MIL-DTL-27443F (USAF)
4.4.4.1 Rejection and retest. When a pallet fails to meet the requirements of this specification, pallets
to be delivered pursuant to the contract may not be accepted until the cause of the failure is determined,
corrective action is taken by the contractor, and the components that failed is successfully retested to
assure compliance with this specification. Tests not involving the failed component may be continued
pending the investigation of a test failure.
4.5 Test Methods.
4.5.1 Examination of product. The pallet shall be inspected to determine compliance with all
requirements specified herein with respect to materials, dimensions, workmanship, and marking. For
the first article and random sample pallets this examination shall be accomplished by use of a checklist
which lists each requirement not validated by a test and the results of the examination.
4.5.2 Tap test. Each pallet shall be inspected for continuity of bond (see 3.4.1), top and bottom
surface, by tapping the bonded area with a small metal or plastic hammer. The surface area of each
skin on the Type I pallet shall be divided into 72 equally sized quadrants. The surface area of each skin
on the Type II pallet shall be divided into 32 equally sized quadrants. Each quadrant shall be tapped
not less than one time. Any void area or blister, which is evidenced by a comparatively dull tapping
sound, shall be cause for rejection of the pallet. The metal-to-metal bond between the rail and the top
and bottom skin shall be tap tested continually around their entirety for bond. Special attention shall be
given to the corners of the pallet for continuity of bond. No delamination is allowed.
4.5.3 Tie down ring tests.
4.5.3.1 Ring location and movement test. Compliance with the ring location and free movement
requirements (see 3.4.2.1) shall be demonstrated for each ring.
4.5.3.2 Ring load test one. Two tie down rings, one located at the pallet corner and the other located
midway on the long side, shall be subjected to loading tests. In a plane that intersects the attachment
point and is perpendicular to the pallet surface and edge, the ring shall be sequentially loaded to 7,500
pounds along lines that form 30o, 45o, 90o, 135o, and 180° with the upper pallet surface (see 3.4.2.2).
4.5.3.3 Ring load test two. In a vertical plane that intersects the attachment point and is parallel to the
pallet edge, a 7,500-pound load shall be applied sequentially in two directions parallel to the upper
pallet surface and at 45o and 135o angles with this surface (see 3.4.2.3).
4.5.3.4 Ring load test three. The pallet shall be placed in a horizontal plane and two adjacent corner
rings pulled simultaneously and then two center rings pulled simultaneously. Evidence of permanent
deformation to the pallet shall be criteria for rejection. The load during each test shall be applied for not
less than 3 times each (see 3.4.2.4).
4.5.4 Static load test. While supported by four rows of conveyors as specified (see 3.4.5.1), parallel
to the shortest side, the pallet shall be loaded with a static load (see 6.3.2). The load shall remain on the
pallet for 40 hour. Permanent deformation as a result of this test shall be cause for rejection (see 3.4.3).
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