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CABLE GRIP The cable grip (which opens and closes on the cable) and a shackle enable the cable grip to be attached to the crewman's safety belt to take the weight off the hoist assembly during a hoist 239.411
Figure 5-22.-Cable grip. failure. The cable grip is capable of supporting 1,000 pounds. (See figure 5-22.) The cable grip is an emergency condition device used by personnel performing rescue operations from a helicopter when the rescue hoist has a malfunction that renders the hoist inoperable. The cable grip is used for quick temporary attachment to the hoist cable. Maintenance The aircrewman's responsibility for maintenance of the cable grip is limited to a freshwater wash and to informing maintenance control that it has been used. Repairs or other actions required are performed by organizationallevel maintenance or above. All cable grips are subject to a calendar inspection upon issue and at intervals of 225 days. To inspect the condition of the cable grip, proceed as follows: 1. Inspect for missing, bent, fractured or damaged components. 2. Check hardware for security of attachment, corrosion, wear, and ease of operation. 3. Check for sharp edges and projections. Cleaning Clean the cable grip every time it has been immersed in salt water. To clean it, proceed as follows: 1. Clean devices with an acceptable cleaning agent. 2. Remove all foreign objects with lowpressure air. 3. Lubricate all movable parts of the cable grip with lubricating oil. Wipe off any excess oil with clean, dry, lint-free cloth. PNEUMATIC RESCUE HAND TOOL The pneumatic rescue hand tool is a cartridgeoperated device. A chamber within the handle secures a 3,000 psi nitrogen gas cylinder, which provides a very powerful force against the cutting blade. The case is made of nylon webbing, 12 1/2 inches long and 5 3/4 inches wide at the top, tapering to 3 1/4 inches wide at the bottom. A 46-inch lanyard and baby swivel hook, attached to the upper grommet, are designed for
Figue 5-23.-Pneumatic rescue hand tool. attachment to the pneumatic rescue hand tool. (See figure 5-23.) The pneumatic rescue hand tool is designed for helicopter rescue crewman to use during air/sea rescue operations. The pneumatic rescue hand tool gives the crewman a readily available cable cutter and parachute harness webbing cutter. The tool can cut single strands of stainless steel cable up to 7/32 inch in diameter as well as harness webbing of thickness up to and including 1/4 inch and widths up to 1 3/4 inch, in single cuts. The pneumatic rescue hand tool, complete with case, should be readily available to the rescue crewman during rescue operations. Maintenance The aircrewman's maintenance of the pneumatic rescue hand tool is limited to a freshwater rinse. Repairs or other maintenance action required are done by organizational-level maintenance or above. The pneumatic rescue hand tool is inspected upon issue and at intervals not to exceed 225 days. The calendar inspection consists of a visual inspection and a functional test. To perform a visual inspection, proceed as follows: 1. Inspect all parts for corrosion, cracks, wear, and any other defects. 2. Inspect blade for sharpness. Sharpen, using an appropriate whetstone, or replace as necessary. 3. Inspect the anvil for scored surface. The functional test consists of the following tasks: 1. Leakage test. To perform a leakage test, proceed as follows: a. Pressurize the hand tool to 3,000 psi with a nitrogen cartridge. b. Immerse the pressurized hand tool in fresh water and rotate the tool in three directions to eliminate any trapped air in external pockets. c. Any leakage after 1 minute indicates a defective seal of the component from which the gas is escaping. Replace seals as necessary. 2. Trigger force test. To perform a trigger force test, proceed as follows: a. Mount the pressurized hand tool in an appropriate fixture, cradle or V-block. b. Using a push-pull scale, measure the trigger force necessary to actuate the blade on the first stroke. The force is applied midway on the finger area of the trigger. Two thicknesses of Type XIII, MIL-W-4088C, webbing should be cut. The trigger force is between 5 and 20 pounds. Trigger force outside this range indicates the need for repair of the trigger (forward) valve or the trigger assembly. 3. Performance. To conduct a performance test, proceed as follows: a. Cut a double thickness of webbing, and with the trigger in the depressed position, immerse the hand tool in water. b. Any leakage after 1 minute of immersion indicates the piston seal leaks or the exhaust (rear) valve leaks. c. Make 10 additional double webbing cuts. After the tenth cut, with the trigger depressed, immerse the hand tool in water. d. Check for leakage during 1 minute of immersion. Any leakage indicates the trigger (forward) valve is faulty. e. Make additional cuts of double webbing until the hand tool fails to cut through both thicknesses. The total number of cuts should exceed 10. f. Failure to make 10 cuts indicates maintenance is required. Cleaning Clean the pneumatic rescue hand tool after every immersion in salt water. To clean, proceed as follows: 1. Rinse the hand tool thoroughly in fresh water (preferably distilled) and air dry, using a forced warm air source. 2. After cleaning the hand tool, lightly coat the cutting edge of the blade with pneumatic grease. |
 
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