MIL-DTL-62049G
wheels and hubs, and examine the lubricant for evidence of water contamination and foreign
matter. Water exceeding 2 percent or entrance of any foreign matter shall be indications of
bearings seal failure.
4.5.4 Electrical.
4.5.4.1 Electrical circuits. To determine conformance to 3.3.2.1, test the electrical
circuits of the semitrailer as specified, with no discontinuity, or internal or external shorts
allowed. Examine 110/220 V ac components and circuits to determine conformance to specified
code. Measure the voltage output at the heater and air conditioner interface points to determine
conformance to 3.6.9.1 and 3.6.9.3.
4.5.4.2 Lighting system. To determine conformance to 3.3.2.2, operate all external and
internal lights, and examine them for functionability prior to start, and during, and at completion
of all road tests specified herein. Corrective action taken for deficiencies or failures noted in the
external or internal lighting systems shall include investigation and correction of the cause of
such deficiencies or failures.
4.5.4.2.1 LED blackout light test. To determine conformance to 3.3.2.3 and 3.3.2.4,
examine LED blackout lamp assemblies, performing all operational tests and examinations at the
place of manufacture at completion of the 50 mile control test, except the 400 foot altitude test
and the 700 nanometer energy emission test. The certificate of conformance from the
manufacturer of the LED blackout lights shall be backed by test data indicating that all tests were
performed and met. Proving ground tests shall include all tests, except the 400 foot altitude test.
Corrective action shall be as in 4.5.4.2.
4.5.5 Features. Conformance to 3.3.3 and 3.3.4 shall be determined by exercising the
semitrailer and by qualitative observation sufficient to demonstrate that specified characteristics
and features are present and functional.
4.5.6 Tires and tubes. To determine conformance to 3.3.5, examine the tires and tubes as
specified in table III and exercise the semitrailer to observe that the specified characteristics of
the tires and tubes are present and that they are functional.
4.5.7 Brake air lines. To determine conformance to 3.3.6, examine and test both brake
air lines (service and emergency) and fittings; and establish manufacturing procedures and/or
controls to assure brake line cleanliness, and that protective routing is accomplished on
semitrailers, and that the specified brake line test for loss not greater than 5 psi in 5 minutes, is
conducted and met prior to road testing. Corrective action for deficiencies found during
examination and test shall include determination of the cause and appropriate correction to avoid
recurrence.
4.5.8 Reliability. To determine conformance to 3.4, point estimate value equal to or
greater than 8000 miles shall be demonstrated during testing. Point estimate shall be computed
using the cumulative test mileage of all vehicles, divided by the cumulative number of
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