MOUNT ASSEMBLY WITHOUT JUMPER ASSEMBLYMOUNT ASSEMBLY WITH JUMPER ASSEMBLY
E E
DUCT ACM
1
CLEARANCE
CLEARANCE VERTICAL HORIZONTAL
CLAMP MAXIMUM OF 1 MAXIMUM OF 1MAX MIN
NOT PERMITTED COUPLING 3 INCH OD OR LESS 0.18 IN.
0.03 IN.
3`
COUPLING OVER 3 INCH OD 0.18 IN.
0.03 IN.
2`
FLEXIBLE COUPLING TOLERANCE CHART
1 ANGULAR DIFFERENCE BETWEEN DUCT AND ACM CENTERLINES.
Air Cycle Machine Installation Figure 401 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-51-11
ALL ú ú 02 Page 405 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 864-046
(16)
Pressurize the pneumatic system to approximately 25 psi with the APU or a ground source (Ref 36-05-00/201).
S 864-047
(17)
Put the RECIRC FAN switch on the overhead panel to OFF.
S 864-048
(18)
Operate the air cycle system (Ref 21-00-00/201).
S 864-049
(19)
Put the temperature switch to manual COOL until the air mixture valve moves to the fully COLD position.
S 864-050
(20)
Put the temperature switch to OFF.
S 714-051
(21)
When the system is stable, make sure the SUPPLY DUCT temperature is between 32°F and 40°F (0 and 4°C).
S 794-062
(22)
Examine the connections at the ACM duct clamps for leaks.
(a)
A small leak is O.K.
(b)
You must repair a large leak.
D. Put the Airplane Back to its Usual Condition.
S 864-071
(1)
Put the RECIRC FAN switch to AUTO.
S 864-069
(2)
Stop the air cycle system (Ref 21-00-00/201).
S 864-070
(3)
Remove the pneumatic power if it is not necessary
(Ref 36-05-00/201).
S 864-072
(4)
Remove the electrical power if it is not necessary
(Ref 24-22-00/201)
(5)
Close the bay doors for the air conditioning equipment.
S 414-073
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21-51-11
ALL ú ú 02 Page 406 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PACK OVERHEAT SWITCHES - REMOVAL/INSTALLATION
_____________________________________________
1. General_______
A. Two tasks are supplied in this procedure. The first task is the removal of the pack overheat switch. The second task is the installation of the pack overheat switch.
B. There are two pack overheat switches:
(1)
The overheat switch for the compressor discharge is in the compressor discharge line on the right side of the compressor for the air cycle machine (ACM).
(2)
The overheat switch for the turbine inlet is in the discharge duct from the secondary heat exchanger that goes to the turbine.
TASK 21-51-18-004-008
2. Remove the Pack Overheat Switches (Fig. 401)_________________________________
A. Access
(1) Location Zones
212 Left Air Conditioning Equipment Bay
214 Right Air Conditioning Equipment Bay
B. Prepare for the Removal
S 014-001
(1)
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