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|  MIL-S-18471G(AS)
3.4.1.1 Critical components analyses. The contractors shall conduct a worst
case type stress analysis, a worst case type tolerance analysis, and an
environmental study of those critical parts, the failure of which will
significantly affect the ability of the escape system to perform its overall
function or adversely impact safety considerations (see 6.2.2). Critical
parts shall include those parts identified as such through experience,
reliability analysis, failure mode and effects analysis, or through a single
point failure analysis.
3.4.1.1.1 Stress analysis. The critical components stress analysis shall
be conducted in accordance with NAVAIR 01-1A-32 (see 6.2.2).
3.4.1.1.2 Tolerance analysis. As a minimum, the critical components
tolerance analysis shall include thorough evaluations of the following, as
applicable (see 6.2.2):
a.
Tolerance buildup.
b.
Shaft and bore eccentricities (i.e. run-out).
c.
Concentricity deviations.
Centrality deviations.
d.
e.
Straightness (taper) deviations
Perpendicularity deviations.
f.
3.4.1.1.3 Environmental study. The environmental study of the critical
components shall be conducted in accordance with MIL-STD-2067 (see 6.2.2).
3.4.2 Maintainability. The contractor shall establish, implement, and `--'
document a system maintainability program in accordance with and embodying the
program elements defined in MIL-STD-2067 (see 6.2.2). The general guidelines
specified in MIL-STD-1472 shall be used for designing for maintainability
ease.
3.4.2.1 Cycle life. The number of cycles required for achieving
one installed cycle life shall be calculated as follows:
Gross cycles - (cycles/flight) x (20 flights/month) x
a.
(months/installed life of the component) x (1.25 safety
factor).
Cycle life - gross cycles rounded upward- to next full 1000
b.
cycles.
Cycles per flight include allowances for cycling during preflight preparation,
all phases of flight, post-flight operations, and periodic maintenance and
inspections performed within the aircrewmember station.
3.4.3 System safety. The contractor shall conduct a system safety program
in accordance with MIL-STD-882 (see 6.2.2). The hazard severity classification
shall define any hazard identified as degrading the escape system performance
envelope (see 3.3.2) as a Category I hazard.
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