MIL-T-62491C
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 Tables:
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, 454 kg (1,000 pounds)) and the engine rpm (to nearest 100 revolutions) which is required for 80 km/h
(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.
6.4 Change in classification. The initial issue of this document covered only hydraulic wreckers, as follows:
Previous (initial) class |
Current class, type I |
A |
10 |
B |
28 |
C |
32 |
D |
39.5 |
E |
50 |
Mechanical wreckers were formerly covered by specifications KKK-T-2107 through 2111, as follows:
Previous coverage, type V in Coverage in this document: KKK-T-2107, class D Type II, class 21, model 4x2
KKK-T-2108, class A Type II, class 24, model 4x2
KKK-T-2108, class C Type II, class 32, model 4x2
KKK-T-2109, class A Type II, class 34.5, model 6x4
KKK-T-2109, class C Type II, class 44.5, model 6x4
KKK-T-2110, class C Type II, class 24, model 4x4
KKK-T-2111, class A Type II, class 36, model 6x4
KKK-T-2111, class B Type II, class 44, model 6x6
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