TM 1-1520-238-T-7
10–102
Change 5
10–17. FUEL CROSSFEED/BOOST SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
10–17
Task
Result
ac. On CPG FUEL panel, set BOOST switch to
BOOST. Fuel flows from engines 1 and 2
nacelle overboard drains (fig. 10–44).
If FUEL BST circuit breaker does not stay closed, go
to paragraph 10–44.
If boost pump does not operate with ORIDE switch
set to CPG, go to paragraph 10–36.
If fuel does not flow from engine 1 nacelle overboard
drain, refer to TM 1-1520-238-T-4 to troubleshoot
engine.
If fuel does not flow from engine 2 nacelle overboard
drain, refer to TM 1-1520-238-T-4 to troubleshoot
engine.
ad. On CPG FUEL panel, set TK SEL switch to
NORM. BOOST switch moves to OFF,
engine 1 and engine 2 fuel crossfeed/shutoff
valve moves to normal position (fig. 10–53),
and fuel stops flowing from engines 1 and 2
nacelle overboard drains.
If BOOST switch is ON with TK SEL switch not set to
FROM AFT, replace CPG FUEL panel
(TM 1-1520-238-23).
If engine 1 fuel crossfeed/shutoff valve indicator does
not move to normal position, go to paragraph 10–33.
If engine 2 fuel crossfeed/shutoff valve indicator does
not move to normal position, go to paragraph 10–37.
If fuel flows from engine 1 nacelle overboard drain,
refer to TM 1-1520-238-T-4 to troubleshoot engine.
If fuel flows from engine 2 nacelle overboard drain,
refer to TM 1-1520-238-T-4 to troubleshoot engine.
ae. On CPG FUEL panel (fig. 10–48), set TK
SEL switch to FROM FWD. Engines 1 and 2
crossfeed/shutoff valve indicators move to
forward position.
If engine 1 fuel crossfeed/shutoff valve indicator does
not move to forward position, go to paragraph 10–38.
If engine 2 fuel crossfeed/shutoff valve indicator does
not move to forward position, go to paragraph 10–41.
af. On CPG FUEL panel, set ORIDE switch to
PLT. Engines 1 and 2 fuel crossfeed/shutoff
valve indicators move to aft position.
If engine 1 fuel crossfeed/shutoff valve indicator does
not move to aft position, go to paragraph 10–32.
If engine 2 fuel crossfeed/shutoff valve indicator does
not move to aft position, go to paragraph 10–26.
