(5)
Remove and discard the O-rings.

 TASK 21-51-02-402-011
 3.  Flexible Full Coupling Installation (Fig. 201)___________________________________
 A.  Equipment
 (1) Coupling gage - ST8709 H (optional)
 B.  Consumable Materials
 (1) D00128 Petrolatum VV-P-236
 C.  References
 (1) AMM 20-10-44/401, Lockwire
 D.  Procedure
 S 422-016
 (1) Install the flexible full coupling on the ducts as follows:
 (a)
Make sure the coupling is installed on duct A.

 (b)
Make sure the coupling nut is installed on duct B.

 CAUTION:_______DO NOT TWIST THE RETAINING RING OUT OF SHAPE. IF THE RETAINING RING IS DAMAGED, AIR LEAKAGE AT THE DUCT JOINT COULD OCCUR.

 (c)
Put one new retaining ring on each ferrule.

 (d)
Lubricate two new O-rings with petrolatum.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
COUPLING NUT
A
COUPLING

A
DUCT B
O-RINGS COUPLING NUT
COUPLING LOCKWIRE
FERRULE
FERRULE FERRULE
DUCT A
ASSEMBLED VIEW
DUCT A
DUCT B
RETAINER HALVES RETAINING RINGS
A-A
O-RING
COUPLING DUCT B NUT
FERRULE
DUCT A
O-RING RETAINING RING
COUPLING
RETAINER HALVES
EXPLODED VIEW
RETAINING RING
Flexible Full Coupling Installation
Figure 201 (Sheet 1)

 F67165
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

FERRULE
NOMINAL DUCT SIZE (in.)  COUPLING SIZE (AS1712)  GAGE MAX.  GAGE MIN.  ST8709H NO. GAGE 
0.50  -8  0.59  0.47  1 
0.625  -10  0.59  0.47  1 
0.75  -12  0.69  0.55  2 
1.00  -16  0.75  0.60  3 
1.25  -20  0.75  0.60  3 
1.50  -24  0.93  0.76  4 
1.75  -28  0.93  0.76  4 
2.00  -32  0.93  0.76  4 
2.25  -36  0.93  0.76  4 
2.50  -40  0.93  0.76  4 
3.00  -48  0.93  0.76  4 
3.50  -56  1.03  0.88  5 
4.00  -64  1.03  0.88  5 
4.50  -72  1.16  0.99  6 
5.00  -80  1.39  1.22  7 
5.50  -88  1.39  1.22  7 

DIMENSIONAL REQUIREMENTS FOR ASSEMBLING FLEXIBLE FULL COUPLING FLEXIBLE FULL COUPLING DIMENSIONS Flexible Full Coupling Installation Figure 201 (Sheet 2)
 F65610
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 ALL  ú ú 01 Page 203 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 CAUTION: DO NOT USE THE SAME O-RING FOR THE DUCT FITTINGS AFTER YOU
_______ TIGHTEN THE COUPLING ONE TIME. YOU MUST INSTALL A NEW O-RING OR AIR LEAKAGE AT THE DUCT JOINT CAN OCCUR.
 (e)  
Put one new O-ring on each ferrule.

 (f)  
Align the ends of duct A and duct B with a 0.15 |0.05 inch clearance between the ferrules.

 (g)  
Put the retainer halves together on the ferrules to connect duct A and duct B.

 CAUTION:_______DO NOT USE TOOLS TO TIGHTEN THE DUCT FITTINGS. DAMAGE TO THE FITTING COMPONENTS COULD OCCUR OR THE ADJACENT FITTINGS COULD LOOSEN.

 (h)  
Manually tighten the coupling nut to the necessary dimension in in (Fig. 201).
　
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