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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT- DESCRIPTION AND OPERATION
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 1.  General
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 A.  The airplane is powered by two CFM56 turbofan engines mounted below the wing. The engines are individually supported in strut-mounted nacelles with mounts designed to absorb thrust, vertical and side loads and to allow growth of the engine due to thermal expansion. Refer to 71-21-00, Engine Mounts, for description of the mounts.
 B.  Engine components and accessories are accessible for maintenance and service operations by use of hinged removable fan cowl panels, hinged removable fan duct cowl and thrust reverser halves, and a removable forward fairing. Refer to 71-11-00, Engine Cowling, for description of the fan cowl panels and forward fairing. Refer to 78-31-00, Fan Thrust Reverser System, for description of the fan duct cowl and thrust reverser halves.
 C.  The major components installed on each engine in addition to the basic engine accessories include the constant speed drive, generator, hydraulic pump, and starter.
 2.  Engine (Fig. 1)
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 A.  The engine is a dual-rotor, axial flow turbofan of high compression ratio and high bypass ratio. The engine incorporates two multistage turbine-driven compressors utilizing concentric shafting. The integrated fan and low pressure compressor, consisting of one fan stage and three compressor (booster) stages is driven by a four-stage low pressure turbine. The nine-stage high pressure compressor is driven by a single-stage high pressure turbine. Refer to 72-00-00, Engine, for description of the basic engine and accessories.
 B.  The engine starting system provides the means for rotating the high pressure rotor (HPR) to establish airflow through the engine. Rotation of the HPR drives the engine fuel pump and main engine control and delivers metered fuel under pressure to the combustion chamber. The ignition system is a high energy capacitor discharge system consisting of two electrically and physically independent circuits serving separate igniter plugs.
 C.  The engine includes a complete self-contained oil system for lubrication and cooling of internal parts. Thrust reverser mechanisms are utilized at the engine fan discharge to provide a means of further decelerating the airplane during its landing roll. Various remote transmitting devices are installed on the engine to provide indication in the flight compartment of engine performance and condition.
 D.  A vent and drain system is mounted on the engine to collect and discharge drain fluids overboard. Refer to 71-71-00, Engine Vents and Drains, for description of the engine vent and drain system.
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 71-00-00
 ALL  ú ú C02 Page 1 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FORWARD FAIRING ENGINE INLET COWL THERMAL MOUNT ANTI-ICE (TAI) VALVE FORWARD
PRECOOLER CONTROL VALVE
PRECOOLER
IGNITION PRESSURE REGULATOR EXCITERSAND SHUTOFF VALVE
FUEL NOZZLES INLET COWL (20 PLACES)
T12 TEMPERATURE SENSOR
POWER MANAGEMENT CONTROL (PMC)
HIGH STAGE REGULATOR
ENGINE OIL TANK
HIGH STAGE N1 SPEED SENSOR
VALVE  BLEED AIR REGULATOR
FORWARD ENGINE MOUNT
THRUST LINK ASSEMBLY

FAN COWL PANEL
T2 TEMPERATURE
SENSOR

START
VALVE
TRANSFER GEARBOX (TGB)
ENGINE
STARTER
FAN DUCT COWL AND THRUST REVERSER
INLET COWL MAIN ENGINECONSTANT ACCESSORY CONTROL (MEC)
GENERATOR HYDRAULIC SPEED
GEARBOX
PUMP DRIVE
(AGB)(CSD)
Power Plant Component Location
Figure 1

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 71-00-00
 ALL  ú ú C01 Page 2 ú Feb 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - MAINTENANCE PRACTICES (OPERATION PROCEDURES)
　
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