TASK 70-11-00-400-001
1 . General.
This section gives the necessary instructions to safety parts with safety wire, safety cable, cotter pins, or tab washers. These devices are not designed to hold torque. The function of fastener retention devices is to oppose the forces that would cause the fasteners or other parts to loosen. Unless specified differently, all procedures that refer to safety wire can use safety cable. For safety wire, refer to Subtask 70-11-00-400-011, Safety Wire Practices. For safety cable, refer to Subtask 70-11-00-400-011, Safety Wire Practices.
2 . Safety Wire Practices.
Subtask 70-11-00-400-011
A.Safety wire is installed through, or around, a maximum of three parts in such a way that as the fastener or parts loosens, the safety wire will tighten. When the safety wire tightens it will not permit the fastener or part to turn. Refer to TASK 70-11-01-400-005, Safety Wire Procedure, for more information on safety wire practices. Safety cable and safety wire can be used interchangeably as alternative to each other unless otherwise is prohibited by the process document.
3 . Safety Cable Practices.
Subtask 70-11-00-400-012
A.Safety cable is installed through a maximum of three parts in such a way that as the fastener or parts loosens, the safety cable will tighten. When the safety cable tightens it will not permit the fastener or part to turn. Refer to TASK 70-11-02-400-006, Safety Cable Procedure, for more information on safety cable practices. Safety cable can be used when safety wire is specified unless specifically prohibited by the assembly procedure.
4 . Cotter Pin Practices.
Subtask 70-11-00-400-013
CAUTION:
DO NOT EXCEED MAXIMUM TORQUE WHEN TIGHTENING FASTENERS.
A.Tighten the castellated nut to the low side of the specified torque range, and continue tightening until a slot aligns with the hole in the bolt shank. See Figure 1.
CAUTION:
COTTER PINS ARE NOT REUSABLE. USE NEW COTTER PINS FOR EACH ASSEMBLY.
B.Install the cotter pin with the head seated firmly in the slot of the nut. Bend prongs of cotter pin so that the head and upper prong are firmly seated against the bolt.
Figure 1   Safety With Cotter Pin
5 . Tab Washer Practices.
Subtask 70-11-00-400-014
CAUTION:
TAB WASHERS ARE NOT REUSABLE. USE NEW TAB WASHERS FOR EACH ASSEMBLY.
A.Fit the tab washer so that the locking tab is butted against any tendency to untighten. See Figure 2.
B.Bend the locking tab snugly against flat of nut. See Figure 2 for the correct and incorrect method of bending.
Figure 2   Safety With Tab Washer