(d)
DV547, Shutoff valve 4

 (e)
DV548, shutoff valve 5

 S 034-004
 (4)
Remove the two couplings from both sides of the valve.

 S 024-005

 (5)
Remove the valve.

 S 434-006

 (6)
Put covers over the duct openings.

 TASK 21-23-03-404-016
 3.  Main Deck Fire Shutoff Valve Installation (Fig. 401)_________________________________________
 A. References
 (1)
AMM 24-22-00/201 Manual Control

 (2)
SSM 21-28-06

 (3)
WDM 21-28-61

 B. Access
 (1)  Location Zone
 241 Main Deck, LH
 242 Main Deck, RH

 C. Install the Valve
 S 034-007
 (1) Remove the covers from the duct openings.
 (a) Make sure there is no unwanted material in the ducts.
 S 984-008
 (2)
Put the valve in its position in the duct.

 (a) Make sure the valve actuator is oriented facing aft.

 (3)
Install the two couplings on both sides of the valve.

 S 434-010

 (4)
Install the electrical connector on the valve:

 (a)
DV544, Shutoff valve 1

 (b)
DV545, Shutoff valve 2

 (c)
DV546, Shutoff valve 3

 (d)
DV547, Shutoff valve 4

 (e)
DV548, shutoff valve 5

 S 434-009
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 864-011
 (5)  Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  
Overhead Panel, P7
 1) 7F6, MN/DK FIRE A/C SOV CONT

 (b)  
Left Power Distribution Center, P414
 1) 414B1, MN DK FIRE AIR COND SOV-1
 2) 414B2, MN DK FIRE AIR COND SOV-2
 3) 414B3, MN DK FIRE AIR COND SOV-3
 4) 414B10, MN DK FIRE AIR COND SOV-4
 5) 414B11, MN DK FIRE AIR COND SOV-5

 D. Do the Installation Test of the Valve
 S 864-017
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-018

 (2)  
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.

 S 864-019

 (3)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.

 (d)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (e)  
Push the NEXT PAGE key until you find <21 AIR CONDITIONING.

 (f)  
Push the LSK that is adjacent to <21 AIR CONDITIONING to show the GROUND TESTS menu for the air conditioning system.

 (g)  
Push the NEXT PAGE key until you find <SHUTOFF/DUMP VLV

 NOTE: If INHIBITED shows above <SHUTOFF/DUMP VLV the test
____
 will not operate.

 (h)  If INHIBITED shows above <SHUTOFF/DUMP VLV: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
 test menu again.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-020
 (4)  Push the LSK that is adjacent to SHUTOFF/DUMP VLV.
 NOTE: IN PROGRESS shows during the test.
____
 S 714-021
 (5)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <SHUTOFF/DUMP VLV
 NOTE: If a PASS indication shows, no failures occurred during the
　
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