TM 55-1510-221-10
1. STANDBY PUMP switch (#1 engine)
2. FUEL quantity indicator (#1 engine)
3. FUEL QUANTITY gaging system control switch
4. FUEL quantity indicator (#2 engine)
5. STANDBY PUMP switch (#2 engine)
6. AUX TRANSFER OVERRIDE switch (#2 engine)
7. CROSSFEED valve switch
8. AUX TRANSFER OVERRIDE switch (#1 engine)
Figure 2-14. Fuel Management Panel
a.
Engine Driven Boost Pumps.
Engine operation using only the engine-
driven primary (high pressure) fuel pump
without standby pump or engine-driven
boost pump fuel pressure is limited to 10
cumulative hours. This condition is indi-
cated by illumination of either the No. 1
or No. 2 FUEL PRESS warning annuncia-
tor lights and the simultaneous illumina-
tion of both MASTER WARNING lights.
Refer to Chapter 9. All time in this cate-
gory shall be entered on DA Form
2408-13 for the attention of maintenance
personnel.
A gear-driven boost pump, mounted on each
engine supplies fuel under pressure to the inlet of
the engine-driven primary high-pressure pump for
engine starting and all normal operations. Either the
engine-driven boost pump or standby pump is capa-
ble of supplying sufficient pressure to the engine-
driven primary high-pressure pump and thus main-
tain normal engine operation.
AP 006447
b.
Standby Fuel Pumps. A submerged, electri-
cally-operated standby fuel pump, located within
each nacelle tank, serves as a backup unit for the
engine-driven boost pump. The standby pumps are
switched off during normal system operations. A
standby fuel pump will be operated during crossfeed
operation to pump fuel from one system to the
opposite engine. The correct pump is automatically
selected when the CROSSFEED switch is activated.
Each standby fuel pump has an inertia switch
included in the power supply circuit. When sub-
jected to a 5 to 6 G shock loading, as in a crash situ-
ation, the inertia switch will remove electrical power
from the standby fuel pumps. The standby fuel
pumps are protected by two 10-ampere circuit
breakers placarded STANDBY PUMP No. 1 or
No. 2, located the overhead circuit breaker panel (fig.
2-26) and four 5-ampere circuit breakers (2 each in
parallel) on the hot battery bus.
c. Fuel Transfer Pumps. The auxiliary tank
fuel transfer system automatically transfers the fuel
from the auxiliary tank to the nacelle tank without
pilot action. Motive flow to a jet pump mounted in
the auxiliary tank sump is obtained from the engine
fuel plumbing system downstream from the engine
driven boost pump and routed through the transfer
control motive flow valve. The motive flow valve is
energized to the open position by the control system
2-29
