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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-079
 (11) Push in the applicable engine START switch.
 S 865-099
 (12) Let the pneumatic system pressure decrease to 0 psig.
 S 865-090
 (13) Open the 6J18 ENG START AIR CONT circuit breaker.
 S 435-087
 (14) Connect the electrical connector, DV351 to the engine start valve.
 S 795-081
 (15) Do this test again on the remaining engines, as applicable.
 S 865-088
 (16) For the applicable engine, Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6F01, ENG 1 IGN 1
 2) 6F02, ENG 2 IGN 1
 3) 6F03, ENG 3 IGN 1
 4) 6F04, ENG 4 IGN 1
 5) 6G19, STBY IGN ENG 1
 6) 6G20, STBY IGN ENG 2
 7) 6G21, STBY IGN ENG 3
 8) 6G22, STBY IGN ENG 4
 9) 6J18, ENG START AIR CONT
 10) 6K19, ENG 1 IGN 2
 11) 6K20, ENG 2 IGN 2
 12) 6K21, ENG 3 IGN 2
 13) 6K22, ENG 4 IGN 2
 14) 6L10, ENG 1 FUEL CONT VLV
 15) 6L11, ENG 2 FUEL CONT VLV
 16) 6L12, ENG 3 FUEL CONT VLV
 17) 6L13, ENG 4 FUEL CONT VLV

 S 085-089
 (17) Remove the TE65B98600 block-off plate from the APU duct.
 S 435-090
 (18) Install the seal between the duct flanges.
 S 435-091
 (19) Install the coupling on the duct flanges.
 S 435-065
 (20) Tighten the coupling to 65-85 pound-inches (7-9 N.m).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 085-092
 (21)
 Remove the 2TE65B07917 duct section.

 S 435-093

 (22)
 Install the APU check valve (AMM 36-11-08/401).

 S 445-089

 (23)
 Unlock the pack flow control valves, if the valves are locked in the CLOSED position.

 S 085-094

 (24)
 If necessary, remove the 2TE65B40004 block-off plates from the pack valve inlets.

 S 435-095

 (25)
 If necessary, install the pack valves (AMM 21-51-01/401).

 S 025-101

 (26)
 Remove the BACC14AD08 seal cap assembly at the boss for the TAT aspirator tube on the crossover manifold duct.

 S 435-102

 (27)
 Connect the TAT aspirator tube to the boss on the crossover manifold duct.

 S 415-103

 (28)
 Close access panel 191BL (AMM 06-09-03/201).

 S 085-096

 (29)
 Remove the BACC14AD06 seal cap assembly from each hydraulic reservoir pressurization tube.

 S 435-097

 (30)
 Install a drain cap on the four hydraulic reservoir pressurization tubes.

 S 085-098

 (31)
 Remove the BACC14AD06 seal cap assembly from the potable water pressurization boss on the crossover manifold duct.

 S 435-099

 (32)
 Connect the potable water pressurization hose to the boss on the crossover manifold duct.

 (33)
 Pressurize the pneumatic system with the APU (AMM 36-00-00/201).

 S 865-100
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 795-101
 (34)
 Make sure that there is not a high concentration of leakage at these locations:

 (a)  
The threads of the four drain caps for the hydraulic reservoir pressurization tube.

 (b)  
The first coupling forward of the APU firewall

 (c)  
The two couplings on the APU check valve

 (d)  
The pack valve inlets

 (e)  
The potable water pressurization hose connection.
　
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