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 36-00-00
 ALL  ú ú 04 Page 3 ú Feb 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PNEUMATIC SYSTEM - MAINTENANCE PRACTICES
________________________________________
 1.  General_______
 A.  This procedure contains five tasks. The first task pressurizes the pneumatic system with a ground air source. The second task pressurizes the pneumatic system with the auxiliary power unit (APU). The third task pressurizes the pneumatic system with one or more of the engines. The fourth task pressurizes the pneumatic system upstream of the PRSOV. The fifth task releases the pressure in the pneumatic system.
 WARNING:_______BE CAREFUL WHEN YOU PRESSURIZE THE PNEUMATIC SYSTEM. WHEN YOU PRESSURIZE THE PNEUMATIC SYSTEM, THESE PNEUMATIC OPERATED SYSTEMS AND COMPONENTS CAN OPERATE:
 -AIR CONDITIONING SYSTEM
 -LEADING EDGE FLAPS
 -AIR DRIVEN HYDRAULIC DEMAND PUMPS
 -ENGINE START SYSTEM
 ACCIDENTAL OPERATION OF ONE OR MORE OF THESE SYSTEMS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 WHEN YOU PRESSURIZE THE PNEUMATIC SYSTEM, YOU SUPPLY PRESSURE TO THESE SYSTEMS:
 -NACELLE ANTI-ICE
 -WING ANTI-ICE SYSTEM
 -POTABLE WATER PRESSURIZATION SYSTEM
 -LOWER CARGO COMPARTMENT HEATING SYSTEM
 IF YOU DO NOT ISOLATE THESE SYSTEMS, YOU CAN HAVE AN ACCIDENTAL LOSS OF PNEUMATIC PRESSURE.
 B.  It is necessary to pressurize the pneumatic system to operate a pneumatic operated system or component.
 TASK 36-00-00-862-001
 2.  Pressurize the Pneumatic System with a Ground Air Source________________________________________________________
 A.  Equipment
 (1)
Air source that can connect to the pneumatic ground connections.

 B.  
References

 (1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)
AMM 24-22-00/201, Manual Control

 C.  
Access

 (1)  
Location Zone 193 Fairing, Wing To Body, Aft Lower Half, LH

 (2)  
Access Panel
 193AL Door - Ground Air-Conditioning

 

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
 D. Procedure
 S 862-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-003

 (2)  
Make sure that these circuit breakers are closed:

 (a)  
Main Power Distribution Panel, P6
 1) 6H20 L ISO VLV AIR SUPPLY PWR
 2) 6H24 R ISO VLV AIR SUPPLY PWR
 3) 6H32 AIR SUPPLY CONT ENG 1
 4) 6H33 AIR SUPPLY CONT ENG 2
 5) 6H34 AIR SUPPLY CONT ENG 3
 6) 6H35 AIR SUPPLY CONT ENG 4

 

 S 862-004
 (3)  
Put the two wing ISLN switches, on the P5 overhead panel, to the OPEN position.

 S 862-048

 (4)  
Make sure that the PACKS 1, 2, and 3 switches, on the P5 overhead panel, are in the OFF position.

 S 862-005

 (5)  
Push the ECS switch on the EICAS display select panel.

 S 012-006

 (6)  
Open the access door, 193 AL (AMM 06-09-03/201).

 S 782-127
 WARNING: DO NOT SUPPLY MORE THAN 45 PSIG OF PRESSURE TO THE PNEUMATIC
_______ SYSTEM. IF YOU SUPPLY TOO MUCH PRESSURE, DAMAGE TO EQUIPMENT AND INJURIES TO PERSONNEL CAN OCCUR.
 (7)
Start the ground air source and do not supply more than 45 psig.

 (a)  
The MANIFOLD DUCT PRESSURE is shown on the Primary EICAS display.

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747-400 MAINTENANCE MANUAL
 TASK 36-00-00-862-008
 3.  Pressurize the Pneumatic System with the APU____________________________________________
　
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