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|  MIL-D-48437A(MU)
TABLE V
4.7.1 Data collection. - Data collected till consist of all equipment
malfunctions, number of hours completed when malfunction occurred, nature
and cause of malfunction, time required to correct malfunction, required
corrective action, item serial number and environmental exposure.
4.7.2 Failure definition. - A failure is defined as any malfunction
which renders the system inoperative or operative outside the limits of
this specification. In determination of chargeable reliability failures
the following clarification shall apply:
a. If upon failure analysis (to determine the cause of the mal-
function) an assignable cause (related to manufacturing process, procedure,
basic design weakness, etc.) is determined as the basis of the malfunction,
the malfunction will not be chargeable as a reliability failure. However,
correction to the manufacturing process or procedure (et al) shall be
accomplished.
b. If upon failure analysis no assignable cause is evident and
the malfunction is considered random in nature, the malfunction shall be
a "chargeable" reliability failure and as such must be considered in the
above demonstratio test criteria. The decisions as to chargeable reli-
ability failure must be co-ordinated with the procuring activity, Frank-
ford Arsenal Reliability and Maintainability Engineering Branch, SARFA-
QAF-R.
4.7.3 System interruption. - A system interruption is any system mal-
function for which the system is operable within the limits set forth in
this specification, but requires maintenance to correct the malfunction.
Although a system interruption does not penalize the reliability, it may
constitute a failure of some major subassembly or component for which sy-
stem acceptance cannot be made until that characteristic or component
which caused the system interruption has been screened.
4.8 Reliability Run-in. - Subsequent to the successful performance
requirements of this specification the display shall be subjected to 50
hours of Run-in time. The Run-in shall exclude any down-time necessary
for repairs. It shall include vibration, followed by at least four hours
at -4F and at least four hours at +125F.
4.8.1 Vibration Run-in. - The vibration test shall be performed as speci-
fied in MIL-STD-81O, Method 514.1, Procedure IX, Part I. Subsequent to
the vibration test, the Display shall not have been damaged or adversely
affected and shall meet the performance requirements of this specification.
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