TM 1-1520-238-T-7
Change 5
10–101
10–17. FUEL CROSSFEED/BOOST SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
10–17
Task
Result
t. On pilot FUEL panel, set CROSSFEED
switch to AFT TK.
u. Have assistant positioned to check fuel
overboard drains beneath engines 1 and 2
nacelles (fig. 10–44).
v. On pilot FUEL panel, set BOOST switch to
ON. On pilot caution/warning panel, BOOST
PMP ON indicator lights, and fuel flows from
engines 1 and 2 nacelle fuel overboard
drains.
If BOOST PMP ON indicator is not lighted, replace
lamp (TM 1-1520-238-23). If replaced lamp is not
lighted, go to paragraph 10–23.
If fuel does not flow from engines 1 and 2 nacelle
overboard drains, refer to TM 1-1520-238-T-4 to
troubleshoot engines.
w. On pilot FUEL panel, set CROSSFEED
switch to NORM, BOOST switch moves to
OFF. On pilot caution/warning panel,
BOOST PMP ON indicator is not lighted.
Fuel stops flowing from engines 1 and 2
nacelle overboard drains.
If BOOST PMP ON indicator is lighted, go to
paragraph 10–25.
If fuel flows from engines 1 and 2 nacelle overboard
drains, refer to TM 1-1520-238-T-4 to troubleshoot
engines.
x. On pilot FUEL panel, verify ENG 2 switch is
set to ON.
y. On pilot FUEL panel, set CROSSFEED
switch to AFT TK.
z. On CPG FUEL panel (fig. 10–48), set
ORIDE switch to CPG. Engines 1 and 2 fuel
crossfeed/shutoff valve indicators move to
normal position.
If FUEL BST circuit breaker does not stay closed, go
to paragraph 10–44.
If engine 1 fuel crossfeed/shutoff valve indicator does
not move to normal position with ORIDE switch set to
CPG, go to paragraph 10–33.
If engine 2 fuel crossfeed/shutoff valve indicator does
not move to normal position with ORIDE switch set to
CPG, go to paragraph 10–37.
aa. (ADB) On pilot and CPG caution/warning
panels (fig. 10–60) that amber XFEED
indicators are not lighted.
If pilot and CPG amber XFEED indicators are lighted,
go to paragraph 10–35G.
ab. On CPG FUEL panel, set TK SEL switch to
FROM AFT. 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 10–34.
If engine 2 fuel crossfeed/shutoff valve indicator does
not move to aft position, go to paragraph 10–35.
