21-28-10
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A
SEE B
FORWARD CARGO CONDITIONED AIR SUPPLY
(IN RIGHT AIR CONDITIONING EQUIPMENT BAY)
A
Forward Cargo Air Conditioning Flow Regulating Valve Installation
Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D01097
A
747-400
MAINTENANCE MANUAL
FORWARD CARGO AIR CONDITIONING FLOW REGULATING VALVE
CLAMP
(2 LOCATIONS)
ELECTRICAL
CONNECTOR
FORWARD CARGO AIR CONDITIONING
FLOW REGULATING VALVE
B
Forward Cargo Air Conditioning Flow Regulating Valve Installation
Figure 401 (Sheet 2)
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D01116
A
747-400 MAINTENANCE MANUAL
D. Remove the Flow Regulating Valve
S 034-005
(1)
Remove the electrical connector, DV542, from the valve.
S 034-006
(2)
Remove the two clamps from both ends of the valve.
S 034-007
(3)
Remove the two seals from both ends of the valve.
S 024-008
(4)
Remove the valve.
S 434-009
(5)
Put covers on the duct openings.
TASK 21-28-10-404-010
3. Forward Cargo Air Conditioning Flow Regulating Valve Installation_________________________________________________________________
A. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
SSM 21-28-07
(4)
WDM 21-28-41
B. Access
(1)
Location Zone 134 Air Conditioning Equipment Bay, RH
(2)
Access Panel 192MR Air Conditioning Access Panel
C. Install the Valve
S 034-011
(1) Remove the covers from the duct openings.
(a) Make sure there is no unwanted material in the ducts.
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747-400 MAINTENANCE MANUAL
S 434-012
(2)
Install the seals on the duct ends.
S 984-013
(3)
Put the valve in its position between the ducts.
(a) Make sure the flow arrow points aft.
S 434-014
(4)
Install the two clamps on both sides of the valve.
S 434-015
(5)
Tighten the clamps to 45-55 inch-pounds.
S 434-016
(6)
Install the electrical connector, DV542 on the valve.
S 864-017
(7)
Remove the DO-NOT-CLOSE identifiers and close these circuit
breakers:
(a)
Main Power Distribution Panel, P6
1) 6E36, FWD LWR A/C CONT CARGO
(b)
Right Power Distribution Center, P415
1) 415L28, LWR FWD CGO FRV FSO
D. Do the Installation Test for the Flow Regulating Valve
S 864-035
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-036
(2)
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.
S 864-037
(3)
Prepare the CDU for the test:
