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TM 55-2915-335-30&P
SECTION Ill. TROUBLESHOOTING
2-7. General.
a. Troubleshooting of the fuel boost pump is broken into two separate functions: a fault isolation procedure and
maintenance troubleshooting. Perform the fault isolation procedure, Table 2-1, to determine if a malfunction exists. If
a malfunction exists, perform maintenance troubleshooting, Table 2-2, to find where the problem is located and how
to correct the problem.
b. Either the entire boost pump assembly, or just the pump cartridge maybe received for maintenance. If just the
pump cartridge is received, start with block 1 of Table 2-1, Fault Isolation. If the entire boost pump assembly is
received, start with block 4 of Table 2-1, Fault Isolation.
c. Table 2-1 is in the logic tree format. Starting with either block 1 or block 4, perform the procedure described to
determine the answers to the questions asked. If an answer is YES, proceed to the block listed after the word YES.
Continue until a specific fault is isolated. If an answer is NO, refer to the listed malfunction number in Table 2-2.
Troubleshoot that malfunction as instructed to find the problem; repair the pump per the maintenance paragraph
listed.
d. Table 2-2 contains maintenance troubleshooting procedures for locating and correcting pump problems which
are the responsibility of Aviation Intermediate Maintenance. Each malfunction for a pump assembly or pump
cartridge includes tests and inspections. Performing the tests and inspections will help you to determine probable
causes and corrective actions to take. Perform the tests/inspections and corrective actions in the order listed.
2-8. Tools and Test Equipment.To perform fault isolation and troubleshooting procedures, the following test
equipment is required:
Fuel Pump Test Tank (Item 5, Appendix D)
28 volt DC Power Supply (adjustable to within 0.2 volts)
DC Voltmeter (accurate to within 0.2 volts)
Ammeter (accurate to within ±2%)
NOTE
Before performing fault isolation, read and become familiar with the
final test procedure in paragraph 2-25.
NOTE
Troubleshooting procedures will not reveal a fault in the RFI circuit.
If it is reported that fuel pump causes radio interference, inspect
and/or replace RFI circuit per paragraph 2-23.
2-2
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