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pressure (LP) fan driven by a two stage turbine and a ten stage high pressure (HP) compressor,
driven by a two stage turbine. The HP spool provides an external drive for the accessories mounted
on the accessory gearbox.
GF1810_001
HP TURBINE
LP COMPRESSOR (FAN) HP COMPRESSOR LP TURBINE
ACCESSORY GEARBOX
All air entering the engine air intake passes through the LP compressor and is divided into two main
flows, the bypass and core airflows. The core airflow passes through the HP compressor to the
annular combustion chamber, which supplies the engine with its fuel requirements. The core airflow
then flows through two stages of HP turbines and two stages of LP turbines into the forced mixer to
mix with bypass air.
The Bypass air passes through the fan outlet guide vanes along the bypass duct to meet with the
core airflow. The combined airstream is exhausted to atmosphere.
GF1810_002
LP COMPRESSOR
HP COMPRESSOR
INTAKE COWL
ACCESSORY
BYPASS DUCT
EXHAUST CONE
EXHAUST NOZZLE
HOT STREAM
(CORE GAS)
COLD STREAM
(BYPASS AIR)
FORCED MIXER
LP TURBINE
HP TURBINE
COMBUSTION
CHAMBER
AIR INLET
ANNULAR
GEARBOX
POWER PLANT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
18−10−2
ENGINE MODULES
The engine is made up of eight modules as follows:
FAN CASE
INTERMEDIATE CASE
HP COMPRESSOR
HP TURBINE AND COMBUSTOR
FAN ASSEMBLY
ACCESSORY GEARBOX
BYPASS DUCT LP TURBINE
AND SHAFT
GF1810_003
· Fan assembly − Compresses the air entering the engine inlet cowl and feeds a percentage of it
to the core, while the bypass air provides a major portion of the engine’s thrust.
· Fan case − Provides containment in the event of fan blade failure and noise attenuation.
· Intermediate case − Provides a fixed structure for rotating systems and houses the drive for
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 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
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
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航空翻译 www.aviation.cn
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