21-58-11
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A
747-400 MAINTENANCE MANUAL
 GROUND EXHAUST VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the ground exhaust valve. This procedure also has instructions to remove and install the ground exhaust valve actuator. You may remove the actuator without removing the ground exhaust valve from the airplane. The valve is installed below the floor at station 550 of the forward cargo compartment.
 TASK 21-58-12-004-001
 2.  Ground Exhaust Valve Removal (Fig. 401)____________________________
 A.  Standard Tools and Equipment
 (1) Knife, Plastic (Nonmetallic)
 B.  References
 (1)
24-22-00/201, Manual Control

 (2)
IPC 21-58-12 Fig. 1

 (3)
WDM 21-58-16

 (4)
SSM 21-58-06

 C.  Access
 (1)  Location Zone 122 Forward Cargo Compartment Forward Half, RH
 D.  Prepare for the Removal
 S 864-002
 CAUTION: DO NOT OPERATE THE ELECTRICAL/ELECTRONIC EQUIPMENT WHEN YOU DO
_______ THIS PROCEDURE. IF YOU OPERATE THE ELECTRICAL EQUIPMENT WHEN THE EQUIPMENT COOLING SYSTEM IS OFF, YOU CAN CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
 (1)
Remove the electrical power (AMM 24-22-00/201).

 (2)
Remove the moisture shroud from the valve.

 (3)
Disconnect the electrical connector, DV447 (10), from the valve (9).

 (4)
Disconnect the bonding jumper (11) from the valve (9).

 S 034-029
 S 034-003
 S 034-004
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 21-58-12
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747-400
MAINTENANCE MANUAL

9.  ELECTRICAL VALVE CONNECTOR SEE A GROUND EXHAUST VALVE 10.  HOUSING DRIVE  ADAPTER ACTUATOR  4.  DUCT  DUCT 
AIRCRAFT SKIN  FLOW 
GASKET8. 
5.  COUPLING 
O-RING 
CONNECTION ELECTRICAL ADAPTER ACTUATOR  A  B  11.  BONDING JUMPER  FWD 
COLLAR DRIVE MANUAL  OVERRIDE MANUAL  B  7.  A BOLT SCREW (4 LOCATIONS) WASHER (3 LOCATIONS) BOLT (14 LOCATIONS) BONDING LUG ACTUATOR ROTARY (EXAMPLE, BOLT HOUSING 15 LOCATIONS) 6. 2. 1. 
GROUND EXHAUST VALVE 
A  GASKET FLANGE VALVE  GROUND EXHAUST VALVE 

AIRPLANE FWD SEALING
SKIN COMPOUND

A-A
Equipment Cooling Ground Exhaust Valve - Installation
Figure 401 (Sheet 1)

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F54481
A
747-400
MAINTENANCE MANUAL

C-C
Equipment Cooling Ground Exhaust Valve - Installation
Figure 401 (Sheet 2)

B33837
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747-400 MAINTENANCE MANUAL
 S 144-005
 (5)  
Use the knife to cut the aerodynamic seal on the outer surface of the valve.

 S 034-006

 (6)  
Remove the bolts (6 and 7) from the outer side of the airplane.

 (a)  Make a record of where the short bolt (6) is installed.
 S 034-007
 (7)  
Remove the coupling (5) from the top of the valve (9).

 S 024-026

 (8)  
Remove the valve (9).

 S 034-027

 (9)  
　
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