(c)
If the wire bundle diameter is such that the clamp does not firmly grip the wire bundle, wrap the bundle with additional tape to obtain a proper grip.
(3) Install protective covers for connectors and receptacles not connected. Lockwire all threaded connectors after installation.
E. Tubes and Fittings
(1) Proper alignment must be obtained between fittings and tubing to prevent preloading of lines and assure proper mating of threaded parts.
Table 9:
BETWEEN ALL RIGID LINES AND ADJACENT STRUCTURE 0.50 INCH -AT NON-SUPPORTED LOCATIONS 0.10 INCH -AT SUPPORTED LOCATIONS (OR THE THICKNESS OF THE SUPPORTING CLAMPS WHEN THE TUBING IS CLAMPED DIRECTLY TO THE SUPPORTING STRUCTURE)
NEAR ANY POSITION OF AN OPERATING MECHANISM 0.50 INCH -AT NON-SUPPORTED LOCATIONS 0.10 INCH -AT SUPPORTED LOCATIONS WHEN IT IS EVIDENT THAT NO CHAFING OR INTERFERENCE WILL RESULT
BETWEEN TUBES THAT CROSS OR RUN PARALLEL 0.50 INCH -OR THE DISTANCE MEASURED BETWEEN TUBES AT CLAMPBLOCKS WHEN TUBING RUNS ARE MAINTAINED PARALLEL BY CLAMPBLOCKS, WHICHEVER IS SMALLER; OR THE DISTANCE RESULTING FROM BACK-TO-BACK CLAMPING (ADDITIONAL BACK-TO-BACK CLAMPING MAY BE USED TO MEET MINIMUM CLEARANCE REQUIREMENTS)
NOTE: Tubing installations shall be considered supported for a distance of 3 inches from a B-nut that attaches a tube to a rigid place of equipment.
(2) Allowable preload shall not exceed the following limits at clamp points when end fittings are attached and torqued.
Table 10:
Tube Size Max. Preload
5/8" & Larger 20 lbs.
1/2" 10 lbs.
3/8" 5 lbs.
INTRODUCTION
Page 12 May 05/2009
(Continued)
Tube Size Max. Preload
1/4" 3 lbs.
(3) Up to three BACS18AF spacers may be used under support clamp to meet preload limitations.
F. Safety Devices
(1)
Perform all lockwiring using double twist method per Standard Overhaul Practices Manual, 20-50-02 and Standard Industry Practice.
(2)
Use of safety cable in place of lockwire is allowed when specified in the applicable installation. Safety cable can only be used with 0.250 inch or smaller bolts which have center drilled heads. Refer to Standard Overhaul Practices Manual, 20-50-02 for usage instructions.
CAUTION: EXTREME CARE MUST BE TAKEN TO PREVENT CONTAMINATION FROM ENTERING THE PNEUMATIC DUCTS, FLUID LINES, DRAIN LINES AND ENGINE PORTS.
G. Cap all open ports and lines with shop approved devices if equipment is to be left unattended or disconnected for extended periods.
9. Part Substitution
A. Preferred parts are listed first and are applicable to the engine buildup configuration which was installed on the most recent engine configuration to be delivered.
B. Replaced by parts should not be used on new engines but may be required for buildup of previous engine configurations.
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