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Angle of approach, ramp breakover, and departure |
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|  MIL-T-12407X(AT)
3.2.6 Ratings. Vehicle and component ratings shall be the manufacturer's published
ratings. Vehicle and component ratings shall not be raised to meet the requirements of this
specification. When published ratings are not available, verification of the ratings shall be
available to the engineering office of the procuring activity.
3.2.7 Standard frame and driveline. The chassis frame and driveline shall be the chassis
*
manufacturer's standard and shall not be spliced to extend the wheelbase.
3.2.8 Wheelbase. The wheelbase shall be not less than 123 inches.
3.2.9 Angle of approach, ramp breakover, and departure. The vehicle, loaded to the
required GVW, with bumpers and rear step (with step down if folding style), shall provide not less
than the following clearances, measured in accordance with SAE J689:
Approach angle
-20 degrees
Ramp breakover
-10 degrees
Departure angle
-10 degrees
3.2.10 Interchangeability The vehicle chassis, body, equipment, seats, and component
parts shall-be fabricated and assembled through the use of tooling which ensures production of
interchangeable parts and assemblies.
3.2.11 Strength. Materials, fabrication, and attachment of all vehicle equipment and
furnishings shall be adequate to withstand working stresses including dynamic loads encountered
in mobile operations and all normal usage.
3.2.12 Accessibility. The design of the vehicle and optional equipment shall permit access
for routine servicing and shall permit access for replacement and adjustment of component parts
and accessories with minimal disturbance of other components and systems.
3.2.13 Asbestos. Asbestos materials shall not be used in any form in any part of the
vehicle.
3.3 Performance. The vehicle shall meet the following performance requirements. For
4x4 model vehicles, performance requirements shall be met with front wheel drive disengaged
except that a vehicle equipped with interaxle compensating devices shall meet the performance
requirements with the front wheel drive engaged.
3.3.1 Speeds and gradeability. High and low speed requirements shall be met with the
vehicle loaded to the required GVW as specified in 3.2.5. The vehicle shall be capable of
maintaining a high speed of not less than 70 miles per hour (mph) on smooth, approximately level
road surfaces, with the engine operating within the recommended maximum revolutions per
minute (rpm).
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