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|  MIL-S-62469(AT)
6.6 Failure definition. Failure of the trailer is defined as inability to perform its specified
operational functions during emplacement or mobile events. Accordingly, semitrailer failure is a
function of the PATRIOT Air Defense System Guided Missile Transporter and Large Repair
Parts Transporter mission events; that is, air defense mission, march order, road march and
emplacement.
6.6.1 Failure classifications. Failure incidents shall be classified for reliability assessment
purposes as:
a. Chargeable failures (relevant).
(1) Mission essential.
(2) Non-mission essential.
6.6.2 Scoring criteria.
a.
Chargeable failures (relevant).
(1) Failures from workmanship deficiencies.
(2) Failures during maintenance action not induced by maintenance action.
(3) Failures which require component replacement or adjustment at other than
prescribed intervals.
(4) Failures caused by human factors design.
(5) All independent chargeable simultaneous failures.
(6) All trailer incidents which would result in the inability to complete air defense
mission events, even though there is no evidence of hardware failure, shall be
scored.
(7) Trailer failures which are functionally redundant or do not singularly prohibit
completion of air defense mission events, that is, relevant (non-mission
essential), shall be scored in determining the MTBF of the trailer.
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