MIL-DTL-62049G
chargeable failures of all vehicles. The reliability shall be demonstrated in accordance with the
operational profile during testing (see 4.5.3). For calculation of MMBF, a failure shall be
defined as a condition which:
a.
Prevents operations, or
b.
Reduces performance below essential levels, or
c.
Indicates to the crew that further operations would be unsafe, or
d.
Indicates to the crew that further operations might result in extensiveness damage to
the equipment.
Any of the four conditions which cannot be corrected by the crew in one hour using basic issue
items that are carried on the truck-tractor or the semitrailer constitutes a failure. Maintenance
and human induced failures are excluded.
4.5.8.1 Operational profile. The 6000 miles of testing plus the remaining terrain testing
with the required speeds and payload on each type of road and terrain shall be in accordance with
table V.
TABLE V. Operational profile.
Percentage of test Maximum speed
Minimum
Total test
Road/terrain
mileage
(mph) 1/
speed (mph)
distance
6-ton payload
allowed 2/
allowed 2/
Hard surface (paved)
2400 miles
40
55
45
road
Gravel and dirt
1620 miles
27
30
20
(secondary) road
Level cross-country
1500 miles
25
30
20
terrain 3/
Hilly cross-country
360 miles
6
30
20
terrain 4/
Belgian block
120 miles
2
20
15
Side slope,
200 feet
--
5
3
20 percent
Longitudinal slope,
200 feet
--
5
3
20 percent
1/ miles per hour (mph)
2/ Speed may vary between the maximum and minimum speeds allowed based on terrain and
environmental conditions, and may be determined safe by the operator of the prime mover.
3/ Per No. 1 Perryman Cross-Country Course (at Aberdeen Test Center (ATC), Aberdeen, MD)
4/ Per Churchville Course (at ATC, Aberdeen, MD)
4.5.8.2 Road and terrain course regulations. The semitrailer shall complete not less than
6000 miles of operation when loaded with payload of 12 000 pounds (lb) (approximately evenly
distributed, fore and aft, within 3 percent) without failure of: (a) components and subassemblies,
17
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business