TM 1-1520-240-CL
E-9
FUEL SYSTEM
Aux Fuel Pump Failure
1. FUEL QUANTITY selector switch — Check.
If one or both auxiliary fuel tanks have fuel remaining:
2. AC-DC FUEL PUMP circuit breakers — Check
in.
3. FWD and AFT AUX FUEL PUMP switches
(affected side) — OFF.
4. AUX FUEL PUMP switch — ON (each aux tank
with fuel remaining).
If AUX PRESS indicating light remains on:
5. AUX FUEL PUMP switch(es) (inoperative
pumps(s)) — OFF. Monitor FUEL QUANTITY
indicator for the affected tank.
6. AUX FUEL PUMP switch(es) — ON for
operative pumps or OFF for inoperative pumps.
FUEL VENTING
1. AUX FUEL PUMP switches (affected side) —
OFF.
2. Main tank (affected side) — Monitor.
When 1,000 pounds of fuel remain:
3. AUX FUEL PUMP switches — ON (monitor fuel
quantity).
When tank quantity reaches 1,600 pounds:
4. AUX FUEL PUMP switches — OFF.
5. Steps 2 through 4 — Repeat until auxiliary tanks
are empty.
L or R FUEL PRESS Caution
1. XFEED switch — OPEN (above 6,000 feet
PA).
2. FUEL PUMP(S) circuit breakers — Check in.
Pump(s) are operational — Proceed with step 3.
