MIL-T-62735 Trucks And Truck Tractors: Modified Commercial, General Specification ForThis specification covers general requirements for the classes, models and types of modified commercial trucks indicated in the specification title above and in 1.2 below. This specification is intended only as a document to be referenced in detail specification sheets that must, as a minimum, cover detailed truck body requirements and specify the model and class required from table I.

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MIL-T-62735

4.3.2  Road test.  The vehicle, for rear wheel drive models and models built with front wheel drive while on the chassis manufacturer's production line, need not be road tested by the contractor.  The vehicle for models with front wheel drive qualifying under 3.5.23, shall be road tested without payload and with two different distributions of payload.

4.3.2.1  Front wheel drive coversion road test.  Payload shall be distributed first, so that the front axle is loaded to GAWR and the vehicle is loaded to specified GVW (and GCW) and second, with the rear axle loaded to GAWR and the vehicle loaded to specified GVW and GCW).

4.3.2.1.1  Road test conditions.  The road test for each of the three conditions shall be for not less than 48 km (30 miles) at speeds up to maximum geared speed.  The test shall be over highways and gravel roads and for not less than 8 km (5 miles) at speeds up to 24 km/h (15 mph) over cross country terrain with ground and grade requiring both front and rear wheel drive.

4.3.2.1.2  Brake application.  During the loaded and empty portions of the road test, the brakes shall be applied firmly, bringing the vehicle to a sudden stop no less than 5 times during each of the three portions of the road test.

4.3.2.2  Road test observations.  During the road test, the front and rear suspension and the drivetrain shall be periodically inspected for interference and contact with other vehicle components.  Abnormal contact of the drivetrain or suspension components with other components shall be cause for rejection.  Front spring bumpers making contact with frame stops except under the most extreme cross country conditions shall be cause for rejection.  Operational or mechanical failure or evidence of operation detrimental to any component shall be cause for rejection.  Rejection shall be for permanent deformation as well as breakage.

4.3.3  Air transportability verification.  When air transportability is specified, the vehicle shall be inspected to determine that it conforms to the contractor's air transportability drawings and data as submitted to the Government for transportability approval.  Acceptance shall be withheld until the contractor presents written verification that the data has been approved by the procuring activity.  As a minimum, the following angles, dimensions and descriptions shall be checked against the Government approved contractor's drawings and data:

(a)   Angle of approach

(b)   Ramp breakover angle

(c)   Angle of departure

(d)   Height, longitudinal location and identification of highest component on truck

(e)   Dimensions and locations of any significant projections on truck

(f)    Load on each axle (curb weight)

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