(c)  
Set the PACKS 1, 2 and 3 switches to OFF.

 S 862-027
 (21) Operate the applicable heating systems in the airplane until the heated air has no smell of the oil contamination:
 (a)  
Supplemental Heating Systems (AMM 21-42-00/001).

 (b)  
Forward Cargo Compartment Heating System (AMM 21-43-00/001).

 (c)  
Aft Cargo Compartment Heating System (AMM 21-44-00/001).

 S 862-015
 (22)
 Stop the engines (AMM 71-00-00/201).

 S 862-016

 (23)
 Set these switches to OFF at the P5 overhead panel:

 (a)  
ENGINE BLEED 1, 2, 3 and 4 switches

 (b)  
L and R ISLN switches

 (c)  
TRIM AIR switch

 (d)  
AFT CARGO HT switch

 (e)  
FLT DECK FAN switch.

 S 212-017
 (24) Examine these components for oil contamination:
 (a)  
Heat exchangers

 (b)  
Coalescer bags in the water separators

 S 162-018
 (25)
 Clean the components or replace them if they have too much contamination.

 S 862-019

 (26)
 Do the procedure again until the conditioned air in the airplane has no smell of the oil contamination.

 (27)
 Close the access doors to the air conditioning bays.

 S 412-020
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747-400 MAINTENANCE MANUAL
 S 862-021
 (28) Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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747-400
FAULT ISOLATION/MAINT MANUAL

DISTRIBUTION
FIG.
AMM
COMPONENT  102 QTY ACCESS/AREA
REFERENCESHT
CARD - ECS FREIGHTER, YMLA17  3 1 117AL, MAIN EQUIP CTR, FWD ELECT
21-28-06 SYS CARD FILE, M7603 CARD - ENVIRON CONT SYS MISC, YMLA13 3 1 117AL, MAIN EQUIP CTR, FWD ELECT
21-26-02 SYS CARD FILE, M7603 CONNECTOR - GROUND SERVICE 3 3 192HR,191NL
21-21-03 FAN - AFT CARGO VENT FAN, B8290 7 1 AFT CARGO COMPT, RIGHT SIDEWALL
21-26-12 FAN - BULK CARGO VENT FAN, B8291 8 1 BULK CARGO COMPT, LEFT SIDEWALL
21-26-08 FAN - FLIGHT DECK AIR DISTRIBUTION, H544 4 1 AREA BEHIND CREW REST AREA
21-25-03 FAN - FWD CARGO VENT FAN 1, B8642 6 1 FWD CARGO COMPT, ABOVE CEILING
21-26-10 FAN - FWD CARGO VENT FAN 2, B8643 6 1 FWD CARGO COMPT, ABOVE CEILING
21-26-10 MANIFOLD - MAIN DISTRIBUTION 12 1 AREA BENEATH MAIN DECK FLOOR,
21-21-00 STA 1000-1241 MODULE - CABIN TEMP, M7329 1 FLT COMPT, P5
*
MODULE - CAPT HEATER CONTROL, M7375 1 FLT COMPT, P44
*
MODULE - F/O HEATER CONTROL, M7376 1 FLT COMPT, P45
*
SWITCH - LEFT FLAPPER RESET, S20204 1 BULK CARGO SIDEWALL
*
SWITCH - LOWER LOBE CARGO COND AIR FLOW RATE, 1 1 FLT COMPT, P461, CARGO COND AIR
*
S2271 PNL SWITCH - RIGHT FLAPPER RESET, S2021 4 1 BULK CARGO SIDEWALL
*
SWITCH - WSHLD AIR, S3  1 1 FLT COMPT, P44, CAPT HEATER
*
CONTROL MODULE, M7375 SWITCH - WSHLD AIR, S3 1 1 FLT COMPT, P45, F/O HEATER
*
CONTROL MODULE, M7376VALVE - AFT CABIN SHUTOFF, V541 13 1 AREA BENEATH MAIN DECK FLOOR,
21-28-02 STA 1245, LEFT VALVE - AFT CARGO AIR COND FLOW REGULATING, 11 1 WING LDG GEAR WELL, RIGHT
21-28-10 V543 VALVE - AFT CARGO FLAPPER ASSY, LEFT, V488 41 BULK CARGO COMPT, LEFT
21-28-09 VALVE - AFT CARGO FLAPPER ASSY, RIGHT, V489 4 1 BULK CARGO COMPT, RIGHT
21-28-09 VALVE - AFT CGO TRIM AIR SOV, V494 151 BODY LDG GEAR WELL, RIGHT
21-28-04 VALVE - CAPT WINDSHIELD AIR, V464 2 1 FLT COMPT, LEFT
21-22-01 VALVE - COND AIR CHECK 3 3 WING LDG GEAR WELL
21-21-01 VALVE - CREW REST AREA SMOKE MODE SHUTOFF,5 1 AREA BEHIND CREW REST AREA
21-29-02 V553 VALVE - FLIGHT DECK FLOW REGULATING, V54913 1 AREA BENEATH MAIN DECK FLOOR,
21-61-09 STA 1000-1241 VALVE - F/O WINDSHIELD AIR, V465 2 1 FLT COMPT, RIGHT
　
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