O-Ring Fittings
Figure 505
Assembly
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F. Procedure - Preparing and Installing Universal Fittings
Proper preparation, assembled, and tightening of Universal Fittings involves preparing the fitting threads, installing the gasket, and tightening the fitting nut to the specified torque value.
(1)
Assemble the nut onto the fitting, running the nut above the upper threads. (See
Figure 506, View A)
(2)
Apply a small amount of anti-seize lubricant to treads. (Refer to Table 503 to determine approved anti-seize lubricant.)
(3)
Assemble O-ring against upper threads, making sure the packing is not twisted.
(4)
Advance the nut until the top thread of the nut is flush with top thread of the fitting (See Figure 506, View B).
(5)
Assemble fitting into boss until O-ring lightly contacts boss (See Figure 506, View C).
NOTE: If position of fitting is not correct, rotate it out slightly until the fitting is in proper position.
(6)
Tighten nut to specified torque value. Do not back it out more than one turn.
Fittings with Lock Nuts
Figure 506
Assembly
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G. Procedure - Preparing and Installing Bulkhead Fittings
The locknut on bulkhead fittings should be torqued after the connecting tube or hose has been properly assembled.
NOTE: Refer to Figure 507 for an illustration of a properly assembled fitting, and Table 513 for specified coupling nut torque values.
Bulkhead Fittings
Figure 507
Assembly
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6. Lockwire Installation and Techniques
A. General
Appropriate diameter lockwire (specified in Aerospace Standard 567) is installed using the following techniques and techniques:
.
Install lockwire so that loosening tendency of a part causes tightening of the lockwire.
.
Ensure lockwire consists of two strands twisted together unless otherwise specified.
.
Pull lockwire taut while twisting and have approximately eight to ten turns per inch without being overstressed.
.
Install lockwire so no wear or excessive load to part is experienced.
.
Cut lockwire at the end of a series, leaving at least three full twists. Bend the end to eliminate safety hazard.
B. Lockwiring Examples Examples of lockwiring are shown in Figure 508 and methods are explained as follows:
.
Methods 1 and 2 apply to bolts and drilled head screws. The first section of lockwire is twisted clockwise and the second section is twisted counterclockwise.
.
Methods 3 and 4 apply to a single drilled head screw or a plug lockwired to a drilled point.
.
Method 5 applies to an adjustable connecting rod.
.
Methods 6 through 10 apply to various types of tubing assemblies.
Assembly
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Various Lockwiring Methods
Figure 508
Assembly
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7. Cotter Pins and Key Washers
CAUTION: COTTER PINS ARE NOT REUSABLE. INSTALL NEW COTTER PIN AS SPECIFIED IN APPLICABLE MANUAL FOR UNIT IN WORK.
A. Cotter Pin Installation
(1)
Install new cotter pins to lock nut as shown in Figure 509, View A.
(2)
Install new cotter pins to retain clevis pins or rod end as shown in Figure 509, View B.
Typical Installation of Cotter Pins
Figure 509
Assembly 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：标准施工手册 STANDARD PRACTICES MANUAL 20-00-02/70-00-01(116)
