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|  MIL-T-62531(AT)
APPENDIX A
3.7.9 Ramp angle. The vehicle (without front mounted winch) and with rated payload shall
be capable of ascending, and advancing over the crest and descending a ______ degree ramp
surface connecting two horizontal surfaces (upper and lower) without any part of the vehicle,
except the tires, touching the ground.
Rationale
To ensure user mission requirements for off road performance the vehicles shall have the
ability to climb over and descend earth mounds, ditches, rough terrain, and also loading ramps
associated with the transportation of the vehicle by land, air or sea.
Guidance
Vehicle design must consider user requirements and incorporate the ramp angle into the
vehicle construction.
Lessons Learned
4.7.9 Ramp negotiation. To determine conformance to 3.7.9, the vehicle shall ascend,
advance over the crest and descend a ______ degree ramp surface without any part of the
vehicle, except the tires, touching the ground.
Verification Rationale
The ramp angle capability must be verified by operating the vehicle with the rated payload
over a prepared ramp corresponding to the angle of incline desired. The vehicle shall negotiate
the ramp while ascending or descending without any part of the vehicle contacting the ground,
except for the tires.
Verification Guidance
Insert the ramp angle required in the blank space.
Verification Lessons Learned
3.8 Environmental operation. The vehicle shall operate in an ambient air temperature of
49C to minus 32C (1.2 to 1.8 m above ground). With special equipment installed, vehicle shall
operate in an ambient air temperature of minus 32C to minus 46C (1.2 to 1.8 m above ground)
to minus 54C (ground surface temperature). The complete vehicle when in storage shall
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