DIRECT SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
DIRECT SUPPORT TROUBLESHOOTING PROCEDURES
The troubleshooting procedures provided in this chapter assume that unit troubleshooting has been performed
unsuccessfully. Troubleshooting table 1 cannot list all malfunctions that may occur, all the tests and inspections needed to
find the fault, or all the corrective actions needed to correct the fault.
Table 1. Direct Support Troubleshooting
TEST OR INSPECTION
FUEL TRANSFER PUMP
1. Pump will not prime
Inspect vane pump.
Disassemble rotary vane pump, inspect components for cuts, scratches, burrs, etc. and replace any that are
2. Pump leaks at inlet
Inspect inlet packing.
Check for debris around O-ring. Check physical condition of O-ring. Clean inlet or replace O-ring, as required.
3. Pump leaks at input shaft
Inspect shaft seal and O-rings.
Remove shaft seal housing.
4. Pump leaks at vane pump housing
Inspect vane pump O-rings.
Remove vane pump housing.