MIL-S-6551A(USAF)
4.2 Acceptance tests. Acceptance tests shall consist of:
a. Individual test
b. Sampling plan and tests
4.2.1 Individual tests. Each seat shall be subjected to the following tests as described under 4 .4 "Test Methods" of this specification:
a. Examination of product b. Functional tests
4.2.2 Sampling plan and tests. Sample seats shall be selected at random from each lot on the same material order, in the· quantities specified below for compliance with 4. 4. 3.
a. Two seats from each lot of 400 or fraction thereof.
b. Three seats from each lot of 800 or fraction thereof, above 400.
800.
c. One seat from each additional 800 or fraction thereof, above
4.2.3 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 workmanship or other defects not likely to occur throughout the lot, the contractor 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.
4.3 Test conditions. The test conditions are described under the individual tests to which they apply.
4.4 Test methods.
4.4.1 Examination of product. Each seat shall be carefully examined to determine conformance to this specification with respect to design, standard parts, finish, adjustments, dimensions, workmanship, material, weight, and marking. Special attention shall be given to the ejection control mechanism.
4.4.2 Functional tests. The seat shall be mounted in a suitable jig or fixture and the complete operation of the seat mechanism shall be checked up to the actuation of the cartridge devices. The force required to actuate the ejection control shall be in accordance with 3.2.14.3. The amount of travel obtained at the seat catapult initiator, when the ejection control is
actuated, shall be as specified in 3.2.14.4.
4.4.3 Strength. Conformance to strength requirements shall be determined by testing the seat as specified in 3.3�3.l through 3.3.3.8.4, except that proof loads shall be used instead of ultimate loads. No part of the seat shall show a permanent set as a result of these tests.
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