- a hydraulic control unit (HCU) with:
 a pressurizing valve
 a directional valve
 a pressure switch
 a flow limiter
 a filter and clogging indicator
 a bleed valve
 a check valve restrictor
 a mechanical inhibition

 - associated to each four pivoting blocker doors:
 an actuator including secondary lock
 a stow switch

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R R  Thrust Reverser Component Location Figure 001
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R R  Aircraft Integration - Command Signals Figure 002
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R R  Hydraulic Supply Figure 003
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 a deploy switch
 a primary lock

 - and associated piping and electrical harnesses

 - a Shut-Off Valve (SOV) and associated filter (located in the pylon)

R 3. Operation
_________ R (Ref. Fig. 002, 003)
R A. Thrust Reverser Stow Position

R (1) When the thrust reverser function is not selected the thrust reverser
R blocker doors are locked stowed.
R Four locks, one per blocker door locks the doors in the stowed
R position and assure the primary lock.
R A redundant secondary lock is provided for stowed position by a
R system of claws inside each blocker door actuators.
R The thrust reverser system using hydraulic power for stowing or
R deploying sequence is isolated and depressurized through the HCU and
R the SOV. The depressurisation is checked by the HCU pressure switch.
R The stow and lock position is checked on each blocker door by a stow
R switch. Each switch is dual and includes two cells, one dedicated to
R each channel of the HCU.

R (2) Autorestow
R The autorestow function is activated by the ECU to close and lock the
R thrust reverser blocker doors in case of abnormal unstowed position
R detection. This function is active only on ground and can be
R commanded only twice.

R B. Thrust reverser deploy sequence
R Deploy sequence is only allowed on ground after actuation of the throttle
R control lever and requires actuation logic:
R - One ECU channel operating with its associated throttle reverse signal.
R - SOV opening through the SEC and the static relay.
R - Main gear compressed signal from at least one LGCIU.
R - Throttle lever angle (TLA) reverse signal from at least one second.
R Before the transit completion, the ECU sets the reverse idle thrust.
R
R Deploy sequence after actuation logic passed:
R - The ECU allows the opening of HCU pressurizing valve and pressurizes
R the HCU while the SOV is opened through the SEC and the static relay.
R - The HCU pressure switch sends a HCU pressurized signal to the ECU.
R - The EIU and the ECU allow the opening of the HCU directional valve and
R pressurize the first primary lock.
R - The primary locks are released in sequence.
R - Consequently stow switches sends to the ECU an unstowing information
R signal.

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R  After primary locks disengagement , the HCU provides the actuators with 
R  the hydraulic power. 
R  - The secondary locks included in each actuator are released. 
R  - The actuators deploy the pivoting blocker doors. 
R  - The deploy switches send to the ECU a full deployment information 
R  signal. 
R  - When the deploy switches are pressed the ECU closes the HCU 
R  pressurizing valve to prepare the stow sequence and allows Max reverse 
R  thrust to be applied. 
R  C. Thrust Reverser Stow Sequence 
R  Once the four deploy switches are pressed the ECU closes the HCU 
R  pressurizing valve in order to prepare the stow sequence by arming the 
R  primary locks. 
R  According to the new throttle control lever position, the SOV is closed 
　
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