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POWER PLANT
Oil System
Flight Crew Operating Manual
CSP A--013
MASTER
E. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
L ENG OIL
PRESS
BATTERY
BUS 1 M1
Oil System Oil Pressure
Indications
R ENG OIL
PRESS
DC
ESSENTIAL 4 B11
OIL BYPS IND APU
B8
ENG OIL
PWR
BATTERY
DIRECT
5
B9
REV 56, Jan 31/03
Vol. 1 20--40--12
POWER PLANT
Oil System
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 20--50--1
REV 56, Jan 31/03
POWER PLANT
Fuel System
Flight Crew Operating Manual
CSP A--013
MASTER
1. FUEL SYSTEM
Fuel from the collector tanks is supplied to the respective engine fuel pump unit by a main
ejector or an electrical booster pump, through the engine fuel feed shutoff valve.
Engine fuel distribution is controlled by a gearbox-driven fuel pump unit and a mechanical
fuel control unit (FCU). Pressurized fuel from the centrifugal pump goes through the heat
exchanger and a filter then back to the fuel pump unit. The fuel/oil heat exchanger uses hot
engine oil to heat the combustion fuel and cold fuel to cool the engine oil.
The supply fuel pressure is then increased by the primary pump and then sent to the FCU
metering circuit and variable geometry (VG) actuator circuit. Fuel metered by the FCU is
then supplied to the combustion chamber via the fuel flow transmitter.
The FCU is a hydromechanical metering unit that supplies fuel in response to mechanical
commands from the thrust levers. During engine start and at low power settings the FCU
hydromechanically schedules the fuel to control N2 speed. At high power settings, the N1
amplifier trims the MFC fuel schedule. The FCU has two metering schedules, N2 speed
control and N1 speed control:
S N2 speed control -- At low power settings, the FCU hydromechanically controls N2 speed
relative to thrust lever position
S N1 speed control -- At takeoff, climb and cruise power, (with the speed switches selected
ON) the MFC electronically controls N1 above 79%.
NOTE
IfN2 speed control is used to set takeoff thrust (engine
speed switches OFF), APR thrust will be inhibited.
Takeoff thrust will be obtained at a lower power lever
angle than if N1 speed control is used. The thrust
levers will not always be aligned when fans speeds are
matched.
CAUTION
Do not set the speed switches on the engine control
panel to the OFF position when the thrust lever is
above 79% N1. This will cause a rapid increase of N2
speed and may cause the engine RPM and
temperature to exceed normal limits.
Eighteen dual-orifice (primary and secondary) fuel injectors are installed on each engine.
The primary orifice is used to spray fuel into the combustor at low power settings. At power
settings above idle, the secondary orifice is opened and both the primary and secondary
orifices spray fuel into the combustor.
REV 56, Jan 31/03
Vol. 1 20--50--2
POWER PLANT
Fuel System
Flight Crew Operating Manual MASTER
CSP A--013
Combustion fuel can be shut off by moving the thrust lever to the shutoff position or by
selecting the related engine fire push switchlight. Moving the thrust lever to the shutoff
position closes the FCU shutoff valve. The engine fire push switchlight closes the engine
fuel feed shutoff valve.
Fuel pressure is used to control and actuate the operability bleed valve and variable
geometry linkages for engine compressor surge and stall protection.
The operability bleed valve vents excess air overboard and the VG system varies the
position of the compressor inlet guide vanes and the first five stages of the stator vanes to
regulate air through the engine. Fuel metered by the FCU drives the VG actuators which
position the vanes open as engine speed increases and toward close as engine speed
decreases.
Fuel is also used to actuate and lubricate components within the fuel system.
Fuel that is not used for combustion is returned to the fuel system to provide motive flow
(venturi pressure) for the main and scavenge ejectors in the fuel tanks.
Vol. 1 20--50--3
REV 56, Jan 31/03
POWER PLANT
Fuel System
Flight Crew Operating Manual
CSP A--013
MASTER
Fuel Distribution System Schematic
Figure 20---50---1
FUEL
SHUT--OFF
VALVE
FUEL
INJECTORS
(QTY 18)
METERED
FUEL OUT
POP OUT
BUTTON IMPENDING
BYPASS
SENSOR
T
FUEL METERING UNIT
　
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