TM 10-4930-351-14
0013 00
The ENGINE HOT fault light is controlled by a temperature sensor mounted on the engine. If the engine oil temperature
increases to 275 F (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 stops the engine. When
relay K1 deenergizes, a current path is created through FAULT LIGHTS switch S5, LED CR9 and the contacts of relay K1
to the 28 VDC line after EMERGENCY STOP switch S5. High pumpage temperature is the only fault condition which
causes an automatic system shut down. The alternator output will decrease to zero when the engine stops but the PUMPAGE
HOT fault light will remain illuminated if the battery is connected at the NATO connector.
The ALTNTR fault light is controlled by circuits in the voltage regulator which use battery voltage as a reference. The fault
light illuminates any time the rectified alternator output is less than the reference battery voltage.
Two RFI networks, one between the battery and voltage regulator VR1 and one between the alternator and voltage regulator
VR1 suppress any Radio Frequency Interference (RFI) generated or radiated by AAFARS.
FUEL DRUM
Adapter assembly stem leaks.
Inspect for damaged adapter assembly preformed packing.
Install serviceable preformed packing on valve stem (WP 0081 00)
CCR NOZZLE ASSEMBLY
1. Leakage between strainer body and strainer housing.
Step 1. Inspect strainer body/housing connection for looseness.
Tighten connection as required.
Step 2. Inspect preformed packing, housing, and body for damage.
a.
Remove strainer body from housing (WP 0075 00).
b.
Replace packing if damaged (WP 0075 00).
c.
2. Leakage between nozzle inlet coupling and hose coupling.
Step 1. Inspect coupling locks for damage.
If damaged, replace coupling (WP 0076 00).
Step 2. Inspect gasket for damage.
Replace gasket if damaged (WP 0075 00).
3. Inadequate fuel flow from CCR nozzle.
Step 1. Inspect for dirt or other foreign matter.
a.
Remove strainer (WP 0075 00)
b.
Verify that nozzle and strainer is not block by dirt or foreign matter. Clean or replace strainer (WP 0075 00).
Step 2. Replace nozzle assembly.
Step 3. Refer to Direct Support maintenance for repair.
0013 00-7
