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|  MIL-N-85005A(AS)
(a) The maintainability indices of Paragraphs
(6) General:
3.4.2 and 3.4.3 of AR10A shall be
considered in the design and the
following shall be the minimum require-
ments:
LRA ratio
.714
NA ratio of
.87 Does not include
BITE detected ambiguities with associated
failures
equipment.
FI ratio
As specified in AR10A.
Loading of constants or
scale factors into the Nav-
igation Computer and other
adjustments required by
associated equipment shall
not be included.
QRA ratio
.8
.85 for 1 SRA
SNA ratio
.9 for 2 SRA's
1.0 for 3 SRA's
SFI ratio
.95
(b) The requirements for test points specified
in Section 3.5 of AR-10A shall guide
the design of new items only as
necessary to meet the requirements of
Section 3.3.7.2 of this specification.
(c) Previously produced Items shall not
be required to meet any requirement
specified in AR-1OA.
Packaging Requirements - The equipment shall be packaged
3.3.7.4
in modular form so that, to the maximum extent practical, all subassemblies
shall be of the plug-in type and should be easily removable.
Protective Devices - Overload protection devices shall be
3.3.7.5
used. The NC and SDC shall be protected by single phase circuit breakers.
Circuit breaker reset mechanisms and fuses, when used, shall be accessible
from the exterior of the equipment.
Maintenance Module Accessibility - Maintenance module
3.3.7.6
arrangement will be such that access to each module does not require the
removal of adjacent modules or parts other than access panels.
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