MIL-DTL-23599B(AS)
3.2.1 Hook assembly. The rescue hook (see 6.4) shall consist of a single hook and an
auxiliary ring. The auxiliary ring (see 6.4) shall be located on the lower aft part of the hook and
shall be an integral part of the forging or casting.
3.2.2 Hoisting operations. The rescue hook shall be able to contain and support the
equipment necessary for all hoisting operations.
3.2.3 Dimensions. The rescue hook shall be designed within the following dimensional
constraints:
3.2.3.1 Hook diameter. The hook throat shall be compatible with standard rescue
devices such as litters, straps, baskets, and penetrators (see 6.3). The hook shall be capable of
simultaneously containing a minimum of 5 lifting rings (see 6.4) with a circular cross section of
0.35 inch.
3.2.3.2 Auxiliary ring diameter. The auxiliary ring shall be sized so as not to compromise
or interfere with the function of the hook. The ring shall accommodate a 10,000 pound (lb.)
locking carabiner.
3.2.4 Swivel fitting. The hook shall be capable of being configured with a swivel fitting in
accordance with MS18027 and accommodate, at a minimum, a 10,000 lb. locking carabiner.
3.3 Performance.
3.3.1 Hook Strength.
3.3.1.1 Static proof loads. When tested as specified in 4.6, the rescue hook shall support the
following static proof loads and shall not exhibit elastic deformation:
a. Hook
4,200 lb.
b. Auxiliary Ring
4,200 lb.
c. Swivel Fitting
4,200 lb.
3.3.1.2 Static ultimate loads. When tested as specified in 4.6, the rescue hook shall support
the following static ultimate loads while maintaining hook functionality. Plastic deformation is
allowed under the condition that the safety latch is able to remain in a closed and locked
position:
a. Hook
6,300 lb.
b. Auxiliary Ring
6,300 lb.
c. Swivel Fitting
6,300 lb.
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