78-31-00
ALL ú ú N01 Page 25 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
DEPLOYTHRUST REVERSER
FEEDBACK LVDT
CONNECTION STOW
T/R DIRECTIONAL T/R ACTUATOR
ECONTROL VALVE SOLENOID RETRACT(RET)
RET
T/R
CONTROL
RETSYSTEM T/RINDICATION
T/R T/R ISOLATION VALVE
SLEEVE RETRACT FLOW CONTROL TEESYSTEM
PRESS
LH T/R DEPLOY
PROX SENSOR
EXT
T/R
HYDRAULIC
INDICATION
E
SYSTEM EXTEND (EXT) LH ACTR LOCKT/R ACTUATOR
POWER
WITH LOCK & FEEDBACKPIN
PROX SENSOR
LVDT
RTN
RETURN
EXT (RTN)
MANUAL
BYPASSVALVE PIN T/RSLEEVE EXTEND FLOW CONTROL TEE
T/R ACTUATOR MANUAL CRANK ADAPTOR
SAME AS T/R ACTUATOR ABOVE
T/R DIRECTIONAL
CONTROL VALVE SOLENOID
CONT
T/RINDICATIONP
SYSTEMSAME AS T/R ACTUATOR
T/RRH T/R DEPLOYWITH LOCK AND
PROX SENSOR
INDICATIONFEEDBACK LVDT
SYSTEM
T/R CONTROL SYSTEM T/RINDICATION
750 PSI
T/R FLEX
SYSTEM
ENG SHAFT
ISOLATIONRH ACTR LOCKVALVE PROX SENSOR
T/R ISLNHYDRAULICVALVE PRESS SW
VIEW E-E
SOLENOID SAME AS T/R ACTUATOR ABOVE
MANUAL CRANK ADAPTOR T/R IN STOW POSITION
PRESSURE
RETURN
Thrust Reverser Hydraulic System Schematic (Typical)
Figure 13
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78-31-00
ALL ú ú N01 Page 26 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(1)
When reverse thrust is selected in the flight compartment, hydraulic flow goes from the applicable left or right main hydraulic system via isolation valve, directional control valve and flow control tees as described in Thrust Reverser Control System (AMM 78-34-00/001). Hydraulic flow is first directed to the locking mechanism on the center hydraulic actuators. When the locks have disengaged, hydraulic flow is directed to the hydraulic actuators. The hydraulic actuators extend, which moves the translating sleeve to the reverse thrust position. As the translating sleeves move, blocker doors are turned by the door links into the fan exhaust flow path. Aft movement of the translating sleeves show the cascade vanes to the fan exhaust.
B.
Retraction
(1)
When forward thrust is selected, the directional control valve routes hydraulic flow to the rod ends of the hydraulic actuator. The hydraulic actuators retract, which moves the translating sleeves to the forward thrust (cruise) position. As the translating sleeves move forward, cascade vanes are moved in the cavity in the translating sleeves and blocker doors are turned out of the fan exhaust flow path.
C.
Open and Close the Thrust Reverser - Hand Pump Method
(1)
Attach the hand pump to the applicable quick-release-manifold installed on the torque box of the therust reverser below the left and right fan cowl panels. When the hand pump is operated, it moves fluid to the opening actuator, which lifts the thrust reverser. Use the hold open rod when the reverser is open to the necessary position.
(2)
It is not recommended to close the two thrust reversers at the same time.
(3)
When you close the thrust reverser, use the hand pump to remove the force on the hold open rod. Disconnect the rod and put it back in its usual position. Open the return valve on the hand pump to let the hydraulic fluid back into the pump reservoir. The weight of the reverser will cause it to close.
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