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|  MIL-L-48407B(MU)
NOTE: During continuous mode operation, the trainer shall be "ON"
for 50 minutes and "OFF" for ten minutes each hour. The
total "ON" time shall be accumulated to satisfy the operating
hours as identified above.
TABLE V
RELIABILITY FAILURES
CONTINUOUS
FLASH
MODE HOURS
MODE FLASHES
ACCEPT NO. REJECT NO.
MINIMUM
MINIMUM
7
0
265,248
185
7
1
837,020
312
7
1,145,402
2
426
7
1,437,751
3
535
7
1,720,201
4
640
7
1,995,872
5
742
7
2,266,486
6
843
4.6.2.1 Data collection. - Data collected will consist of all equip-
ment malfunctions, number of hours and lasings completed when malfunction
occurred, nature and cause of malfunction, time required to correct mal-
function, required corrective action, item serial number and environmental
exposure.
4.6.2.2 Failure definition. - A failure is defined as any malfunction
which renders the laser trainer- 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) as 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
the 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 "changeable" reliability failure and as such must be considered in the
above demonstration test criteria. The decisions as to chargeable relia-
bility failure must be coordinated with the procuring activity, Frankford
Arsenal Reliability and Maintainability Engineering Branch SARFA, Q4100.
4.6.2.3 System interruption.- A system interruption is any system
malfunction for which the laser trainer is operable within the limits set
forth in their specification, but requires maintenance to correct the mal-
function. Although a system interruption does not penalize the reliability,
it may constitute a failure of some major subassembly or component for
which system acceptance cannot be made until that characteristic or com-
ponent which caused the system interruption has been screened. Subsequent
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