CURRENT PROBES
CURRENT
PROBES

MICROOHM METER
Union/Tee Fittings Figure 408

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 20-10-51
 ALL  ú ú 02 Page 415 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 764-022On installations in the wing fuel tank, refer to the procedure, Electrical Resistance Specifications in the Fuel Tank.
 (3)  S 354-023Repair the flareless fittings in the pressurized areas, struts, fuel tanks and cargo areas. Refer to Flareless Tubing Assembly -Approved Repairs (20-10-51/401).
 (4)  S 794-024Do a leak test: (a) Pressurize the system for 5 minutes minimum. (b) With the system pressurized, rub the tube and fitting with a clean white cloth to find hydraulic leakage.
 NOTE:____ If there is leakage, you can tighten the tube again to the specified torque. If leakage comes into view in the subsequent pressure tests, replace appropriate parts.
 (5)  S 204-043If you disconnected more than one hydraulic tube and you think there is a possibility you connected the tubes incorrectly or cross-connected the tubes, do an operational check:
 NOTE:____ Use your own judgement to determine if a check is necessary.
 (a)  Do the post-installation test of one or more components to which the tubes are connected as a check.
 (6)  S 204-044If you disconnected electrical wires to get access to the hydraulic tubes and you think there is a possibility that you connected the wires incorrectly or cross-connected the wires, do an opertional check:
 NOTE:____ Use your own judgement to determine if a check is necessary.
 (a)  Do the post-installation test of one or more of the components in the system which uses the wires as a check.

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 20-10-51
 ALL  ú ú 02 Page 416 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 TASK 20-10-51-224-005
 6. Tubing Clearances
_________________
 A. Clearances
 S 224-008
 (1)  The minimum clearance for all mechanical systems except hydraulic tubing will be from adjacant structure, fixed structure, fixed and moving equipments and other tubing and fitting connectors will be as follows:
 (a)  
Supported locations 0.10 inch

 (b)  
Unsupported locations 0.20 inch

 (c)  
Supported and unsupported locations for flammables gas, fuel, and oxygen systems will be 2.0 inches from electrical wires and cables.

 S 224-007
 (2)  Minimum clearance for hydraulic system.
 (a)  
A minimum 0.06 inch for tubes supported to structure or other rigid members.

 (b)  
A minimum of 0.25 inch with adjacent structure, tubing or connectors, or other installations.

 (c)  
A minimum of 0.25 inch in areas where relative motion of adjoining components exists.

 (d)  
A minimum of 0.06 inch between individual coils of all coiled tubes.

 (e)  
A minimum of 0.05 inch between electrical wiring installations.

 S 434-026
 (3)  
Install hydraulic tubes with minimum force on the clamps and/or tubing.

 S 224-027

 (4)  
Make sure that at locations with clamps, the tubes are clear of the adjacent structure by a minimum of 0.10 inch. Where the tubing is clamped directly to the structure, the clearance can be the thickness of the clamps.

 S 224-028

 (5)  
Make sure that at locations without clamps, all the rigid lines are clear of the adjacent structure and equipment installations by a minimum of 0.25 inch.

 S 224-029

 (6)  
Make sure the clearance with the position of a mechanism is not less than 0.38 inch. This clearance can be 0.25 inch at locations with clamps which cannot be rubbed or touched.

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