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| MIL-S-26688(USAF)
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.
4.4.2 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 required to,
withstand without failure the following loads. The attitude of the
seat during the test may be changed to facilitate testing provided
the direction of the loads with respect to the seat remains the
same. Loads may be applied by means of hydraulic or pneumatic
presses, jacks, shot bags, or any other suitable method.
4.4.2.1 SEAT BACK.- A load of 4000 pounds ultimate, 2665 pounds
proof shall be applied simultaneously to each of' the backs acting
rearward in a horizontal plane under three separate conditions as
follows: directly aft, 20 degrees to the right, and 20 degrees to
the left. The loads shall be distributed over the seat backs and
applied at the point shown in figure 3. The seat back shall be
adjusted to the maximum upright position shown in figure 3 and
also at one intermediate adjustment position for these tests~
4.4.2.2 SEAT BOTTOM. - A load of 4000 pounds ultimate, 2665
pounds proof shall be applied simultaneously to each seat bottom.
The load shall be equally distributed over the seat bottom.
4.4.2.3 ARM RESTS. - A side load of 200 pounds ultimate, 135
pounds proof shall be applied both outword and inward perpendicular
to each arm rest in a horizontal plane. The above loads shall be
applied at the center of each arm rest. It is not required that
these loads be applied simultaneously on all arm rests.
4.4.2.4 FOOT RESTS.- A down load of 250 pounds ultimate, 170
pounds proof shall be applied to each foot rest in each adjustment
position.
4.4.2.5 SAFETY BELT FITTINGS. - A load of 1000 poundsultimate,
666 pounds proof shall be applied simultananecusly to each of the
safety belt fittings. These loads shall be applied upward and
forward in a single plane which makes an angle of 70 degrees with
the horizontal. This correeponds to a tension load of 2000 pounds
ultimate or 1332 pounds proof acting on each belt.
4.4.3 CONFORMANCE TO DRAWINCS.- Each sample seat shall be
inspected for strict conformance to the pertinent drawings and
specifications.
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