-
The Air Data and Inertial Reference Unit (ADIRU),
which provides Mach number to the ECU.

-
The Hydraulic system, including the Thrust Reverser
Shut-Off Valve (TRSOV) and the Hydraulic Control
Unit (HCU).

- The C-ducts and blocker doors with their related
actuators and deploy and stow switches.

EFG

CTC-201-232-01
EFFECTIVITY
78-30-00 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
INDICATING SYSTEM
Thrust reverser.
When the thrust reverser is selected, indication is available for the crew on the upper ECAM system.
In deploy mode:
-A box with REV appears when reverse is selected.
This box is displayed in the N1 dial indication.

-
The REV indication is displayed in amber colour
when the throttle is in the reverse range and the
blocker doors are not 95% deployed.

-
The REV indication is displayed in green colour when
the doors are fully deployed.

In stow mode:
-
The REV indication is still displayed during the stow
operation.

-
The REV indication is displayed in amber colour
when the doors are restowed.

EFG

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EFFECTIVITY
78-30-00 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
EFG THRUST REVERSER  CFM56-5B  TRAINING MANUAL 
Thrust reverser logic. 
Based upon the T/R status, the ECU will apply full reverse thrust only if: 
- The four doors are detected open. - The engine is running. - The aircraft is on ground. 
In transient, idle speed is selected. 
The ECU receives signals from aircraft and engine systems, such as the TRA position, flight/ground status and position of the stow and deploy switches. Depending on these inputs, the T/R logic within ECU will either: 
- Inhibit the thrust reverser, or. - Allow forward thrust, or. - Allow reverse thrust. 
A test is available through the MCDU menus, to check some T/R components. To perform this test, the conditions are: 
- Aircraft on ground. - Engine not running. 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION  78-30-00 ENGINE SYSTEMS  Page 10 Jan 03 

EFG
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EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION CTC-201-234-01
　
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