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|  MIL-G-85103B(AS)
3.2.2.4 Center of gravity. The gun system, when installed on the aircraft,
shall make minimum excursions from the aircraft baseline composite center of
gravities.
3.2.2.5 Ammunition capacity. The gun system shall have the capacity to
contain a minimum of 300 rounds, which is defined as a complement.
3.2.3 Reliability. The gun system, when installed on the AV-8 aircraft$
shall provide a minimum reliability, at a confidence level of 90 percent, of 0.95
probability of firing a 1-second burst of ammunition at any given firing sequency
within the limitations specified herein, without a stoppage as defined in 6.3.3.
Failures which have been corrected by test, analyze and fix procedures, subject
to government approval, may be eliminated from system reliability calculations.
The contractor shall provide objective evidence that the corrective action is
effective. Failures which have-been eliminated in this manner shall be rein-
stated in the analysis if a failure in the same mode reappears in subsequent
tests. When specified in the contract or purchase order, the reliability program
plan for monitoring, testing, demonstration, and reports shall be in accordance
with MIL-STD-785 (see 6.2).
3.2.3.1 Barrel durability. The gun barrels shall have a design requirement
of 3,750 rounds per gun barrel when the gun is fired in accordance with the burst
firing schedule-of 3.2.1.5 when firing at a rate specified in 3.2.1.3, and when
firing ammunition with any one type of rotating band. Barrel life is defined in
6.3.5.
3.2.4 Maintainability. The gun system shall be maintained at three levels
of maintenance: O (Organizational), I (Intermediate), and D (Depot). Total
maintenance shall be performed within these levels. Flight line maintenance
shall be performed by O level. Shop maintenance shall be performed by I level.
Rework shall be performed by D level. Maintenance allocation shall be at the
level consistent with the shipboard environment. The design shall require the
least human skills and board environment. The design shall require the least-
human skills and minimum variety and complexity of tools, utilities, and eqUip
utent to perform maintenance at the allocated maintenance levels. The following
design requirements shall be incorporated into the gun subsystem:
a.
The gun shall incorporate quick change barrels.
The gun sybsystem shall provide ready accessibility and quick
b.
removal/installation of major components.
Major components, disassembly, and assembly shall be accomplished with-
c.
out special tools or fixtures other than a handling fixture at I level.
d.
Major components shall be interchangeable without requiring calibration
or adjustment at time of replacement.
e.
Each major component shall be capable of being restored to serviceable
condition without use of system integration tests.
Major components requiring timing, when attached to other major
f.
components, will have timing devices and timing marks readily accessible
for activation and visual contact.
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