MIL-DTL-62049G
of ASTM D522, and followed by the Accelerated Corrosion Test of GM 9540P Method B,
120 cycles.
3.2.3 Ozone resistance. When specified (see 6.2), rubber components shall be ozone
resistant, as specified in applicable specifications or drawings (see 4.5.1).
3.2.4 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent
possible, provided that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs.
3.3 Construction. The semitrailer shall be fabricated and assembled in accordance with
applicable drawings and specifications specified herein and as supplemented by contractor
processing to assure delivery of a semitrailer in full compliance with the performance
requirements noted herein. If more than one unit of a particular component is used on the
semitrailer, the components used shall be identical in make, material, and quality. Riveting and
welding practices shall be the same on each semitrailer (see 4.5.1).
3.3.1 Wheel bearing seals. When fording or operating in mud, sand, or snow, seals shall
prevent the entrance of foreign matter into the bearings. Bearing seals shall prevent leakage of
lubricants from the bearings. Water contamination of wheel bearing lubricant after fording
operations, shall be not more than 2 percent by volume (see 4.5.2 and 4.5.3).
3.3.2 Electrical.
3.3.2.1 Electrical circuits. Electrical circuits shall maintain continuity from end to end
without evidence of internal or external shorts during all semitrailer operating conditions.
All 120 volt (V), 60 Hertz (Hz), single-phase and 220 V, 60 Hz, 3-phase alternating current (ac)
electrical system components, installation, and workmanship shall comply with the NFPA
National Electric Code (see 4.5.2 and 4.5.4.1).
3.3.2.2 Lighting system. The lighting system shall function under all semitrailer
operating conditions at the voltages listed in table II. All electrical contacts and connections
shall maintain positive contact and exhibit continuity from end to end of each circuit (see 4.5.2
and 4.5.4.2).
3.3.2.3 Light emitting diode (LED) blackout light. A blackout light shall be a 24 V
(nominal) lamp assembly (see 12258212) including one yellow solid-state lamp in the center and
a pair of red solid-state lamps on each side of the center lamp. The four red lamps shall appear
as individual lights from a 60-foot distance. From a 60- to 120-foot distance, the four red lights
shall converge into two points of light. Lights shall be visible from a 1000-foot distance, plus or
minus (±) 200 feet. When the semitrailer is on a 20-percent downgrade, no light shall be visible
from an altitude greater than 400 feet (see 4.5.2 and 4.5.4.2.1).
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