A-A-58045B
conditions specified, and a breakdown of the winterization components and requirements for
each winterization package (recommended coolant ratios, oil types and viscosities, etc., for the
various temperature ranges) shall be submitted to the government representative at the first
production verification.
5.3.5 Driveline and steering. The first production tow tractor shall be demonstrated in two-
wheel steer and four-wheel steer, using both crab and coordinated steering. The tow tractor shall
be tested for verification of tire chain use without interference in wheel-wells. Tire chains shall
be fitted to the tires, and the tow tractor shall be operated by driving a short distance and turning
the wheels to the extreme left and right. The tow tractor shall be tested for verification of the
maximum wall-to-wall turning radius while in four-wheel coordinated steering mode. The fully
ballasted first production tow tractor shall be tested as follows to demonstrate compliance with
the turning radius specification:
a. Facility. Perform the test on a dry, level, paved area that is free from loose material and
is larger in all directions than three times the length of the vehicle being tested.
b. Equipment required.
1. A device suitable for measuring three times the length of the vehicle being tested with
an accuracy of at least ±1-inch.
2. Markers or marking device suitable for marking the pavement.
3. A plumb bob suitable for locating a point on the pavement directly below a fixed
point on the vehicle.
4. A test report notebook or similar record forms to be used as a test report work sheet
and incorporated into the documentation package.
c. Test Conditions.
1. The tow tractor shall be fully ballasted and in operational form.
2. The tow tractor steering system shall be fully operational, and the steering linkage
stops shall be adjusted to the manufacturer's specified production tolerance limits.
d. Test Procedure.
1. The vehicle shall be driven slowly in a full cramp circle (left or right) to establish a
steady state in the steering linkage.
2. Continue driving the slow full cramp circle.
3. At approximately three equidistant points (identified as A, B, and C) around the
circle, gently stop the vehicle using the service brakes.
4. At each stop, place a plumb bob against the outermost point of the vehicle and mark
the spot on the ground directly below where the plumb bob comes to rest.
5. Measure and record the straight line distances between each pair of points, i.e.,
Lengths AB, BC, and CA.
6. Calculate the wall-to-wall turning radius (R) as follows:
R = D / 2 where
(AB x BC x CA)
D=
and
2 x (S x (S - AB) x (S - BC) x (S - CA))
S = (AB + BC + CA) / 2
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