S 492-011
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(12)
Do this task: "Extended Leading Edge Flap Deactivation and Safety Lock Installation" (AMM 27-81-00/201).
S 862-012
(13)
Do this task if electrical power is not necessary: "Electrical Power Removal" (AMM 24-22-00/201).
S 862-013
(14)
Do this task: "Pneumatic Power Removal" (AMM 36-00-00/201).
S 862-014
(15)
Do this task if hydraulic power is not necessary for hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).
E.
Remove the Power Drive Unit
S 032-015
(1)
Disconnect these primary (pneumatic) drive power electrical
connectors (13):
(a)
DM876 and DM885 (PDU No. 1)
(b)
DM878 and DM883 (PDU No. 2)
(c)
DM879 and DM882 (PDU No. 3)
(d)
DM880 and DM881 (PDU No. 4)
S 032-016
(2)
Disconnect these alternate (electrical) drive power electrical connectors (33):
(a)
DM876B and DM885B (PDU No. 1)
(b)
DM878B and DM883B (PDU No. 2)
(c)
DM879B and DM882B (PDU No. 3)
(d)
DM880B and DM881B (PDU No. 4)
(3)
Remove the power drive unit (PDU) (Fig. 201):
S 022-017
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747-400
MAINTENANCE MANUAL
WARNING: MAKE SURE THAT THE APPLICABLE (LEFT OR RIGHT) PNEUMATIC
_______ MANIFOLD PRESSURE GAGE IS AT ZERO BEFORE YOU TRY TO DISCONNECT THE SYSTEM. IF YOU DISCONNECT THE SYSTEM WHEN THERE IS PRESSURE, INJURY CAN OCCUR.
(a)
Loosen the retainer (14) on the pneumatic line.
(b)
Remove the retainer and sleeve (14) from the PDU.
WARNING: MAKE SURE THAT YOU HOLD THE DRIVE SHAFT WHEN YOU DISENGAGE
_______ THE COUPLING. THE VARIABLE CAMBER FLAPS CAN MOVE SUDDENLY IF YOU DO NOT HOLD THE DRIVE SHAFT. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(c)
Loosen the coupling (41).
(d)
Disengage the drive shaft (32) from each side of the PDU (Detail B, Fig. 201).
(e)
Remove the mounting bolts (17 and 28).
(f)
Remove the PDU (4, 5, 6, or 7).
S 682-018
CAUTION: MAKE SURE TO DRAIN ALL THE OIL FROM THE POWER DRIVE UNIT (PDU)
_______ WHEN YOU REMOVE THE PDU FOR TRANSPORTATION OR STORAGE. PERMIT APPROXIMATELY 20 TO 30 MINUTES FOR THE ALL THE OIL TO DRAIN FROM THE PDU. IF THERE IS OIL IN THE PDU, THE OIL CAN DRAIN ON THE SERVOMOTORS AND CAUSE DAMAGE TO EQUIPMENT.
(4)
Drain the oil from the PDU:
(a)
Remove the plugs (22 and 25).
(b)
Attach tags on the PDU to identify there is no oil in the PDU.
(c)
Install the plugs (22 and 25) and the o-rings (23 and 26).
TASK 27-81-03-402-019
3. Power Drive Unit Installation
_____________________________
A. Special Tools and Equipment
(1)
17MIT65B04017 Leading Edge Flap Drive Unit Lock
(2)
6TE65B00114 Variable Camber Flaps Rigging Bar
B.
Consumable Materials
(1)
D00013 Grease - MIL-G-23827
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747-400 MAINTENANCE MANUAL
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