21-51-14
ALL ú ú 01 Page 401 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
PACK 2 RAM AIR DUCT
A AIR DUCT PACK 1 RAM SEE RAM AIR DUCT PACK 3 FWD
EQUIPMENT BAY AIR CONDITIONING
BSEE CHECK VALVE BSEE GASKET (16 PLACES) BOLT, NUT AND WASHER
SUPPORT ROD BRACKET
CLAMP ASSEMBLY
FLEXIBLE DUCT
DUCT RAM AIR (2 PLACES) SUPPORT ROD
AIR CYCLE MACHINE (REF) FWD
PACK 1 (TYPICAL)
A
Cooling Air Check Valve Installation Figure 401 (Sheet 1)
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21-51-14
ALL ú ú 01 Page 402 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
GASKET
B
Cooling Air Check Valve Installation
Figure 401 (Sheet 2)
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21-51-14
ALL ú ú 01 Page 403 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 034-005
(2)
Move the flexible duct away from the check valve.
S 034-006
(3)
Remove the bolts (16 locations) that hold the check valve to the heat exchanger header duct.
(a)
Move the support rods and brackets away from the check valve.
(b)
Do not remove the brackets from the support rods.
S 024-007
(4)
Remove the check valve.
S 034-008
(5)
Put a cover on the duct openings.
TASK 21-51-14-404-009
3. Cooling Air Check Valve Installation (Fig. 401)____________________________________
A. References
(1)
06-09-03/201, Body Section 44 Access Doors and Panels
(2)
21-00-00/201, Air Conditioning
(3)
IPC 21-62-56 Fig. 1 and 2
B. Access
(1)
Location Zone
133 Air Conditioning Equipment Bay, LH
134 Air Conditioning Equipment Bay, RH
(2)
Access Panel
191F-L Air Conditioning Access Panel
191N-L Air Conditioning Access Door
192F-R Air Conditioning Access Panel
C. Install the Check Valve
S 434-010
(1) Remove the covers from the duct openings.
(a) Make sure there is no unwanted material in the ducts.
S 214-011
(2)
Make sure the gasket and the flexible duct do not have a crack or other damage.
S 284-012
(3)
Make sure all of the flappers (8 of them) in the check valve move easily.
S 424-013
(4)
Put the check valve and the gasket in their positions in the ram-air duct.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 434-022
(5)
Install two bolts, washers, and nuts to hold the check valve and the gasket in their positions.
S 434-014
(6)
Put the support rods and the brackets in their positions against the check valve.
S 434-023
(7)
Install the bolts, washers, and nuts to hold the brackets to the check valve.
S 434-015
(8)
Install the other bolts, washers, and nuts (16 locations) to hold the check valve to the heat exchanger header duct.
S 434-016
(9)
Move the flexible duct on the check valve until the duct joint is in the middle of the flexible duct.
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