20. Lifting Clevis Assembly (Sheet 6, View T)
During AH-1, UH-1, and OH-58A and OH-58C helicopter recovery operations, the lifting clevis assembly replaces
slings as the primary attachment devices to the main rotor assembly of the disabled helicopter. Components of the
lifting clevis assembly include a clevis sub-assembly, a locking pin, and a quick release pin.
The clevis sub-assembly consists of a clevis, two clevis pins, and a pivot block. The clevis pins are used to attach
the clevis to the pivot block. The pivot block acts as a universal joint allowing movement in both fore-and-aft and
side-to-side directions. The locking pin is used to attach the lifting clevis assembly to the helicopter hub nut lug.
The quick release lock pin is used to secure the locking pin into position. Wire ropes are used to attach the locking
pin and the quick release pin to the clevis sub-assembly.
21. Shackle Assembly (View U)
The shackle assembly is used to connect two or three slings in a series-parallel configuration. Components of the
shackle assembly include a clevis, a clevis pin, a sling spacer, and a quick release pin. The clevis pin and quick
release pin are interconnected by wire rope.
22. Cargo Hook Thimble (View V)
The cargo hook thimble is installed inside the eye of the heavy weight black/white sling that will be attached to the
center cargo hook of a CH-47 recovery helicopter. The cargo hook thimble prevents the sling from riding forward
on the hook.
23. Crossbar Assembly (Sheet 7, View W)
The crossbar assembly is used to provide a load path around the AH-64D mast-mounted assembly (MMA) or the
OH-58D mast-mounted sight (MMS). The crossbar assembly consists of a crossbar housing, four tube
assemblies, and four quick release lock pins.
The metal crossbar housing is X-shaped with four arms positioned 90-degrees apart. Each arm of the crossbar
housing has a hole bored through the top and bottom surfaces. The bottom of the crossbar housing is fitted with a
foam fitting which centers the crossbar housing on the MMA or MMS and protects it during transportation of the
helicopter. The foam also allows for assembly of the crossbar on the antenna or sight.
Each tube assembly is fitted with a sling lug fitting on the outboard end. The sling lug fitting is equipped with a
spring lock. A hole is bored through the inboard end of each tube assembly. Quick release pins are used to
connect the tube assemblies to the crossbar housing.
24. Shipping Containers (Sheet 8, View X)
UMARK components are packaged in three watertight, nuclear/biological/chemical (NBC) contamination
survivable containers. Each container is equipped with recessed latches, hinges, handgrips, and a pressure relief
valve. Ribs molded into the top and bottom of each container interlock for stacking. When packed with UMARK
equipment, two personnel using the recessed handgrips can carry each container. The handgrips can also be
used as tie-down points during transportation.
25. Drogue Chute (View Y)
The drogue chute may be deployed during recovery operations to maintain aerodynamic stability. The drogue
chute must also be deployed when recovering any heavily damaged helicopter when either the vertical or
horizontal stabilizer is broken off.
END OF WORK PACKAGE
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