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|  MIL-T-62246B(AT)
(p)
Other type tires, if required (see 3.4.10.1).
(q)
Spare wheel or rim, if required (see 3.4.10.3).
(r)
Spare tire assembly, if required (see 3.4.10.4).
(s)
Air brakes, if required (see 3.4.11.2).
(t)
Trailer brake control system, if required (see 3.4.11.3).
(u)
Brake controls for use from a towing vehicle, if required (see 3.4.11.4).
(v)
Tilting hood and fender assembly, if required (see 3.4.12).
(w)
Tilt cab, if required (see 3.4.12).
(x)
Air ride driver's seat, if required (see 3.4.12).
(y)
Tilt cab windshield cleaning step and grab handle, if required (see 3.4.12).
(z)
Tools, if required (see 3.4.16.1).
(aa)
Air operated horn, in addition, if required (see 3.4.21).
6.3 Performance prediction. SAE Truck Ability Prediction Procedure computations and
computations for low speed and maximum geared speed will be required by the contract. The
SAE Work Sheet Item 1 should include vehicle model number, engine model number, and
vehicle type. Unless other conditions are cited in the contract, computations should be made for
normal atmospheric pressure, normal ambient air temperature, and still dry air. The factors to be
used in predicting truck ability (see 3.3.1.1) are established as follows for the corresponding
SAE Truck Ability Prediction Procedure Table:
Table 1
- Tire Factor. This factor must relate to the size of tires furnished by the
contractor in accordance with this specification.
Table 2 - Altitude Factor. 1.00
Table 3 - Rolling Factor. 1.613
Table 4 - Area Factor. 0.173
Table 5 - Velocity Factor. 250.0
Table 6 - Altitude Factor. 1.00
Table 7 - Chassis Friction Horsepower. Use applicable power unit GVW (to nearest,
higher, 1,000 pounds) and the engine rpm (to nearest l00 revolutions) which is
required for 50 mph geared speed. For GVW and engine speed beyond the
range of this table, factors shall be extrapolated.
Table 8 - Grade Factor. 0.75
Table 8A - Correction Factor. Not required
Table 9 - Road Factor. 0.0
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