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A
737-300/400/500MAINTENANCE MANUAL
 FLEXIBLE COUPLING ASSEMBLY - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  The flexible coupling assemblies connect the ducts to the air cycle machine (ACM).
 B.  It is not easy to connect the ducts to the ACM if you do not assemble the coupling correctly.
 TASK 21-51-61-004-001
 2.  Remove the Flexible Coupling Assembly (Fig. 401)_____________________________________
 A.  Access
 (1)  Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 B.  Procedure
 S 034-003
 (1)  
Remove the clamp.

 S 034-004

 (2)  
Raise the edge of the sleeve adjacent to the component being removed and push the sleeve over until its edge rides on the outer surface of the ring. (See detail A, Fig. 401.)

 S 984-005

 (3)  
Slide sleeve and ring on component not being removed until retainer is revealed.

 (4)  
Remove the retainer.

 S 024-006
 TASK 21-51-61-404-002
 3.  Install the Flexible Coupling Assembly (Fig. 401)______________________________________
 A.  Access
 (1)  Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

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737-300/400/500MAINTENANCE MANUAL
 B.  Procedure
 S 434-007
 (1)  Do these steps if you will install a new coupling or sleeve:
 (a)  
Put the ring into the sleeve at a 90° angle, then turn the ring to align it with the sleeve.

 (b)  
Do not put the ring fully into the sleeve.

 1)  Keep one edge of the sleeve on the outside surface of the ring.

 (c)  
With the exposed edge of the ring toward the joint, slide the ring and the sleeve onto the duct until the bead is exposed.

 S 984-008
 (2)  
Align the duct as shown in Fig. 401.

 S 434-009

 (3)  
Install the retainer.

 S 434-010

 (4)  
Move the sleeve and the ring over the retainer.

 (5)  
Move the sleeve over both the ring and the retainer.

 (6)
Install the clamp and tighten the nut to 90 to 95 pound-inches.

 S 434-011
 S 434-012
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
AIR CYCLE 
MACHINE 
SEE B 
AIR CONDITIONING 
EQUIPMENT BAY 
SEE  A 
FWD 
AIR CONDITIONING EQUIPMENT BAY 
A 

FWD  FLEXIBLE COUPLING SEE C , D 
Flexible Coupling Assembly Figure 401 (Sheet 1) B AIR CYCLE MACHINE

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A 737-300/400/500MAINTENANCE MANUAL

CLAMP  CLEARANCE  MAXIMUM ANGULARITY  OFFSET
MAX  MIN 
ACM COUPLING 3 INCH OD OR LESS  0.18  0.03  3`  PERMITTED NOT 
ACM COUPLING OVER 3 INCH OD  0.18  0.03 2` 

FLEXIBLE COUPLING TOLERANCE CHART

Flexible Coupling Assembly
　
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