MIL-DTL-62164E(AT)
3.5.5 Turning ability. The semitrailer, when coupled to the prime mover operating in its
minimum turning circle (90 ft diameter wall to wall in a 180 turn), shall follow without
cramping, without damage to the semitrailer or prime mover, and without interference between
the semitrailer and the prime mover (see 4.5.3.7).
3.5.6 Trailing ability. When coupled to any prime mover the semitrailer shall trail in a
straight line (see 4.5.3.8).
3.5.7 Fording ability. The vehicle shall ford water up to 48 in. for a period of 15 minutes
without special preparation, and shall meet the requirements of 3.3.3.4 and 3.3.3.7 without the
entrance of water that would prevent proper function of the brake system (see 4.5.3.9).
3.5.8 Reliability. The M747 mission mean miles between failure (MMBF) shall not be
less than 9200 miles during the first 20 000 miles of 45% hard-surface roads, 50% secondary
roads and 5% cross-country operation. A failure is defined as an event that creates the following
conditions:
a.
Prevents operation, 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 extensive damage to
the equipment.
Any of the above four conditions which cannot be corrected by the crew in 1 hour, using the
tools and parts normally carried on the vehicle constitutes a failure. Maintenance and human
induced failures are excluded (see 4.5.3.10).
3.5.9 Maintainability (see 4.5.3.11).
a. Total maintenance excluding driver/crew checks and services shall not exceed
177 manhours during the first 20 000 miles of operation as specified. This
equates to a maintenance ratio (MR) of 0.05 at 13 operating miles equivalent to 1
operational hour.
b. The scheduled maintenance intervals shall be 6 months or 6000 miles of operation
whichever comes first.
c. Maximum time to repair (to include diagnosis, repair and verification) utilizing
personnel normally employed at:
(1) Organization maintenance shall not exceed 5 hours 95% of the time.
(2) Direct support maintenance shall not exceed 16 hours 95% of the time.
3.6 Painting. Unless otherwise specified (see 6.2), the trailer shall be cleaned, treated,
and painted in accordance with MIL-DTL-53072 with the topcoat color to be determined by the
program office (see 4.5.2).
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