a current path from ground
through the sensor, led CR7 and FAULT LIGHTS switch S5 to the 28 VDC line after EMERGENCY STOP switch S5.
The PUMPAGE HOT fault light is controlled by a temperature sensor mounted on the fuel transfer pump discharge
housing. If the pumpage temperature increases to 175°F (79°C) during operation, the contacts in pumpage
overtemperature sensor S8 open, removing the ground from relay K1 and the 28 VDC buss. The contacts of relay K1
return to the deenergized position, removing power from the fuel shutoff solenoid which closes the fuel ports to the fuel
injectors and
5-4
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