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 21-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 715-005
 (6)  
Make sure that the EICAS message VALVE TEST FAIL does not show on the EICAS display.

 S 715-006

 (7)  
Make sure that none of these EICAS status messages show on the EICAS display.

 (a)  
MN DK SOV1

 (b)  
MN DK SOV2

 (c)  
MN DK SOV3

 (d)  
MN DK SOV4

 (e)  
MN DK SOV5

 (f)  
PACK DUMP VLV

 S 865-036
 (8)  
Put the 3 air conditioning pack switches back to the NORM position.

 S 865-037

 (9)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 21-23-00-705-009
 3.  Main Deck Shutoff Valves and Pack Dump Valves - Alternate Operational Test__________________________________________________________________________
 A. General
 (1)  Do this task to do a test of the main deck shutoff valves and the pack dump valves (SMACCS valves) when the ECS freighter card is inoperative.
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Procedure
 S 015-010
 (1)  
Open the air conditioning bay access doors to get access to the pack 1 and pack 3 dump valves.

 (2)
Make sure that the Main Deck Fire Arm switch is not armed.

 S 865-011
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (3)  S 865-012Put the pack 2 and pack 3 air conditioning pack switches on the overhead P5 panel to OFF.
 (4)  S 865-013Put the Pack 1 air conditioning pack switch to NORM.
 (5)  S 035-014Remove electrical connector DV93 from the pack 1 flow control valve.
 (6)  S 035-015Remove the cap from connector D40823J at the L-MAIN EQPT / E1-1 THROUGH E1-6 disconnect panel number AE0411 at STA 450, approximately 5 feet above the floor and 50 inches to the left of the airplane centerline in the E/E bay.
 (7)  S 865-016Make sure that there is continuity between pins 1, 3, 5, 7, and 9 of connector D40823J and ground.
 NOTE:____ This step checks the open limit switch contacts for the five main deck shutoff valves as follows:
 Pin 1, Main Deck Shutoff Valve 1, V544 Pin 3, Main Deck Shutoff Valve 2, V545 Pin 5, Main Deck Shutoff Valve 3, V546 Pin 7, Main Deck Shutoff Valve 4, V547 Pin 9, Main Deck Shutoff Valve 5, V548
 (8)  S 865-017Make sure that there is no continuity between pins 2, 4, 6, 8, and 10 of connector D40823J and ground.
 NOTE:____ This step checks the closed limit switch contacts for the five main deck shutoff valves as follows:
 Pin 2, Main Deck Shutoff Valve 1, V544 Pin 4, Main Deck Shutoff Valve 2, V545 Pin 6, Main Deck Shutoff Valve 3, V546 Pin 8, Main Deck Shutoff Valve 4, V547 Pin 10, Main Deck Shutoff Valve 5, V548

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-00
 ALL  ú ú 02F Page 503 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-018
 (9)  
Look at the valve position indicator on the pack 1 (V556) and pack 3 (V557) dump valves in the air conditioning bay and make sure that they are both OPEN.

 S 865-039

 (10)
　
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