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compression, for Air Conditioning/Pressurization, Cowl and Wing anti-icing and
engine starts.
The engine oil system consists of a lubrication system, a heat management system and
an oil replenishment system.
The fuel system consists of a low-pressure system and a high-pressure system. Fuel is
supplied from the airplane fuel system via AC and/or DC fuel pumps and enginedriven
fuel pumps.
Thrust management is controlled throughout all phases of operation by the Full
Authority Digital Electronic Control (FADEC). An Electronic Engine Controller
(EEC) is the major part of the FADEC, interfacing between the airplane and the
engine.
Primary engine indications are displayed on EICAS and secondary indications on the
STATUS page.
Autothrottle is controlled by the autothrottle computer, located in the IAC, and sends
signals to FADEC via the throttle, for thrust commands.
Starting is initiated through the FADEC, to provide normal ground/air starts, alternate
ground/air starts, wet and dry motoring and continuous ignition. Starting can also be
performed manually.
17-2 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
The thrust reverser system is operated by the airplane hydraulic system and is
controlled by the EEC.
Vibration monitoring system provides signals indicating N1 (Fan) and N2 (HP
compressor) vibration levels on each engine.
Fire detection is provided by dual element sensor assemblies connected in series to
provide two independent sensing loops. Two fire bottles are located at the rear of the
airplane.
DESCRIPTION
ENGINE ASSEMBLY AND AIRFLOW
The BR710A2-20 engine contains two main rotating assemblies (spools), a singlestage
low-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.
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.
GX_17_018
LP Compressor
(fan)
Accessory
Gearbox HP Compressor HP Turbine
LP Turbine
For Training Purposes Only
Sept 04
17-3
P I LOT T R A I N I N G GU I D E
POWER PLANT
ENGINE MODULES
The engine is made up of eight modules as follows:
GX_17_019
COLD STREAM
COLD STREAM
HOT STREAM
LP Compressor HP Compressor
Annular
Combustion
Chamber
HP Turbine
LP Turbine Forced
Mixer
AIR
INLET
Intake
Cowl
Accessory
Gearbox
Bypass
Duct
Exhaust
Cone
Exhaust
Nozzle
GX_17_020
FanAssembly
Intermediate
Case
Fan-Case
Accessory Gearbox
Bypass Duct
HPTurbine and
HP Compressor Combustor
LP Turbine
and Shaft
17-4 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
• 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
anti-icing
• 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
　
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