(d)  
Tighten the two clamp nuts to 42 - 48 pound-inches

 (4.75 - 5.42 newton-meters).
 S 434-021
 (8)  
Install the retainer (1), sleeve (2) and seals (3) on the compressor inlet duct (AMM 36-11-01/401).

 S 434-022

 (9)  
Install the couplings (4, 10 and 12) and the O-rings (5, 11 and 13) on the compressor outlet, the turbine inlet, and the turbine bypass inlet ducts (AMM 36-11-01/401).

 S 434-023

 (10)
 Install the coupling (6) on the conditioned air outlet duct.

 G. Do the Installation Test for the Air Cycle Machine (ACM)
 S 864-024
 (1)  Operate the applicable (1, 2, or 3) air cooling pack
 (AMM 21-00-00/201).

 S 794-025
 WARNING:_______DO NOT TOUCH THE PACK DUCTS. WHEN THE PACKS ARE ON, THE PACK DUCTS ARE HOT AND COULD CAUSE INJURY TO PERSONS.
 (2)  Feel for leaks around all of the ACM connections (6 locations).
 (a)  
Small leaks are permitted.

 (b)  
You must repair a large leak.

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747-400 MAINTENANCE MANUAL
 H. Put the Airplane to Its Usual Condition
 S 864-026
 (1)  
Do the procedure to stop the applicable air cooling pack (AMM 21-00-00/201).

 S 414-027

 (2)  
Close the applicable access door 191A-L, 191H-L or 192A-R (AMM 06-09-03/201).

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747-400
MAINTENANCE MANUAL

 WATER SEPARATOR - MAINTENANCE PRACTICES
_______________________________________
 1. General
_______
 A. This procedure has these four tasks:
 (1) The first task is a functional test of the water separator.
 NOTE: This test is used to determine if the water separator needs
____ to be removed and cleaned. This test is the same for each of the air conditioning packs.
 (2)  
The second task is the removal of the water separator.

 (3)  
The third task is the cleaning of the water separator.

 (4)  
The fourth task is the installation of the water separator.

 TASK 21-51-05-702-001
 2. Water Separator - Functional Test
__________________________________
 A. General
 (1)  This test will measure the differential pressure across the inlet and the outlet of the water separator to determine if you must clean the coalescer bag. This test can be used as a method to prevent the occurence of water and/or ice in the airplane cabin interior. The water separator coalescer bag must be clean and the Pack Temperature Control system must operate properly to prevent the occurence of water and/or ice in the airplane cabin interior. If the coalescer bag becomes dirty and clogged, or if there is a Pack Temperature Control system problem which causes the pack outlet temperature to be excessively cold and causes ice to form on the coalescer bag, the differential pressure across the water separator will be high. If the differential pressure is more than or equal to 3.5 psid
 (24.1 kPa), the water separator relief valve will open and the conditioned air from the pack will bypass the coalescer bag and permit water and/or ice to occur in the airplane cabin interior.
 B. Equipment
 NOTE: Airplanes with the WATER SEP DELTA P indication shown on the
____ EICAS ECS maintenance page can use this EICAS indication in place of the test equipment listed below to measure the differential pressure across the water separator.
 (1)  Manometer - Pressure; 0 to 4.5 psid (0 to 30 kPa), Model No. 2204 (Model No. 2000-30/kPa) Dwyer Instruments Inc., Michigan City, Indiana
 C. References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
　
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