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|  MIL-B-62152A(AT)
(c)
Concealed marking, if required (see 3.1.1.1).
(d)
Manual transmission, if required (see 3.4.6.2).
(e)
Oil seals, if required (see 3.4.10).
(f)
Traction control, if required (see 3.4.10.1).
(g)
Disc type wheels, if required (se 3.4.11).
(h)
If a spare wheel assembly is not required (see 3.4.11.3).
(i)
If a spare tire is not required (see 3.4.11.4).
(j)
If tools are not required (see 3.4.18).
*
6.3 Performance prediction. Completed copies of SAE Truck Ability Prediction
Procedure form, and computation for low speed requirement for the vehicle furnished under
contract, should be submitted as specified in the contract. Unless other conditions are cited in the
contract, computations should be made for normal atmospheric pressure, normal ambient air
temperature, and in still, dry air. The factors to be used in predicting vehicle ability (see 3.3) are
established as follows for the corresponding SAE J688 Truck Ability Prediction Procedure
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. 2.080
Table
4
- Area factor. 0.197
Table
5
- Velocity factor. 432.0
Table
6
- Altitude factor. 1.00
Table
7
- Chassis friction horsepower. Use applicable power unit GVW
(to nearest, higher, 1000 pounds) and the engine rpm (to nearest
100 revolutions) which is required for 60 mph geared speed. For
GVW and engine speed beyond the range of this table, the
following formula shall be used:
FHP = 1 + (0.0000002 rpm) (GVW).
Table 8
- Grade factor. 0.62
Table 8A
- Correction factor. Not required.
Table 9
- Road factor. 0.0
6.4 Changes from previous issue. The margins of this specification are marked with
asterisks (*) to indicate where changes (addition, modifications, corrections, deletions) from the
previous issue were made. This was done as a convenience only and the Government assumes no
40
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