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Quality Assurance Provisions
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Seats, Helicopter Cabin, Crashworthy, General Specification For
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Methods of examination and test.



MIL-S-8551O(AS)
4.4.1 Test articles. The contractor shall take precautions to ensure that the
test articles receive no special care and, accordingly, are representative of arti-
cles which will be produced by the established production techniques, processes and
procedures.
4.4.2 Test article reuse. No seat system, subsystem, or components thereof, may
be reused in testing without the prior concurrence of the Government acquiring
activity.  If the contractor has reason to believe that the test articles might be
reused successfully, the components shall be identified to the acquiring activity
with an explanation describing why the contractor considers reuse feasible. The
contractor shall bear full responsibility for any failure resulting from reuse of
components or subsystem.
4.5  Quality conformance inspection.
Quality conformance examinations and tests
shall consist of the following:
a. Visual examination.
b.
Component sampling of energy absorbers.
4.5.1 Visual examination.  Sampling shall be in accordance with MIL-STD-105,
inspection level II for the critical defects listed in table 111, and inspection
level I for the minor defects.  The acceptable quality levels are 1.5 and 2.5
percent defective, respectively.
4,5.2 Component sampling of energy absorbers. Energy absorbers (load limiters)
of each type used on the seat system in the quantities specified below shall be
randomly selected and subjected to a static load-deflection test intended to verify
functional force-deflection profile and to demonstrate compliance of the devices to
the specified limit-load tolerance range of 10 percent of the design limit-load
value.
Five (5) energy absorbers (load limiters) of each type from each
a.
lot of 200 or fraction thereof.
b. Ten (10) energy absorbers (load limiters) of each type from each
lot of 500 or fraction thereof above 200.
Ten (10) energy absorbers (load limiters) of each type from each
c.
additional lot of 500 or fraction thereof above 500.
The rejection rate for each of the above sampling conditions (a, b, c) shall be zero
failures.  These units shall have been destructively tested and therefore, shall not
be released for service use.
4.5.3 Accuracy of test apparatus. The accuracy of instruments and test equip-
ment used to control or monitor the test parameters, whether located at a Govern-
s
ment testing laboratory or at the contractor s plant, shall be verified
(at least every 12 months, preferably once every 6 months, unless contractor pro-
cedures prepared to satisfy the requirements of MIL-C-45662 for calibration cycle of
specific instruments specify otherwise) to the satisfaction of the acquiring activity.
All instruments and test equipment used in conducting the tests specified herein
shall:
14

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