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opens the boost pump shutoff valve which directs pressurized
air to the air driven boost pump. When the
switch is in the OFF position, the engines receive fuel
(through a suction feed system) via the enginemounted
fuel pumps. When the BOOST switch is in
the ON position, and the CROSSFEED switch is in
the AFT TK position, both engines feed from the aft
fuel cell. The boost pump is automatically started and
shut down during the engine start sequence. Shutdown
occurs at approximately 52% NG. It should be noted
that the pilot CROSSFEED switch must be in the
AFT TK position in order for the BOOST switch to
latch on.
Change 2 2-35
TM 1-1520-238-10
Table 2-1. Pilot Fuel Control Panel Switch Functions
Switch Position Result Indication
ENG 1 set OFF Energizes fuel crossfeed/shutoff None
valve of the No. 1 engine to the
closed position thus shutting off
fuel flow to that engine.
ENG 1 set ON Energizes fuel crossfeed/shutoff None
valve of the No. 1 engine to the
position commanded by the
CROSSFEED switch.
ENG 2 set OFF Energizes fuel crossfeed/shutoff None
valve of the No. 2 engine to the
closed position, thus shutting off
fuel flow to that engine.
ENG 2 set ON Energizes fuel crossfeed/shutoff None
valve of the No. 2 engine to the
position commanded by the
CROSSFEED switch.
CROSSFEED set FWD TK Both engines feed from the forward FWD cell fuel quantity indicators
fuel cell. register fuel decrease while AFT
cell indicators remain constant.
CROSSFEED set NORM ENG No. 1 feeds from the forward Both fuel quantity indicators
fuel cell; ENG No. 2 feeds from the register fuel decrease from
aft fuel cell. consumption.
CROSSFEED set AFT TK Both engines feed from the aft fuel AFT cell fuel quantity indicators
cell. register fuel decrease while FWD
cell indicators remain constant.
EXT TK switch set ON Pressurized air is made available to Both fuel quantity indicators
all external tanks for transfer of register fuel increase during fuel
fuel to the main fuel cells. transfer operation.
TRANS set TO FWD Fuel is being pumped from AFT cell AFT cell fuel quantity indicators
to FWD cell by the transfer pump. register fuel decrease while FWD
cell indicators register fuel
increase.
TRANS set TO AFT Fuel is being pumped from FWD FWD cell fuel quantity indicators
cell to AFT cell by the transfer register fuel decrease while AFT
pump. cell indicators register fuel
increase.
BOOST set ON Pneumatically driven boost pump BOOST PUMP ON segment of C/W
(in AFT cell) is delivering fuel to panel illuminates. (Crossfeed must
both engine CROSSFEED/ be set to AFT TK in order to latch
SHUTOFF VALVES. BOOST switch.)
2-36
TM 1-1520-238-10
2-23. Fuel System (Sheet 1 of 2)
2-37
TM 1-1520-238-10
Figure 2-23. Fuel System (Sheet 2 of 2)
2-38
TM 1-1520-238-10
Figure 2-24. CPG Fuel Control Panel
2.36.2 CPG Fuel Control Panel. Table 2-2 outlines
the effects of switch settings on the CPG fuel control
panel (fig 2-24). The following paragraphs contain a description
of fuel system provisions controlled by the
panel:
a. Override Switch (ORIDE). With the ORIDE
switch in the PLT position, only the pilot fuel control
panel switches have control of fuel system operation.
When the ORIDE switch is placed in the CPG position,
The CPG fuel control panel switches are enabled. The
switches that are not duplicated on the CPG FUEL
panel are still active on the pilot FUEL panel, (i.e.,
ENG 1, ENG 2 fuel switches, and EXT TK switch).
b. Transfer (TRANS) Switch. Operates the same
as the pilot TRANS switch (paragraph 2.36.1 d).
C. BOOST Switch. Operates the same as the pilot
BOOST switch (paragraph 2.36.1 e).
d. Tank Select (TK SEL) Switch. Operates the
same as the pilot CROSSFEED switch (paragraph
2.36.1 b).
Table 2-2. CPG Fuel Control Panel Switch Functions
Switch Position Result Indication
ORIDE set PLT Only the pilot fuel control panel is None
enabled.
ORIDE set CPG CPG Fuel control panel is enabled. None
TRANS switch See Table 2-1.
BOOST switch See Table 2-1.
TK SEL set FROM FWD See Table 2-1, CROSSFEED set
FWD TK.
TK SEL set NORM See Table 2-1, CROSSFEED set
NORM.
TK SEL set FROM AFT See Table 2-1, CROSSFEED set
AFT TK.
2-39
NOTE
TM 1-1520-236-10
2.36.3 Fuel Quantity Indicators. The pilot verticalscale
fuel quantity indicator (fig 5-1) indicates the
quantity (in pounds X 10) of fuel remaining in the forward
and aft fuel cells. A digital display at the bottom
of the indicator shows the combined total of remaining
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