A-A-58045B
20F, or when specified (see 7.2 d), a heavy-duty (type A) winterization package good for storage
down to minus 65F and starting to minus 40F. Winterization package components with external
power requirements shall be compatible with 110VAC/20A circuitry. For each winterization
package, a breakdown of the winterization components and requirements (recommended coolant
ratios, oil types and viscosities, etc., for the various temperature ranges) shall appear in the TO.
The tow tractor shall meet applicable 50-state exhaust and evaporative emissions standards in
effect at the time of vehicle manufacture. The tow tractor shall include an anti-restart, as well as
a neutral safety start feature. Engine shall have an automatic engine shutdown system for high
coolant temperature and low oil pressure. Transmission shall be of the power-shift type, with an
integral, limited-slip, inter-axle differential. Maximum allowable transmission temperature
during all operations shall not exceed 260 degrees F. Axles shall be planetary-drive/steer axles.
3.5 Driveline and steering. The tow tractor shall have four-wheel drive, and two-wheel and
four-wheel power steering. Four-wheel steering shall feature both crab and coordinated steering.
The selection of the steering mode shall be accomplished by the movement of a one-hand-
operated lever or switch. When switching from the crab or coordinated four-wheel mode of
steering to the two-wheel mode of steering, the rear wheels shall center automatically (wheels
perpendicular to axle) as the steering wheel is rotated to the wheel center, without additional
operator input or adjustment. The tow tractor shall have a maximum wall-to-wall turning radius
of 18 feet or less while in four-wheel coordinated steering mode. Wheel-wells shall be designed
so that tire chains may be used without interference.
3.6 Electro-magnetic interference (EMI). The tow tractor shall comply with EMI requirements
of MIL-STD-461 for Radiated Emission per RE102, and Radiated Susceptibility per RS103 for
Air Force ground equipment.
3.7 Mobility. The tow tractor shall be capable of traveling a minimum of 15 miles per hour
(MPH) forward and 2.5 MPH in reverse on flat asphalt or concrete surfaces without a trailing
load. Additionally, the tow tractor shall be capable of towing a 500,000 pound load on a 1%
grade at a minimum of 2.5 MPH on asphalt or concrete surfaces. An externally-mounted back-
up warning alarm shall be included in the reverse lights circuit.
3.8 Suspension. On occasion the tow tractor will leave the flight lines and roads within the
perimeter of the base, and enter both paved and unpaved surfaces. The angle of each surface
relative to the other can differ. The tow tractor shall have a suspension that will allow for
articulation of one or both of the tow tractor's axles, so that an axle's position relative to the
other will allow for four-wheel contact with the normal working surfaces found in the above
described conditions.
3.9 Wheels and tires. The tow tractor shall be equipped with steel disc wheels and tubeless
steel belted radial tires with an appropriate tread pattern. The valve stems may be rubber or
metal, but the valve stem caps shall be vinyl or plastic. The wheels and tires shall be in
accordance with (IAW) the Tire and Rim Association recommendations for this application. All
wheels and tires shall be uniform. Tire inflation pressures shall be noted on all wheel well
openings, and shall be in accordance with Air Force Technical Order (T.O.) 36-1-191. If tire
loads and tire inflation pressures that exceed the specifications on the tire sidewall markings are
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