MIL-DTL-25959H
3.7.1 Tensioning assembly. The tensioning assembly adjustment shall be capable of quickly
providing any adjustment within the range of 0 to at least 3.5 inches for the CGU-8/A, and 0 to at
least 4.5 inches for the CGU-7/A tie down tensioner device. Preliminary adjustment of the tie
down tensioner length shall be accomplished as specified (see 3.7.1.2). Final adjustment of the
tie down tensioner length shall be provided by a take-up in the tensioning adjustment control.
3.7.1.1 Ring attachment hook. One end of the tie down tensioner shall be provided with a flat
hook to permit rapid attachment of the tie down tensioner to a ring having a minimum clear open
diameter of 1.25 inches for the CGU-8/A and a minimum of 2 inches for the CGU-7/A tie down
devices. The stock cross-sectional diameter shall not be less than 0.875 inch for the CGU-8/A
and not less than 1 inch for the CGU-7/A. The tip of the hook shall be wedge-shaped so that
operating personnel can use the tensioning assembly to easily scoop up and attach the hook to tie
down rings on the aircraft floor. A spring loaded keeper shall be provided on the hook to prevent
inadvertent disengagement when the tie down tensioner is subjected to loads that fall within the
devices' working loads. Pressure of the ring against the keeper shall permit the ring to enter the
hook. The hook shall have the capability of swiveling and locking in two positions 180o from
each other and perpendicular to the locking release mechanism, so as to replace the MB-1 and
CGU-4/E with the CGU-8/A device and the MB-2 and CGU-3/E with the CGU-7/A device. The
hook shall be capable of rotating in both the clockwise and counterclockwise directions, and no
tools shall be required to rotate and lock the hook into the new position.
3.7.1.2 Chain attachment. As a preliminary adjustment, the opposite end of the tensioning
assembly shall be provided with a mechanism that will permit the tensioning assembly to be
quickly attached to any link of the chain assembly with the exception of the end links. This
attachment shall provide any tie down length within the limits imposed by the chain link
configuration and the lengths of the chain and tensioning assemblies. A spring loaded chain
attachment mechanism or similar positive automatic-acting system shall be provided so that the
chain will not become detached from the tensioning assembly during the operations required to
apply the tie down when in use. The chain shall not become detached due to any manipulation
of the chain including pushing, pulling, and twisting the links of the chain. Any design that
requires the chain assembly to thread through the tensioning assembly or requires manipulation
of the mechanism to attach the chain assembly shall not be acceptable. Under no conditions
shall the chain become detached from the tie down tensioner, unless removed/released by the
operator actuating the release handle; this includes pulling, tugging, whipping, etc. of the chain
in all directions in which the tie down tensioner and chain assembly can be manipulated at, or
moved into by dynamic loads/accelerations that may be experienced on the aircraft. The CGU-
8/A and CGU-7/A chain attachment mechanisms shall be capable of attachment to any chain that
falls within the dimensional requirements of MIL-DTL-6458, Types I and II, respectively.
3.7.1.3 Tensioning threads. Threads used for the primary tensioning mechanism where exposed
shall be tolerant of damage due to dropping that may impair tensioning ability. Threads shall
have a pitch no finer than that of unified coarse thread series (UNC) for the diameter used.
Alternative thread profiles may be used.
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