Zone Trim Air Modulating Valve Installation
Figure 401 (Sheet 2)

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C79187
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747-400
MAINTENANCE MANUAL

ZONE TRIM AIR MODULATION VALVE
(EXAMPLE)

Zone Trim Air Modulating Valve Installation
Figure 401 (Sheet 3)

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MAINTENANCE MANUAL

 S 864-003
 (2)  Set the EICAS ECS maintenance page on the CMC CDU (AMM 45-10-00/201).
 S 864-004
 (3)  Push the ECS switch on the EICAS Display Select Panel to show the ECS synoptic page.
 S 864-005
 (4)  Remove the pressure in the pneumatic system (AMM 36-00-00/201).
 S 864-006
 (5)  Do these steps to remove the air in the trim air ducts if you will remove any valve except the lower cargo valves: (a) Turn and hold the FLT DECK TEMP selector to the MAN W position while you monitor the EICAS ECS maintenance page. (b) Make sure the TRIM VAL POS F/D indication, on the EICAS ECS maintenance page, is between 0.90 and 1.00.
 NOTE:____ The trim air PRSOV will open and permit the air in the trim air ducts to be released.
 (c) (d) (e)  Turn the FLT DECK TEMP selector to the AUTO position.Make sure the TRIM AIR PRESS indication, on the EICAS ECS maintenance page, is approximately 0.Make sure the two DUCT PSI indications (left and right), on the EICAS ECS synoptic page, are approximately 0.
 S 864-042
 (6)  Do these steps to remove the pressure in the trim air ducts if you will remove the lower cargo valves: (a) Turn and hold the applicable LOWER LOBE TEMP selector on the P5 panel to MAN W. (b) Make sure the applicable TRIM VAL POS indication, on the EICAS ECS maintenance page, is between 0.90 and 1.00.
 NOTE:____ The trim air PRSOV will open and permit the air in the trim air ducts to be released.
 (c) (d) (e)  Turn the applicable LOWER LOBE TEMP selector to AUTO.Make sure the applicable TRIM AIR PRESS indication, on the EICAS ECS maintenance page, is approximately 0.Make sure the two DUCT PSI indications (left and right), on the EICAS ECS synoptic page, are approximately 0.

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 S 864-007
 (7)  Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a)  P6 Main Power Distribution Panel
 1) 6F28 ZONE TEMP CONT AC
 2) 6F29 ZONE TEMP CONT DC

 S 864-027
 (8)  Open the applicable circuit breakers for the valve you will remove and attach DO-NOT-CLOSE identifiers:
 (a)  
FLIGHT DECK VALVE
 1) P6 Main Power Distribution Panel
 a) 6G36, AUTO/MAN TEMP CONT

 2)  P414 Main Power Distribution Panel, Left a) 414A12, FLT DK MANUAL TEMP CONT

 (b)  
UPPER DECK VALVE
 1) None

 (c)  
CREW REST AREA VALVE

 1)  P6 Main Power Distribution Panel
 a) 6G34, UPR DK CREW MOD VLV

 (d)  
FORWARD MAIN DECK VALVE
 1) P6 Main Power Distribution Panel
 a) 6G36, AUTO/MAN TEMP CONT ZN MN DK FWD

 2)  P415 Main Power Distribution Panel, Right a) 415B26, MAN TEMP CONT FWD MN DK

 (e)  
AFT MAIN DECK VALVE
 1) P6 Main Power Distribution Panel
 a) 6G36, AUTO/MAN TEMP CONT

 2)  P414 Main Power Distribution Panel, Left a) 414B14, AFT MN DK MAN TEMP CONT
　
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