(g)
Drain the oil from the fuel-cooled oil cooler (5) into the oil container.
(h)
Remove the two transfer tubes (1), (10) and four packings (2), (11). 1) Discard the four packings (2), (11).
(i)
Make sure you install all necessary protection covers.
(j)
Remove the fuel and oil containers.
TASK 49-91-02-404-011
3. Fuel-Cooled Oil Cooler Installation (Fig. 401)
___________________________________
A. References
(1)
AMM 12-13-02/301, Auxiliary Power Unit
(2)
AMM 49-11-00/201, Auxiliary Power Unit
B.
Consumable Materials
(1)
D00098 Fuel - Turbine Engine (or equivalent)
(2)
D00418 Oil - Aircraft Turbine Engine
C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | Packing | 49-91-02 | 01 | 25 | | | 5 | Fuel-Cooled Oil Cooler | | | 40 | | | 6 | Packing | 49-31-00 | 01 | 160 | | | 11 | Packing | 49-91-02 | 01 | 25 | 2.......….......…...................................…...........…......….......1
D. Access
(1)
Location Zones 221 Control Cabin - Left 222 Control Cabin - Right 310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
E.
Procedure
S 424-029
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
(1)
Do these steps to install the fuel-cooled oil cooler (5):
(a)
Lubricate the four new packings (2), (11) with a light coat of oil.
(b)
Install the four packings (2), (11) on the two transfer tubes (1), (10).
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ALL ú ú 04 Page 404 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
(c)
Install the two transfer tubes (1), (10) in the inlet and outlet ports of the oil sensor housing.
(d)
While you install the fuel-cooled oil cooler (5) on the oil sensor housing, make sure the two transfer tubes (1), (10) are installed in the correct positions on the oil sensor housing.
(e)
Install the fuel-cooled oil cooler (5) on the oil sensor housing with the three washers (3) and three nuts (4). 1) Tighten the three nuts (4) to 32-36 inch-pounds (3.6-4.1
newton-meters).
(f)
Lubricate the two new packings (6) with a light coat of fuel.
(g)
Install the two packings (6) on the two tube nipples (7).
(h)
Install the two tube nipples (7) in the inlet and outlet ports of the fuel-cooled oil cooler (5). 1) Tighten the two tube nipples (7) to 110-120 inch-pounds
(12.4-13.6 newton-meters).
(i)
Connect the fuel supply tube (9) to the inlet port and fuel return tube (8) to the outlet port of the fuel-cooled oil cooler (5). 1) Tighten the two coupling nuts on the fuel supply tube (9)
and fuel return tube (8) to 270-300 inch-pounds (30.5-33.9 newton-meters).
F. Fuel-Cooled Oil Cooler Installation Test
S 864-021
(1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6-2 Main Power Distribution Panel
1) 6K18, APU ALTN CONT
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
S 864-022
(2)
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
S 794-026
(3)
Do the installation test for the fuel-cooled oil cooler:
(a)
Do this task: APU Starting and Operation (AMM 49-11-00/201).
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