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|  MIL-T-62021E(AT)
(w)
Bias ply tires, if required (see 3.4.10.1).
*
(x)
Low profile tires, if required (see 3.4.10.1).
(y)
Carrier for a spare wheel or rim and tire assembly if required (see 3.4.10.3).
(z)
Spare wheel or rim, if required (see 3.4.10.4).
(aa)
Mounted spare tire, if required (see 3.4.10.5).
(ab)
Trailer brake control system, if required (see 3.4.11.2).
(ac)
Brake control from a towing vehicle, if required (see 3.4.11.2.1).
(ad)
Tilt cab, if required (see 3.4.12).
(ae)
Individual adjustable driver's and passenger seats, if required (see 3.4.12).
*
(af)
Intermittent windshield wipers, if required (3.4.14).
(ag)
Tools, if required (see 3.4.16.1).
*
(ah)
Remote control curbside rearview mirrors, if required (see 3.4.20).
*
(ai)
Heated rearview mirrors, if required (see 3.4.20).
(aj)
An air horn, in addition; if required (see 3.4.21).
*
(ak)
AM/FM radio, if required (see 3.4.23).
(al)
Cooling system protection down to -54C (-65F), if required (see 3.4.24.1).
*
6.3 Performance prediction. SAE Truck Ability Prediction Procedure computations and
computations for low speed and maximum geared speed will be required by the contractor. The
SAE Work Sheet Item 1 should include vehicle model number and engine model number. 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 Tables:
Table 1
- Tire factor. This factor must relate to the size of the 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; for truck tractors use 0.225.
Table 5
- Velocity factor. 250.00
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
xtrapolated.
Table 8
- Grade Factor. 0.75.
Table 8A
- Correction Factor. Not required.
Table 9
- Road Factor. 0.0.
28
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