747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 1(11)

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 (4)  S 422-004Install the water separators (AMM 21-51-05/201).
 (5)  S 162-005Clean the pneumatic ducts and the components where you can see the oil contamination.
 (6)  S 962-030Replace the components if they have too much contamination.
 (7)  S 862-023Supply electrical power (AMM 24-22-00/201).
 (8)  S 862-024Make sure these switches are set to OFF at the P5 overhead panel: (a) PACKS 1, 2 and 3 switches (the air conditioning packs are off) (b) L and R ISLN switches (the wing isolation valves are closed) (c) APU BLEED switch (the APU bleed air shutoff valve is closed) (d) ENGINE BLEED 1, 2, 3, and 4 switches (the engine bleed air pressure regulating and shutoff valves are closed) (e) TRIM AIR switch (the trim air pressure regulating and shutoff valve is closed) (f) HI FLOW switch (g) AFT CARGO HT switch (h) FLIGHT DECK FAN switch.
 (9)  S 022-006Remove one of the two check valves at the pneumatic ground connectors (AMM 36-11-14/401).
 NOTE:____ This will permit the initial bleed air, which has more oil contamination, to go out through the check valve opening.

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747-400 MAINTENANCE MANUAL
 S 862-007
 WARNING:_______ DO NOT GO NEAR THE CHECK VALVES WHEN YOU PRESSURIZE THE APU
 PNEUMATIC DUCT.  THE APU BLEED AIR CAN CAUSE INJURY TO PERSONS
 WHEN THE BLEED AIR GOES OUT THROUGH THE CHECK VALVE OPENING.

 (10) Pressurize the APU pneumatic duct:
 NOTE: This procedure will remove the oil contamination from the APU
____ bleed air. The APU bleed air will go out through the check valve opening.
 (a)  
Start the APU and let the operation of the APU become stable (AMM 49-11-00/201).

 (b)  
Put the APU BLEED switch to ON.

 NOTE: The APU bleed air shutoff valve opens and the bleed air
____ goes out through the check valve opening.
 (c)  
Let the APU operate until the APU bleed air has no smell of the oil contamination.

 (d)  
Stop the APU (AMM 49-11-00/201).

 (e)  
Put the APU BLEED switch to OFF.

 NOTE: The APU bleed air shutoff valve closes.
____
 S 862-025
 WARNING: DO NOT GO NEAR THE CHECK VALVES WHEN YOU PRESSURIZE THE ENGINE
_______ PNEUMATIC DUCTS. THE ENGINE BLEED AIR CAN CAUSE INJURY TO PERSONS WHEN THE BLEED AIR GOES OUT THROUGH THE CHECK VALVE OPENING.
 (11) Pressurize the pneumatic ducts for the left engines (No. 1 and 2):
 NOTE: This procedure will remove the oil contamination from the
____ bleed air for the left engines. The engine bleed air will go out through the check valve opening.
 (a)  Start the left engines and let the engines operate at ground idle speed (AMM 71-00-00/201).
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747-400 MAINTENANCE MANUAL
 (b)  Put the ENGINE BLEED 1 and 2 switches to ON.
 NOTE:____ The engine bleed air pressure regulating and shutoff
 valves open.
 (c)  Put the L ISLN switch to ON.
 NOTE:____ The left 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 L ISLN switch to OFF.
 NOTE:____ The left wing isolation valve closes.
 (g)  Put the ENGINE BLEED 1 and 2 switches to OFF.
 NOTE:____ The engine bleed air pressure regulating and shutoff
 valves close.

 S 862-026 WARNING: DO NOT GO NEAR THE CHECK VALVES WHEN YOU PRESSURIZE THE ENGINE
_______ PNEUMATIC DUCTS. THE ENGINE BLEED AIR CAN CAUSE INJURY TO PERSONS WHEN THE BLEED AIR GOES OUT THROUGH THE CHECK VALVE OPENING.
 (12) Pressurize the pneumatic ducts for the right engines (No. 3 and 4): NOTE: This procedure will remove the oil contamination from the
　
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