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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 S 866-046
 (23) For the applicable engine, Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6H32 AIR SUPPLY CONT ENG 1
 2) 6H33 AIR SUPPLY CONT ENG 2
 3) 6H34 AIR SUPPLY CONT ENG 3
 4) 6H35 AIR SUPPLY CONT ENG 4
 5) 6G19 STBY IGN ENG 1
 6) 6G20 STBY IGN ENG 2
 7) 6G21 STBY IGN ENG 3
 8) 6G22 STBY IGN ENG 4

 S 866-027
 (24) For the applicable engine, Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6L10 ENG 1 FUEL CONT VLV
 2) 6F01 IGN 1 ENG 1
 3) 6K19 IGN 2 ENG 1
 4) 6L11 ENG 2 FUEL CONT VLV
 5) 6F02 IGN 1 ENG 2
 6) 6K20 IGN 2 ENG 2
 7) 6L12 ENG 3 FUEL CONT VLV
 8) 6F03 IGN 1 ENG 3
 9) 6K21 IGN 2 ENG 3
 10) 6L13 ENG 4 FUEL CONT VLV
 11) 6F04 IGN 1 ENG 4
 12) 6K22 IGN 2 ENG 4

 S 036-028
 (25) Disconnect the PRV supply pressure tube from the pneumatic manifold downstream of the intermediate pressure check valve.
 S 036-040
 (26) Put a cap on the open tube to keep out unwanted objects.
 S 046-029
 (27) Deactivate the HPSOV (AMM 36-11-05/201).
 NOTE: This will make sure that only intermediate stage bleed air
____ is permitted to supply pressure to the pneumatic manifold.
 S 726-030
 (28) Dry motor the engine (AMM 71-00-00/201) with the thrust reverser half open.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 286-031
 (29) Do a check for air flow at the PRV supply pressure port in the pneumatic manifold.
 (a)  If there is no air flow from the port, replace the check valve
 (AMM 36-11-02/401).
 NOTE:____ A valve failure occurred in the closed position.
 (b)  If there is air flow from the port, the valve is in the correct
 (open) position.

 S 726-032
 (30)
 Stop the engine (AMM 71-00-00/201).

 S 446-033

 (31)
 Activate the HPSOV (AMM 36-11-05/201).

 S 436-034

 (32)
 Remove the cap from the PRV supply pressure tube.

 S 436-041

 (33)
 Connect the PRV supply pressure tube to the pneumatic manifold.

 S 796-035

 (34)
 Dry motor the engine (AMM 71-00-00/201).

 S 796-042

 (35)
 Examine the PRV supply pressure tube connection for leakage.

 S 796-043

 (36)
 Stop the engine (AMM 71-00-00/201).

 S 866-036

 (37)
 Remove the DO-NOT-OPERATE tag from the applicable FUEL CONTROL switch.

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A
747-400 MAINTENANCE MANUAL
 S 416-047
 WARNING:_______ OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
 REVERSERS.  IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE
 THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT CAN OCCUR.

 (38)
 Close the left thrust reverser half (AMM 78-31-00/201).

 S 446-048

 (39)
 Do the activation procedure for the thrust reverser (AMM 78-31-00/201).

 S 866-038

 (40)
 Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).
　
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