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(4) Do these steps to open the bypass valve (of the isolation valve) only if you will manually extend or retract the thrust reverser:
NOTE: The bypass valve must be open before you manually extend or
____ retract the thrust reverser. This will prevent a hydraulic lock, which can prevent the movement of the thrust reverser. But, you must close the bypass valve again if you will remove the thrust reverser components or hydraulic tubing (after you extend or retract the thrust reverser). If you do not close the bypass valve again, leakage of the hydraulic fluid will occur when you remove the components or tubing.
(a)
Push in the bypass valve lever to open the bypass valve of the isolation valve.
(b)
Install the streamer pin to hold the bypass valve lever in the open position.
(c)
Install the hitch pin in the streamered pin.
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(5)
After you complete the deactivation procedure, make sure the REMOVE-BEFORE-FLIGHT streamer hangs out of the strut hydraulic bay.
E.
Deactivate the thrust reverser sleeves (Fig. 208)
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(1)
Open the fan cowl panels (AMM 71-11-04/201).
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(2)
Make sure the thrust reverser sleeves are fully retracted.
(a) If it is necessary, manually move the thrust reverser to the fully stowed position (AMM 78-31-00/201).
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(3) Do these steps for the deactivation of the thrust reverser sleeves:
(a)
Remove the sleeve deactivation pin (with the REMOVE-BEFORE-FLIGHT streamer) from the tube support structure on the torque box of the thrust reverser.
(b)
Let the REMOVE-BEFORE-FLIGHT streamer hang down from the sleeve deactivation pin.
(c)
Remove the screw plug from the outer surface of the thrust reverser sleeve (near the center locking actuator).
(d)
Install the screw plug (from the outer sleeve surface) on the tube support structure of the thrust reverser.
(e)
Install the sleeve deactivation pin in the hole in the outer surface of the thrust reverser sleeve (where the screw plug was before you removed it).
(f)
Do the same steps (above) for the other thrust reverser sleeve on the applicable engine.
NOTE: You must install the sleeve deactivation pins in each
____ of the two thrust reverser sleeves on each applicable engine.
TASK 78-31-00-442-121-N00
11. Thrust Reverser Activation Following Ground Maintenance (Fig. 207)
_______________________________________________________
A. General
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE B
ACTUATOR HYDRAULIC NON-LOCKING LOWER
SEE A ACTUATOR HYDRAULIC LOCKING CENTER SEE C FWD
C LEFT SIDE INSTALLATION (RIGHT SIDE IS EQUIVALENT)
STREAMER STREAMER CLIP
SPOT BLACK DEACTIVATED ACTIVATED GSE HOIST SLEEVE ONLYPOINT PLUG
B GROUND DEACTIVATION PIN C
Figure 208 Thrust Reverser Sleeve Deactivation for Ground Maintenance
M49513
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WARNING:_______USE THIS TASK AFTER GROUND MAINTENANCE ONLY. DO NOT USE IT AFTER THRUST REVERSER DEACTIVATION FOR FLIGHT DISPATCH. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
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