(2)
IPC 21-43-52 Fig. 2
(3)
IPC 21-58-03 Fig. 1
B. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, LH 122 Forward Cargo Compartment Forward Half, RH
C. Do the Inspection
S 026-002
(1)
Remove the check valve (AMM 21-58-03/401).
S 216-003
(2)
Look at the check valve to make sure it has these conditions:
(a)
All of the parts are there
(b)
The housing does not have a crack or corrosion
(c)
The mating (sealing) surfaces of the flappers and the valve body are not worn or damaged.
(d)
The flappers move easily.
S 966-005
(3)
If the check valve does not have one of these conditions, replace the check valve.
(4)
Install the check valve (AMM 21-58-03/401).
S 426-004
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-58-03
ALL ú ú 01 Page 601 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
NINE-INCH DUCT VALVE - REMOVAL/INSTALLATION
___________________________________________
1. General_______
A. The nine-inch duct valves are the valves in the equipment cooling system that are nine inches in diameter. They are:
(1)
The inboard supply valve
(2)
The inboard exhaust valve
(3)
The bypass valve.
B. This procedure has the tasks that follow:
(1)
Nine-Inch Duct Valve Removal
(2)
Nine-Inch Duct Valve Installation
(3)
Inboard Exhaust Valve Actuator Removal
(4)
Inboard Exhaust Valve Actuator Installation
C. The inboard supply valve and the bypass valve are installed in the left sidewall of the forward cargo compartment at Station 580. The inboard exhaust valve is installed below the floor of the forward cargo compartment at station 560.
TASK 21-58-04-004-001
2. Nine-Inch Duct Valve Removal (Fig. 401)____________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
(3)
IPC 21-58-04 Fig. 2
(4)
IPC 21-58-04 Fig. 3
(5)
WDM 21-58-12, 21-58-13
(6)
SSM 21-58-03
B. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, LH
C. 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 COULD CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
(1) Remove the electrical power (Ref 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-58-04
ALL ú ú 03 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
GROUND
EXHAUST
DUCT
SEE B
EQUIPMENT
SEE A COOLING INBOARD EXHAUST
EXHAUST VALVE
SEE C
FWD
BYPASS
DUCT
A
SUPPLY VALVE
SEE E
SUPPLY FAN SMOKE/OVERRIDE (REF) VALVE (REF)
BYPASS VALVE
STA STA STA
FWD
580 SEE D 560 540
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