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| MIL-D-23222A(AS)
3.7.6
(Cont)
with design loads or stress for each condition selected in the Flight
Loading Spectrum, and for other conditions which have been selected for
fatigue analysis or tests of specific components. Prior to Phase I -
NPE, sufficient data shall have been obtained to show that stress levels
in critical components are acceptable levels with regard to structural
fatigue. Instrumentation shall be sufficient to determine if resonances
in critical components at frequencies corresponding to primary exciting
forces are present. In addition, not necessarily concurrent with the
above but not later than the start of INSURV Acceptance Trials, at least
25 hours of additional flight stress data from the performance of
Simlated operational mission profiles shall be obtained. These data
shall form a broader basis for re-assessment of preliminary fatigue
life estimates and provide a source for periodic re-evaluation of
component fatigue lives as a function of changes in mission serverity
which may develop with operational experience.
FLIGHT ENDURANCE TESTS. - A minimum Of 250 hours
3.7.7
of simulated mission profile and training flights
in a single helicopter configured in accordance with 3.1.3, shall be
performed. All equipment that will normally be operating during the
helicopter's missions shall be operating during these tests except
that scheduled flights need not be delayed because of the non-availa-
bility of equipment as approved by the test authority.
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