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MIL-S-85510(AS)
Additionally, for both the static and dynamic tests, attachments shall be distorted
per 3.3.3.1 prior to load application. The seat shall then be subjected to, and
satisfactorily withstand the loads specified in 4.6.2.1 and 4.6.2.2 while maintain-
ing the aforementioned seat-to-aircraft attachment distortion. The supplier may
substitute the additional dynamic test series described in figure 18 for the static
tests (number 2, 4, 5 and 6) described in table I with prior approval of the Govern-
ment,  However, under no circumstances are test numbers 1 and 3 of table I to be
omitted from the first article inspection series.
4.6.2.1 Static tests. The occupant restraint shall be tested with rest of
the seat during the static tests specified in table I. In addition, the lap belt
and shoulder harness shall be statically tested separately to determine compliance
with table 11, thereby insuring that all components possess the required elongation
and strength margin.  The static test loads shall be applied through a body block
which is contoured as shown in figure 14. The body block shall include represen-
tations of the neck, the shoulders, and the upper legs. (Articulation of the upper
legs has been found to be necessary in order to relieve interference problems
resulting from the application of the required loads through a rigid structure to a
stroking seat system.)  The loads shall be applied while the load-deformation
performance of the seat is recorded. Lateral and longitudinal deflections shall be
measured from the seat pan (see figures 11 and 12). Vertical deflections shall be
measured from the occupant center of gravity. Total static test load to be applied,
for all directions, shall be determined by multiplying the required design load
factor specified in table I by the sum of the effective occupant and seat weights.
The contractor shall prepare and make available to the acquiring activity appropriate
test plans and test reports in accordance with the requirements of 4.1.1 arid 4.1.2
and the CDRL, DD Form 1423 (see 6.2.2).
4.6.2.2 Dynamic tests.  Dynamic first article tests of the seat shall be con-
ducted to the conditions specified in figure 3 and the seat shall evidence no loss
of structural integrity.  The seat shall retain the dummy occupant within the
confines of the safety harness and shall evidence no loss of structural integrity.
Any failure of a restraint system component or of a primary load-carrying member of
the seat shall be unacceptable.  A primary load-carrying structural member is
defined as a nonredundant member that if failed would allow uncontrolled motion of
the seat and produce injurious secondary impact hazard to develop.
The energy absorption mechanism shall limit the acceleration measured on the seat
pan or in the dummy to a value which stays within the acceptable pulse duration of
figure 2.
A 50th-percentile anthropomorphic dummy complying with the Code of Federal Regu-
lations, Title 49, Part 572, specification for dummies, should be used to simulate
the seat-system occupant for test 1.  A 95th-percentile anthropomorphic dummy simu-
lating as closely as possible the features of the 50th-percentile dummy described
above should be used to simulate the seat-system occupant for test 2.  Refer to
table IV for the appropriate occupant weight parameters representing the 95th and
50th-percentile occupants, respectively.
The contractor shall prepare and make available to the acquiring activity a dynamic
test plan and test report in accordance with the requirements of 4.1.1 and 4.1.2
and the CDRL, DD Form 1423 (see 6.2.2).
16

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