MIL-PRF-29250C
ISO 1161. The payload (container and contents) shall be not greater than 25,000 lb (11 340 kg)
gross weight. The center of gravity (CG) of the container may vary longitudinally and laterally
5 percent. The vertical CG shall be not greater than 2.5 ft (762 mm) above the 4.25 ft by 8 ft by
8 ft by 20 ft (1 295 mm by 2 438 mm by 6 096 mm) container floor; 4 ft (1 219 mm) above the
8 ft by 8 ft by 20 ft (2 438 mm by 2 438 mm by 6 096 mm) and 8.5 ft by 8 ft by 20 ft (2 591 mm
by 2 438 mm by 6 096 mm) container floor. The design of the ILJS shall be able to accommodate
the variable CG. Any test payload shall be in an 8 ft by 20 ft (2 438 mm by 6 096 mm) ISO
container weighing 25,000 lb (11 340 kg).
3.9 Performance characteristics. The following performance criteria shall be applicable to the
ILJS configured in both the inboard and the outboard mode. Inboard mode is defined as the ILJS
configured with the corner jack assemblies attached to the end walls of the ISO container.
Outboard mode is defined as the ILJS configured with the corner jack assemblies attached to the
side walls of the ISO container.
3.9.1 Lifting with ILJS. The ILJS shall be designed so that no mechanism shall require external
power or externally renewed power other than the manpower provided by the crew to position,
attach, lift, and prepare the container for movement. The container shall be lifted manually to
66 inches (1 676 mm) in not more than 15 minutes by four people.
3.9.2 Steering and turning ability. The ILJS, when fully loaded (see 3.8), raised to a towing
height of 18 inches (457 mm), and with prime mover operating, shall turn right and left without
damage or interference with towed container or prime mover. The 18-inch (457 mm) towing
height shall be measured from ground surface to the bottom of the container.
3.9.3 Controllability over surfaces. The ILJS, when at an 18-inch (457 mm) towing height and
loaded in accordance with 3.8, shall exhibit stability when towed over surfaces specified in 3.9.11
and table I. The 18-inch (457 mm) towing height shall be measured from ground surface to the
bottom of container.
TABLE I. Towing mobility requirements.
Surface course
Maximum speed
Average speed
Distance
Paved surfaces
5 mph (8.05 km/h)
2.5 mph (4.02 km/h)
1.0 mile (1.609 km)
Unpaved surface
2 mph (3.33 km/h)
1.0 mph (1.60 km/h)
0.5 mi. (0.805 km)
3.9.4 Longitudinal inclines. The ILJS, when at an 18-inch (457 mm) towing height and loaded in
accordance with 3.8, shall follow the towing vehicle without weaving to an extent which would
adversely affect the controllability of the ILJS when ascending or descending longitudinal inclines
having a 7 percent slope.
3.9.5 Side slope. The ILJS, when at an 18-inch (457 mm) towing height and loaded in
accordance with 3.8, shall follow straight behind the prime mover without slipping or upsetting
when operating either left or right on a surface having a 5 percent slope.
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