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MIL-W-85057 (AS)
3.3.2.1 Operational Stability.  The equipment shall operate with
satisfactory performance, continuously or intermittently for a period
of 1800 hours without the necessity for readjustment of any controls which
are inaccessible to the operator during normal use.
3.3.2.2  Operating Life.  The equipment shall have a total operating
life of 10,000 hours with reasonable servicing and replacement of parts.
3.3.2.3 Reliability in Mean Time Between Failure (MTBF).  The equipment
Including any Built-In-Test provisions, shall have a speclfled MTBF of 1800
hours when tested and accepted as outlined under the requirements of 4.3.2.
The minimum acceptable  MTBF shall be 900 hours.
3.3.2.4 Calendar Life Limit.. The contractor shall identify all
items that change significantly with age (have a calendar life limit
that would fall within a 10-year period) and whose change would degrade
the reliability of the equipment.  This effort shall be coordinated with
the limited life/age environment control requirement as specified in the
contractor's quality program.
3.3.2.5 Failure Classification.  Classification of failures shall
be in accordance with MIL-STD-781 and MIL-STD-2074.
3.3.2.5.1 Failure Definition.
A failure is defined as follows:
a.
Failure to provide the performance specified in 3.4.
Any unplanned maintenance, adjustment, or alignment
b.
which is inaccessible to the operator.
c. Excessive wear or damage of mechanical components in
accordance with the contract requirements.
3.3.2.5.2 Failure Reporting.  The contractor's failure reporting,
analysis and corrective action system shall apply to failures l xperienced
on each subassembly and end-item during tests performed in accordance with
approved test procedures.  Failure analysis and corrective actions shall be
included in the contractor's failure reports and shall be submitted to the
procuring activity in accordance with the contract requirements.
3.3.2.5.3 Failure Analysis.  The contractor shall perform failure
analysis on all failures reported to the procuring activity to the in-depth
level required to define the failure mechanism and to develop corrective
actions to limit their recurrence.  In general, the analysis shall include
a physics of failure analysiS on electrical parts.  The analysis of parts
shall typically include electrical failure verification, dissection,
microphotography, and adequate chemical and metallurgical analysis to
define the failure mechanism (e.g., most fundamental cause; metallization
corrosion).  Records of failure analysis, including causes and effects,
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