(a)
Loosen the clamp (9) that attaches the flexible hose (10) to the breather adapter (1).
(b)
Remove the hose (10) from the breather adapter (1).
(c)
Remove the two nuts (8) and the washers (7) that attach the breather adapter (1) to the accessory gearbox (4).
(d)
Remove the breather adapter (1) and the transfer tube (2) at the same time.
(e)
Remove the transfer tube (2) from the breather adapter (1).
(f)
Remove the packings (5 and 6) from the breather adapter (1) and the transfer tube (2). 1) Discard the packings (5 and 6).
S 024-004
(3)
Remove the carbon seal (1) from the breather adapter (2) (Fig. 402):
(a)
Install the breather adapter (2) in the PWC41445 support.
(b)
Use the puller to remove the carbon seal (1) from the breather adapter (2). 1) Discard the seal (1).
TASK 49-27-01-404-020
3. Accessory Gearbox Breather Adapter Carbon Face Seal Installation (Fig. 401)________________________________________________________________
A. Special Tools and Equipment
(1) PWC41344 Drift - Pratt and Whitney Canada Inc
1000 Marie Victorin
Longueuil, Quebec
Canada J4G 1A1
Attention: Parts Division
OR
Kell-Strom Tool Company Inc 214 Church Street Wethersfield, CT 06109 USA
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A
747-400
MAINTENANCE MANUAL
(2)
PWC41445 Support - Pratt and Whitney Canada Inc
B.
Consumable Materials
(1)
D00418 Oil - Aircraft Turbine Engine
C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Breather Adapter | 49-27-01 | 01 | 60 | | | 5 | Packing | 49-27-50 | 01 | 55 | | | 6 | Packing | 49-27-01 | 01 | 65 | | 402 | 1 | Face Seal (Carbon Seal) | | | 70 | | | 2 | Breather Adapter | | | 60 | | 403 | 1 | Face Seal (Carbon Seal) | | | 70 | | | 2 | Breather Adapter | | | 60 | 2.......….......…...................................…...........…......….......1
D. Access
(1)
Location Zone
318 APU Compartment-Bottom Side of Air Inlet Plenum, On Accessory Gearbox
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
E.
Procedure
S 424-006
CAUTION:_______BE VERY CAREFUL WITH THE CARBON SEAL. A ROUGH MOVEMENT OF THE SEAL CAN CAUSE DAMAGE TO THE SEAL WHICH WILL CAUSE LEAKAGE.
CAUTION:_______DO NOT USE A SOLVENT TO CLEAN THE CARBON SEAL. A SOLVENT CAN CAN DECREASE THE CARBON QUANTITY OF THE SEAL. THIS CAN CAUSE CORROSION OF THE SEAL TO OCCUR MORE QUICKLY.
(1) Install the carbon seal (1) in the breather adapter (2) (Fig. 403):
CAUTION:_______MAKE SURE YOU EXAMINE THE CARBON SEAL. A DAMAGED SEAL CAN CAUSE LEAKAGE.
(a)
Visually examine the carbon seal (1) for cracks or damage. 1) If you find damage, replace the seal (1).
(b)
Put the carbon seal (1) fully into APU oil.
(c)
Move the carbon seal (1) in and out to make sure it move easily in the casing.
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747-400 MAINTENANCE MANUAL
(d) Put the breather adapter (2) fully into APU oil for a minimum of 15 minutes.
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