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747-400 MAINTENANCE MANUAL
(b) Put the ENGINE BLEED 3 and 4 switches to ON.
NOTE:____ The engine bleed air pressure regulating and shutoff
valves open.
(c) Put the R ISLN switch to ON.
NOTE:____ The right wing isolation valve opens and the engine
bleed air goes out through the check valve opening.
(d) Let the engines operate until the engine bleed air has no smell
of the oil contamination.
(e) Stop the engines (AMM 71-00-00/201).
(f) Put the R ISLN switch to OFF.
NOTE:____ The right wing isolation valve closes.
(g) Put the ENGINE BLEED 3 and 4 switches to OFF.
NOTE:____ The engine bleed air pressure regulating and shutoff
valves close.
S 422-008
(13)
Install the check valve which you removed from the pneumatic ground connector (AMM 36-11-14/401).
S 862-009
(14)
Start the APU again (AMM 49-11-00/201).
S 862-028
(15)
Set the APU BLEED switch to ON.
S 862-010
(16)
Operate the three air conditioning packs:
NOTE: This procedure uses the APU bleed air to remove the oil
____ contamination from the conditioned air in the airplane.
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747-400
MAINTENANCE MANUAL
WARNING: MAKE SURE THERE IS AN EXIT FOR THE CONDITIONED AIR IN THE
_______ AIRPLANE. ACCIDENTAL CABIN PRESSURIZATION CAN CAUSE INJURY TO PERSONS.
(a)
Make sure the pressurization outflow valves are open
(AMM 21-31-00/001) or at least one entry door is open
(AMM 52-11-00/001).
(b)
Set the position of these switches on the P5 overhead panel as follows: 1) L and R ISLN switches to ON 2) PACKS 1, 2 and 3 switches to NORM 3) TRIM AIR switch to ON 4) AFT CARGO HT switch to ON 5) All of the zone temperature control switches on the
temperature control panel to AUTO.
6) HI FLOW switch to ON
7) FLIGHT DECK FAN switch to ON.
(c)
Let the air conditioning packs operate until the conditioned air in the airplane has no smell of the oil contamination.
(d)
Set the PACKS 1, 2 and 3 switches to OFF.
S 862-011
(17)
Stop the APU (AMM 49-11-00/201).
S 862-012
(18)
Set the APU BLEED switch to OFF.
S 862-013
(19)
Start the engines and let the engines operate at ground idle speed (AMM 71-00-00/201).
S 862-014
(20)
Operate the three air conditioning packs:
NOTE: This procedure uses the engine bleed air to remove the oil
____ contamination from the conditioned air in the airplane.
(a) Set the position of theses switches on the P5 overhead panel as follows: 1) PACKS 1, 2 and 3 switches to NORM
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747-400 MAINTENANCE MANUAL
2) ENGINE BLEED 1, 2, 3 and 4 switches to ON
(b)
Let the air conditioning packs operate until the conditioned air in the airplane has no smell of the oil contamination.
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