20-10-51
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 224-030
 (7)  When tubing goes through or across, or is parallel to other tubing, attach sufficient clamps to keep a clearance of 0.25 inch minimum. You can use the thickness caused from the back-to-back clamps.
 NOTE: It is permitted to use more back-to-back clamps as it is
____ necessary to get the correct clearance.
 S 224-031
 (8)  
To get the necessary clearances, you can use BACS18AF3 or BACS18AF4 spacers to get the necessary height when you use loop-type clamps. You can use BACS18AN spacers with the U-type clamp to get the necessary height. You cannot use NAS42 or NAS43 spacers on hydraulic system tubing.

 S 214-032

 (9)  
Do not use more than six spacers together. If you use more than four spacers, you must find the cause and correct it.

 S 224-033

 (10)
 Make sure the tubing is clear of the control cables between the break points or fairleads and the control linkage by a minimum of

 0.625 inch.
 S 224-034
 (11) Make sure the minimum clearance between the tubes in the clampblocks (65B80254) and the channels on the clampblocks is 0.060 inch. If this clearance is less than 0.060 inch, correct the spacer tube length (NAS43003-) or correct the force on the tubes in the clampblock.
 TASK 20-10-51-224-006
 7. Tubing Clamp Spacing
____________________
 A. Procedure
 S 224-036
 (1)  Keep the tube clamp spacing in the limits shown in Table 402 unless you are told differently.
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 20-10-51
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ~.......................................................................... | Normal Tube Clamp Maximum Spacing | | Table 402 | ............................................................................ | Tubing | | Usual | Special | | OD | | Clamp Spacing | Clamp Spacing | | (Inches) | Material | (Inches) | *[1] | ............................................................................ | 1/4 | Steel, Titanium | 16.0 | 12.0 | ............................................................................ | 3/8 | Steel, Titanium | 20.0 | 15.0 | ............................................................................ | 3/8 | Aluminum | 16.5 | 12.0 | ............................................................................ | 1/2 | Steel, Titanium | 23.0 | 17.0 | ............................................................................ | 1/2 | Aluminum | 19.0 | 14.0 | ............................................................................ | 5/8 | Steel, Titanium | 22.0 | 18.5 | ............................................................................ | 5/8 | Aluminum | 22.0 | 16.5 | ............................................................................ | 3/4 | Steel, Titanium | 27.5 | 20.5 | ............................................................................ | 3/4 | Aluminum | 24.0 | 18.0 | ............................................................................ | 1.0 | Steel, Titanium | 30.0 | 22.5 | ............................................................................ | 1.0 | Aluminum | 26.5 | 19.5 | ............................................................................ | 1 1/4 | Steel, Titanium | 31.5 | 23.5 | ............................................................................ | 1 1/4 | Aluminum | 28.5 | 21.0 | 2...............….................…........................…...............1
 *[1]  Use special clamp spacing for the Wing Rear Spar, Engine Strut, Engine Aft Fairing
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-10-51
 ALL  ú ú 01 Page 419 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLARELESS TUBING ASSEMBLY - APPROVED REPAIRS
____________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
　
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