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sleeves are fully deployed rearward, thus enabling the pivoting blocker doors to forward divert the fan
flow through the cascades.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST REVERSER SYSTEM
A318/A319/A320/A321 FLEET DSC-70-70 P 2/12
FCOM 19 AUG 10
The translating sleeves are hydraulically-actuated (ENG 1 : Green circuit, ENG 2 : Yellow circuit).
The associated FADEC controls the thrust reverser system. Each FADEC channel performs control
and monitoring functions. The systems for the two engines are independent of each other.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST REVERSER SYSTEM
A318/A319/A320/A321 FLEET DSC-70-70 P 3/12
FCOM 19 AUG 10
The thrust reverser system on each engine has :
A Hydraulic Control Unit (HCU), which controls the hydraulic ‐ fluid flow to the thrust reverser
actuators ;
‐ A hydraulic shutoff valve, which allows hydraulic pressure to the HCU.
‐ 4 hydraulic actuators ;
‐ 1 flexible shaft (divided into 3 parts, each of which are connected to the actuators) to synchronize
the operation speed of the actuators ;
‐ 2 linear variable differential transducers, which monitor and transmit the reverser position to the
EEC ;
‐ 2 proximity switches, to monitor whether the sleeves are locked or not.
GENERAL
Applicable to:
, ,
MSN
The aircraft reverses engine thrust by using four pivoting blocker doors on each engine to deflect the
fan airstream.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST REVERSER SYSTEM
A318/A319/A320/A321 FLEET DSC-70-70 P 4/12
FCOM 19 AUG 10
A hydraulic door jack positions each door.
‐ The green circuit powers the doors on ENG 1.
‐ The yellow circuit powers the doors en ENG 2.
The associated FADEC controls the thrust reverser system. Each FADEC channel performs control
and monitoring functions. The systems for the two engines are independent of each other.
The thrust reverser system on each engine has :
‐ 4 actuators,
‐ 4 latches,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST REVERSER SYSTEM
A318/A319/A320/A321 FLEET DSC-70-70 P 5/12
FCOM 19 AUG 10
‐ Door position switches,
A Hydraulic ‐ Control Unit (HCU) that :
• Pressurizes the thrust reverser hydraulic system,
• Regulates the speed of the blocker doors, and
• Supplies actuators with hydraulic power.
‐ A hydraulic shutoff valve which allows hydraulic pressure to the HCU.
Each pivoting door moves independently (the doors are not synchronized).
The total actuation time is less than two seconds.
ACTUATION LOGIC
Applicable to: ALL
Deployment requires :
‐ One FADEC channel, operating with its associated throttle reverse signal ;
‐ Right and left main gear compressed signal from the corresponding LGCIUs ;
‐ A Thrust Lever Angle (TLA) reverse signals from at least one Spoiler Elevator Computer (SEC).
Before deployment is completed, the FADEC sets reverse idle thrust on the engine that is having its
thrust reversed.
PROTECTION
Applicable to: MSN
4566,,,
‐ IDLE PROTECTION
The FADEC will automatically select the thrust to idle :
• In case of inadvertent thrust reverser deployment (while thrust reversers are commanded stowed),
as soon as the thrust reverser feedback position is above 15 % deployed (thrust decreasing
toward idle, when the detected position is between 10 % and 15 % ).
• In case of inadvertent thrust reverser stowage (while thrust reversers are commanded deployed),
as soon as the thrust reverser feedback position is below 78 % deployed (thrust decreasing toward
idle between 90 % and 78 % ).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST REVERSER SYSTEM
A318/A319/A320/A321 FLEET DSC-70-70 P 6/12
FCOM 19 AUG 10
PROTECTION
Applicable to:
, ,
MSN
‐ AUTO RESTOW FUNCTION
The FADEC will automatically command the reverse to stow, if at least one door is unstowed and
reverse thrust is not selected while the engine is running.
Auto restow is totally inhibited in flight, and on ground, with N1 greater than 70 %.
‐ IDLE PROTECTION
The FADEC will automatically select idle thrust if reverse thrust is not selected and :
• The four doors are detected unstowed, or
• At least one door is detected unstowed, and hydraulic pressure is detected in the HCU
(downstream of the pressurizing valve), or
　
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