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the AGB.
· HP Compressor − Provides a pressurized airflow to the combustion chamber for combustion
and cooling purposes and pressurized air for ECS and Wing and Cowl antiicing.
· HP Turbine and combustion chamber − The two stage HP turbine drives the HP compressor .
The combustion chamber mixes fuel and air, for an optimum mixture, for maximum efficiency.
· LP Turbine and shaft − Provides the LP turbine shaft which drives a two stage LP turbine that
drives the LP compressor (fan).
· Accessory Gearbox (AGB) − Transmits the motoring force from the engine to the accessories
mounted on the AGB. The AGB also transmits motoring from the air starter to the engine
during start/crank procedures. The AGB also houses the integral oil tank.
· Bypass duct − Provides a streamlined path for the fan bypass airflow and supports the thrust
reverser unit.
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−3
ENGINE BLEED AIR SYSTEM
The pneumatic system supplies compressed air for Air Conditioning and Pressurization, Ice and Rain
Protection and Engine starting. The pneumatic air supply normally comes from the engines (inflight)
and the APU or a high pressure ground air supply unit (on the ground).
GF1810_004
APU
ENGINES
GROUND
SOURCE
BLEED
AIR
SYSTEM
BLEED
MANAGEMENT
CONTROLLER
AIR
CONDITIONING
SYSTEM
ENGINE
STARTING
ANTIICING
SYSTEM
DISTRIBUTION EICAS
INDICATING
The engine bleed air system is controlled during all phases of operation by two Bleed Management
Controllers (BMC).
The BMC selects air from either the low pressure port (5th stage) or the high pressure port (8th
stage) depending on the demand. Under normal operation (inflight), the air is selected from the 5th
stage of compression. When the airflow is insufficient, the BMC will select the 8th stage of
compression.
L and R ENG BLEED AIR selection, AUTO or ON, is accomplished via the BLEED/AIR
COND/ANTIICE
panel on the overhead panel. A crossbleed valve (CBV) is installed between the left
and right pneumatic ducts, which can be opened, automatically by the BMC or manually, to provide
bleed air for engine starting. The APU is normal source of bleed air used for engine starting.
GF1810_005
XBLEED
AUTO
CLSD OPEN
L ENG BLEED
AUTO
OFF ON
R ENG BLEED
AUTO
OFF ON
APU BLEED
AUTO
OFF ON
For more information on ECS, see Chapter 2 AIR CONDITIONING AND PRESSURIZATION. For
more information on cowl and wing antiicing,
see Chapter 14 ICE AND RAIN PROTECTION.
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−4
ENGINE OIL SYSTEM
The function of the oil system is to lubricate and cool the engine bearings and gears. The system is a
full flow recirculating type.
The oil for the engine is stored in a tank, which is an integral part of the accessory gearbox. An oil
pump takes the oil from the tank to supply the front bearing chamber, the rear bearing chamber and
the accessory gearbox, via an oil pressure filter and a fuel cooled oil cooler (FCOC). An oil
replenishment tank is located in the aft equipment bay.
GF1810_006
MCD MCD MCD
R
PRV PRV
PRESSURE
FILTER
OIL
REPLEN
TANK
DEAERATOR
PRV
VENT
PRESSURE
PUMP
DIFFERENTIAL
PRESSURE
TRANSDUCERS
AIR OVERBOARD REAR
BEARING
CHAMBER
FRONT
BEARING
CHAMBER
ACCESSORY
GEARBOX
VENT
VENT VENT
SCAVENGE
OIL TEMPERATURE PUMP
BULB
R
DIFFERENTIAL
PRESSURE SWITCH
QUANTITY
TRANSMITTER
POPOUT
INDICATOR
MAGNETIC CHIP
DETECTOR
FLOW
RESTRICTOR
PRESSURE RELIEF
VALVE
STRAINER
FCOC
BREATHER
T
The oil quantity transmitter provides indication to the STATUS page 0.8 ENG 12.3 and will
display an OIL LO QTY message if the oil quantity is low.
The pump supplies pressure to move the oil to the bearings and drive gear and to return it to the
tank. The oil pressure transducer provides an indication of the pressure between the oil feed and
scavenge lines and displays it on EICAS. 81 OIL PRESS 81
If the oil pressure is low, while the engine is running, an OIL LO PRESS message is displayed on
EICAS. 23 OIL PRESS 81
Oil is fed to the pressure filter. The filter removes debris prior to delivery to the bearing/gears. A
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