(b)  
DV557, Pack 3 SMACCS Valve

 S 034-012
 (2)  
Remove the nut and washer that attaches the bonding jumper to the valve.

 S 034-013

 (3)  
Remove the bonding jumper from the valve.

 S 034-014

 (4)  
Remove the clamps from both ends of the valve.

 NOTE: You can use a plastic mallet to loosen the clamp.
____
 S 024-015
 (5)  
Remove the valve.

 S 434-016

 (6)  
Put a cover on the duct openings.

 TASK 21-51-02-404-017
 3.  Pack Dump Valve (SMACCS) Installation (Fig. 401)_____________________________________
 A. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 36-00-00/201 Pneumatic System

 (4)  
SSM 21-51-01

 (5)  
WDM 21-51-11

 B. Access
 (1)  Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH
 (2)  Access Panel
 191H-L Air Conditioning Access Door
 192H-R Air Conditioning Access Door

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A
747-400 MAINTENANCE MANUAL
 C. Install the Valve
 S 034-018
 (1)  
Remove the covers from the duct openings.

 S 214-019

 (2)  
Make sure the duct and valve flanges are clean and there is no grease on them.

 S 214-020

 (3)  
Make sure the seals in the duct flanges are not damaged.

 S 984-021

 (4)  
Put the valve in its position in the duct.

 NOTE: Make sure the flow arrow on the valve points away from the
____
 flow control valve.

 S 434-022
 (5)  Install the clamps on both ends of the valve.
 (a)  Do not tighten the clamps.
 S 984-023
 (6)  
Turn the valve until you can connect the electrical connector and the bonding jumper.

 S 434-024

 (7)  
Tighten the clamp nuts to 65-75 inch-pounds.

 S 434-025

 (8)  
Install the bonding jumper to the valve with the washer and the nut.

 (a)  Make sure the bonding resistance between the valve and the airplane structure is not greater than 0.0025 OHMS.
 S 434-026
 (9)  Install the electrical connector on the valve:
 (a)  
DV556, Pack 1 SMACCS Valve.

 (b)  
DV557, Pack 3 SMACCS Valve.

 S 864-027
 (10) Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  Left Power Distribution Center, P414
 1) 414L13, PACK 1 OVBD DUMP CONT VALVE

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747-400 MAINTENANCE MANUAL
 (b)  Right Power Distribution Valve, P415
 1) 415L26, PACK 3 OVBD DUMP VLV CONT

 D. Do the Installation Test of the Pack Dump Valve (SMACCS)
 S 864-001
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-002

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

 S 864-003

 (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.
　
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