Power Plant CFM 56 System Component Location

POWERPLANT SYSTEM COMPONENT LOCATION

SYSTEM OVERVIEW

The CFM56-5B engine is a dual-rotor, variable stator, high-bypass-ratio

turbo-fan power plant. The CFM56-5B can power all aircraft types of

the Single Aisle family. CFM56-5B engines are available in several thrust

ratings.

All the engines have the same basic configuration. A programming plug

on the Electronic Control Unit (ECU) changes the available thrust.

The power plant installation includes the engine, the engine inlet, the

exhaust, the fan cowls and the reverser assemblies. The pylon connects

the engine to the wing structure. The engine is attached to the pylon by

forward and aft mounts.

THRUST REVERSER SYSTEM

The reverse thrust is controlled by the ECU. A manual selection of

the reverse is done when the flight crew lifts the latching levers on

the throttle control levers. The reverse thrust command is sent to the

ECU and the Engine Interface Unit (EIU). The signal from the ECU

to the directional valve is supplied to an inhibition relay controlled

by the Engine Interface Unit (EIU) in relation to the position of the

throttle control lever.

In relation to commands from the ECU, a Hydraulic Control Unit

(HCU) supplies hydraulic power to operate the thrust reverser. The

thrust reverser uses 4 hydraulically operated pivoting blocker doors

to redirect the engine fan airflow.

COMPONENT LOCATION

The engine system components are at the following locations.

FADEC

The ECU is on the RH side of the fan case. The FADEC alternator is

on the gearbox.

STARTING

Two ignition boxes are on the RH side of the engine core. The air

starter is on the RH side of the gearbox rear face.

FUEL

The primary components of the fuel system are installed on the LH

side of the fan compartment.

The fuel pump is operated by the gearbox. The Hydro-Mechanical

Unit (HMU) and the filter are installed with the pump.

AIR

The next picture shows the compressor airflow control system, the

turbine clearance control system and the transient bleed valve system.

OIL

The oil tank is on the LH side of the fan case.

The lubrication unit is operated by the gearbox.

THRUST REVERSER

The hydraulic shut-off valve is on the forward part of the pylon. The

HCU is installed on the forward part of the RH 'C' duct.

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