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AIRPLANE HYDRAULIC
RETURN AND SUPPLY
EEC
HYDRAULIC
ELECTRIC
TERTIARY
LOCK
17-66 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
REVERSE THRUST OPERATION
Exhaust
Nozzle
Lower Door
Upper Door
Door Kicker
Plate
Actuators
Exhaust
Cone
Exhaust Unit
Fixed Structure
Door
Pivots
Cowl Door
Thrust Reverser
Deployed- Reverse Thrust
Normal Flight
Forward Thrust-
Reverser Stowed
GX_17_077
For Training Purposes Only
Sept 04
17-67
P I LOT T R A I N I N G GU I D E
POWER PLANT
REVERSER COMPONENTS
Isolation Control Unit
The isolation control unit controls the hydraulic system pressure to the thrust reverser
system.
DIRECTIONAL CONTROL UNIT
The directional control unit controls hydraulic pressure to the upper and lower door
actuators to provide the deploy force.
A pressure switch sends a signal to the directional control unit and through the
directional control unit to the upper and lower door actuators. This causes an overstow
of the doors to enable unlatching of the primary locks.
GX_17_078
Note:
The isolation control unit
is airframe-mounted
(not illustrated)
Upper
Actuator
Upper Tertiary
Lock
Primary Lock
Lever and
Actuator
Lower
Actuator
Lower Tertiary
Lock
Primary Lock
Lever and Actuator
Upper Door
Lower
Door
LVT’s
Stow Switches
(two per door)
GX_17_079
STOWED OVERSTOW
17-68 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
The unit contains the directional control valve which is controlled by a solenoid valve.
The solenoid valve is controlled from thrust lever microswitches and WOW and wheel
spin up signals. When the solenoid is energized, a deploy valve opens allowing
hydraulic pressure to sequentially release the two primary locks (hold doors closed
during flight).
Through the WOW or wheel spin up signal two tertiary locks (prevent uncommanded
thrust reverser deployment) will retract and move the directional control valve to the
deploy position.
GX_17_080
Upper Door
Upper Door
Catch
Latching
Lever
Lower Door
Catch
Lower Door
Primary Lock
Actuator
FWD
GX_17_081
Tertiary Locks
For Training Purposes Only
Sept 04
17-69
P I LOT T R A I N I N G GU I D E
POWER PLANT
REVERSE THRUST LEVERS
The reverse thrust lever microswitches and interlock baulk switches will not allow the
engine to increase reverse thrust until the upper and lower doors are deployed. REV
icons are displayed on N1 display, to indicate position of doors and reverser status.
In the event that a thrust reverser should become unlocked, an EICAS message will be
displayed, an aural warning is generated and the thrust is retarded to idle regardless of
thrust lever position. Should the door open, a red REV icon will be shown in the N1
gauge.
7O.O
T/O
N1
7O.O
26.O
T/O
N1
26.O
26.O
T/O
N1
26.O
GX_17_082
TRANSIT
DEPLOYED
TRANSIT
REVERSE THROTTLE LEVER
INTERLOCK BAULK POSITION
REVERSE THRUST INCREASE
REV REV
REV REV
REV REV
26.8
T/O
N1
7O.O L REVERSER UNLKD
GX_17_083
LEFT
REVERSER
UNLOCKED
REV
17-70 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
REVERSER SYSTEM LOCKOUT
In the event that a reverser fails (inoperative), the affected reverser can be locked out.
Each door can be fixed in the closed position by an inhibition bolt and by use of a
manual inhibit lever on the isolation control unit.
When fitted, the red bolts will protrude above the cowl surface and can be seen by the
crew on walkaround. The bottom bolt is located at approximately the six o’clock
position and the top bolt at the 12 o’clock position. The EICAS message will remain
posted, but can be scrolled out of view.
L REVERSER FAIL
GX_17_084
GX_17_085
Actuator Front
Mount and
Lock-Out Fitting
Kicker
Plate
Fixed
Structure
Upper
Door
Inhibition
Bolt
Inhibition
Bolt
SIDE VIEW OF LOCK-OUT
BOLT POSITION
For Training Purposes Only
Sept 04
17-71
P I LOT T R A I N I N G GU I D E
POWER PLANT
POWER PLANT EICAS MESSAGES
　
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