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MIL-S-25073A(USAF)
4.3.2 Sampling plans. Sample seats shall be selected at random from each
lot on same material order, in the quantities specified below, for
compliance with the tests in 4.5.
a.
Two seats from each lot of 200 or fraction thereof.
b.
Three seats from each lot of 500 or fraction thereof. above 200.
c. One seat from each additional 500 or fraction thereof, above 500.
4.3.3 Rejection and retest. Failure of any seat to pass the acceptance
tests shall be cause for rejection of the entire lot represented. If in the
opinion of the inspector, such failure is attributable to faulty workman-
ship or other defects not likely to occur throughout the lot, the con-
tractor may test three additional seats selected at random from the lot.
Failure of any one of these additional seats shall be cause for the final
rejection of the entire lot represented.
4.4 Test conditions. The test conditions are described under the
individual tests to which they apply.
4.5 Test methods.
4.5.1 Examination of product. Each seat shall be carefully examined to
determine conformance specification with respect to design,
standard parts, finish, adjustments, dimensions, workmanship, material,
weight, and marking.
4.5.2 Functional tests. The sample seat shall be mounted in a suitable
jig or fixture by utilizing the normal track tie down provisions. The
seat shall then be subjected to and be required to withstand without failure,
the ultimate loads specified in 3.5.3. These loads shall be applied to the
seat without cushions. The attitude of the seat during the test may be
changed to facilitate testing if the direction of the loads with respect to
the seat remains the same. The loads may be applied by means of hydraulic
or pneumatic press, jacks, shot bags, or any other suitable method. The
lap belt and shoulder harness mountings shall be loaded simultaneously to
the ultimate loads specified in 3.5.3. The lap belt attachments shall be
subjected to tests in which the loads are applied to a block or a frame
fitted within the seat and held in place by the lap belt attached to the
mountings. The load shall be applied to the shoulder harness take-up
reel by means of a shoulder harness or strap of equivalent dimensions to the
shoulder harness attached to the take-up cable terminal. The strap or
shoulder harness shall be carried up over the shoulder harness support, and
the loads applied as indicated in 3.5.3.
4.6 Environmental tests.
4.6.1 The following environmental tests shall be conducted in accordance
with the specified procedures of MIL-E-5272.
4.6.1.1 Humidity. The seat shall operate satisfactorily during and after
exposure to relative humidity of 100 percent, including conditions wherein
condensation takes place in the form of both water and frost. Humidity
test shall be conducted in accordance with Procedure I of MIL-E-5272.
9

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