MIL-PRF-27260D
work gloves shall not cause interference with the operation of the tensioning and release
mechanism (see 4.7.1.1).
3.8
Performance.
3.8.1 Proof load.
The tie down shall be capable of withstanding a proof load of 5,000 pounds for 30 seconds without
slippage of the strap through the adjustment device. Damages such as broken stitching, torn or
frayed strap, and deformation or rupture of hardware shall not be permitted. The tie down shall
be fully operational at the completion of this test (see 4.7.4).
3.8.2 Ultimate load.
The tie down shall be subjected to an ultimate load of 6,000 pounds for 30 seconds. Damage
such as broken stitching without complete separation, torn or frayed strap without complete
separation of the strap, and deformation but not rupture of hardware will be permitted. The
release mechanism shall be operable at the completion of this test (see 4.7.4.1).
3.8.3 Adjusting mechanism.
The tie down strap shall be capable of allowing the strap to be freely adjusted to any length within
the limits as shown on Figure 5. It shall be possible to accomplish preliminary adjustments of the
strap to the approximate length required in a maximum of 15 seconds. There shall be no
inadvertent disengagement of the fixed hook assembly while securing the cargo (see 4.7.1.2).
3.8.4 Tensioning mechanism.
The tensioning mechanism shall be of the progressive take-up-ratchet type or similar mechanism
and shall be capable of taking up a minimum of one foot of strap The tensioning mechanism
shall be capable of applying a tension of not less than 150 pounds using an applied force not to
exceed 50 pounds. No more than seven progressive take-ups shall be required to obtain 150
pounds of tension with 18 feet of strap between the hooks. The mechanical advantage of the
mechanism shall not exceed a ratio of 5:1 in the tightened position; the tensioning mechanism
shall lock in accordance with Figure 5, running approximately parallel with the hook. A lock shall
be incorporated in the tensioning mechanism and shall automatically engage upon completion of
the tensioning operation. The force required to disengage the lock shall not exceed 5 pounds
(see 4.7.1.2).
3.8.5 Tensioning mechanism strength.
The tensioning mechanism shall be capable of withstanding a minimum applied force of 300
pounds without permanent deformation or malfunctioning of the mechanism. The tensioning
mechanism shall be operable after completion of the test (see 4.7.1.2.1).
3.8.6 Release mechanism.
The release mechanism shall release the tensioning mechanism when actuated and shall
produce sufficient slack in the strap to permit removal of the attachment hooks from the tie down
rings. It shall be possible to manually release a tension load of 750 pounds with the applied force
not exceeding 60 pounds (see 4.7.1.3).
3.8.7 Strap strength.
The strap shall have a minimum tensile strength of 9,500 pounds (see 4.7.2).
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