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|  MIL-S-62549(AT)
In addition, the connection between circuit 2 and 6, on the 7 pin connector, shall have a readily
accessible external switch to allow for breaking of this circuit when the 7 pin connector is
attached to the towing tractor in lieu of the 12 pin MS connector. Circuits b and j on tactical
truck tractors are combination stop and turn signal indicator circuits. The normal 12 V turn signal
lights will function both as turn signals and stop lights and the normal 12 V stop lights will not be
in operation when the semitrailer is connected to a towing vehicle with a 24 V power supply.
Because of this condition., the number 4 stop light circuit is not connected to the 24 V, 12 contact
receptacle.
3.4.17 Transportability. The semitrailer shall be capable of being transported by rail, air and
marine modes worldwide. The applicable transportability criterion is set forth in MIL-STD-1366.
Preparation of the semitrailer to be transported by any mode shall be accomplished in 15 minutes
(min) (total) or less by no more than two individuals using only tools on board. Storage on the
vehicle shall be provided for all parts removed from the semitrailer.
3.4.17.1 Slinging provision. The semitrailer shall be equipped with lift points to permit
slinging a fully loaded semitrailer in accordance with class 1 or 3, type II of MIL-STD-209.
3.4.17.2 Rail impact. The fully loaded semitrailer shall withstand rail impact testing in
accordance with MIL-STD-810, method 516, procedure VIII without any damage or degradation
in performance.
3.4.17.3 Air transport. The semitrailer shall be air transportable by the C130 aircraft in
accordance with the criterion set forth in MIL-A-8421.
3.4.17.4 Vehicle tiedown. The semitrailer shall be equipped with a minimum of eight
tiedowns on each side, and each tiedown shall be capable of withstanding a load of not less than
45,000 lb without failure or permanent deformation when the load is applied at an angle up to 45
from the longitudinal axis. Tiedown hardware to permit transportation of the vehicle in
accordance with Type II, Class 2 of MIL-STD-209 shall be provided. Instruction shall be
included for component removal when required for transport. The tiedown procedure shall
permit tiedown of the vehicles to the floor (or deck) of the transport medium in such a manner as
to prevent shifting or movement in any direction.
3.4.17.5 Lashing rings. Minimum 16 each, D-rings recessed around the perimeter of the
semitrailer; two on gooseneck, two on the deck top at the rear of the load bed, and the remaining
equally spaced on each side of the frame including suspension area. Each D-ring shall be of
manufacturers heavy duty type. The tiedown provisions will permit securement of equipment in
accordance with MIL-STD-209, for Type II equipment and Class 5 cargo tiedown provisions.
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