S 862-102-N00
(5)
Do the engine shutdown procedure (AMM 71-00-00/201).
S 032-103-N00
(6)
Remove the drain plugs from the bottom of the engine oil tank and the bottom of the main gearbox.
(a) Let the engine oil drain to a slow drip (approximately 30 minutes).
S 432-104-N00
(7)
Install the drain plugs in the main gearbox and engine oil tank.
S 032-105-N00
(8)
Remove the accessory drive pad covers from the main gearbox.
S 622-106-N00
(9)
Spray the drive pads with engine oil.
S 432-107-N00
(10)
Install the accessory drive pad covers on the main gearbox.
S 972-108-N00
(11)
Make a record of the date of the preservation on a tag and attach it to the oil filler cap.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-03
ALL ú ú N01 Page 207 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 71-00-03-632-046-N00
3. Power Plant Depreservation
__________________________
A. References
(1)
AMM 12-13-03/301, Engine Oil - Servicing
(2)
AMM 29-11-05/401, Engine Driven Pump
(3)
AMM 71-00-00/201, Power Plant
(4)
AMM 72-61-07/401, Hydraulic Pump Rear Drive Oil Seal
(5)
AMM 78-31-00/201, Thrust Reverser System
B.
Access
(1)
Location Zone
412 Engine 1
422 Engine 2
432 Engine 3
442 Engine 4
(2)
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4
C.
Method I (8 to 30 Days)
S 552-047-N00
(1)
Remove the cover from the engine, if it was installed.
S 212-048-N00
(2)
Examine the main gearbox housing for corrosion caused by hydraulic fluid leaks.
(a)
If it is necessary, remove the hydraulic pump (AMM 29-11-05/401) to get better access to the main gearbox.
(b)
If any hydraulic fluid is found, replace the gearbox carbon seal (AMM 72-61-07/401).
S 612-049-N00
(3) Do this task: "Engine Oil - Servicing (Oil Replenishing)" (AMM 12-13-03/301).
NOTE: Do not do the Thrust Reverser Activation procedure after you
____ you do the oil servicing. This procedure will be done at a later time.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-03
ALL ú ú N01 Page 208 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 862-050-N00
(4)
Do the steps for the Periodic Engine Run in the task for the Power Plant Preservation (AMM 71-00-03/201).
S 282-079-N00
(5)
If the oil system was not drained, do the steps in the Engine Oil Analysis in the Power Plant Preservation (AMM 71-00-03/201) to examine the oil for water and acid contamination.
S 442-057-N00
(6)
Do this task: "Thrust Reverser Activation After the Ground Maintenance" (AMM 78-31-00/201).
D.
Method II (31 to 90 Days)
S 212-063-N00
(1) Examine the main gearbox housing for corrosion caused by hydraulic fluid leaks.
(a)
If it is necessary, remove the hydraulic pump (AMM 29-11-05/401) to get better access to the main gearbox.
(b)
If any hydraulic fluid is found, replace the gearbox carbon seal (AMM 72-61-07/401).
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