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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 434-021-C00
 (6)  
ENGINES WITH CFMI SB 72-426; Attach the bleed valve to the air diffuser with a V-band clamp and self-locking nut.

 S 434-013-C00

 (7)  
Install the elbow on the bleed valve as follows:

 (a)  
Install the jamnut on the elbow fitting.

 1)  Turn the jamnut until it is farther than the O-ring groove and on the second section of the threads.

 (b)  
Lubricate the first section of threads and the O-ring groove
 with petrolatum.

 (c)  
Install a new O-ring in the groove even with the second section of threads.

 (d)  
Turn the jamnut until it lightly touches the O-ring.

 (e)  
Turn the elbow into the air signal port until the O-ring
 immediately touches the countersunk surface of the valve.

 (f)  
Adjust the elbow fitting to point to the air signal tube.

 

 S 434-014-C00
 (8)  
Loosely connect the air signal tube to the fitting on the elbow.

 S 434-015-C00

 (9)  
Turn the air signal port 25-30 degrees from the valve center line in the clockwise direction.

 NOTE: The 5th stage start bleed valve must be turned 25-30 degrees
____
 clockwise from the center line for sufficient clearance
 between the valve elbow fitting and the thrust link.

 S 434-022-C00
 (10) ENGINES WITHOUT CFMI SB 72-426; Tighten the V-band clamps to 55-70 pound-inches (6.3-8.0 Newton meters) (AMM 70-20-02/201).
 (a)  Safety the clamp nuts together with a lockwire.
 S 434-023-C00
 (11)
 ENGINES WITH CFMI SB 72-426; Tighten the V-band clamps to 55-70 pound-inches (6.3-8.0 Newton meters).

 S 434-016-C00

 (12)
 Make sure the torque on the bolts that attach the strap across the air diffuser tube is 55-70 pound-inches (6.3-8.0 Newton meters).

 S 434-017-C00

 (13)
 Tighten the jamnut that attaches the elbow to the bleed valve to 180-200 pound-inches (20.5-22.7 Newton meters).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-34-01
 ALL  ú ú C01 Page 405 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 434-018-C00
 (14)
 Tighten the tube nut that attaches the air signal tube to the elbow to 270-300 pound-inches (30.7-34.1 Newton meters).

 S 414-019-C00

 (15)
 Close the left thrust reverser half (AMM 78-31-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-34-01
 ALL  ú ú C01 Page 406 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.

 

　
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