MIL-DTL-23599B(AS)
3.3.1.3 Dynamic loads. When tested as specified in 4.6, the rescue hook shall support the
following dynamic loads without exhibiting plastic deformation. Following the dynamic testing,
the hook shall be non-destructively inspected for cracking using the methods in 4.5.3.1:
a. Hook
200,000 cycles at 2,100 lb.
b. Auxiliary Ring
200,000 cycles at 2,100 lb.
c. Swivel Fitting
200,000 cycles at 2,100 lb.
3.4 Safety latch. In order to prevent ring roll-out or reversal due to load release, torsion, load
jolt, etc., the rescue hook shall employ a spring latch (see 6.4) mechanism with a positive lock.
3.4.1 Lock. The lock (see 6.4) shall prevent the latch from opening unless the lock is
disengaged.
3.4.2 Operation. The locking arrangement shall be positive and easily operable with one
hand by personnel, providing rapid engagement and disengagement of the locking mechanism in
accordance with 5.9.11.4, push and pull forces, of MIL-STD-1472. A positive identification of
locked or unlocked status shall be provided by the mechanism.
3.4.2.1 Force. The force required to open the latch in operation shall be not greater than 9.5 lb.
3.4.2.2 Auto locking. Any latch with an automatic locking feature shall provide the ability
to disable the automatic locking function.
3.4.2.3 Disengagement. The lock design shall be resistant to inadvertent disengagement of
the lock resulting from contact and use expected in normal operations including:
a. Abrasion or sliding contact with structures
b. Impact with surfaces in multiple orientations
c. Normal handling or gripping by the operator or survivor
3.4.3 Latch strength.
a. The face of the safety latch shall be loaded to 900 lb in accordance with ANSI
Z359.1, 4.3.1.1.2, Gate Face Testing of Snaphook and Carabiner. The latch shall not
separate more than 0.125 inch from the nose of the hook during loading with no
permanent deformation or damage allowed to any components. The latch and lock
components shall function as intended after removal of the test load.
b. The side of the safety latch shall be loaded to 900 lb in accordance with ANSI
Z359.1, 4.3.1.1.3 Side Load Testing of Snaphook and Carabiner. The latch shall not
separate more than 0.125 inch from the nose of the hook during loading with no
permanent deformation or damage allowed to any components. The latch and lock
components shall function as intended after removal of the test load.
c. The face and side load tests shall be performed with the latch in the closed and locked
condition.
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