MIL-DTL-8954C
4.3.1 Individual test. Each component shall be subjected to an examination of product test as described
under 4.4.
4.3.2
Sampling tests.
4.3.2.1 Sampling. One component shall be selected at random from each lot of 100 or fraction thereof
produced and subjected to the following tests as described under 4.4.
a. Base leakage
b. Dimensions
c. Static load
4.3.2.1.1 Lot. A lot shall consist of components manufactured under essentially the same conditions and
submitted for tests at substantially the same time.
4.4 Test methods.
4.4.1 Examination of product. Each component shall be examined to determine conformance to this
specification with respect to materials, workmanship, and marking.
4.4.2 Base leakage. All holes in the base except those required to accommodate the pressure gage and air inlet shall
be sealed. A blank cover conforming to MS26580 and matching gasket conforming to MS26577 shall be bolted to the top
flange of the base. Suitable fitting with a pressure gage shall be connected to the base. Air pressure of 15 ±2 psi shall be
applied to the assembly for 10 minutes. A high-foam detergent producing a low-surface tension shall be applied to all
surfaces, including welds and joints. Any leakage indicated by bubbles shall be cause for rejection.
4.4.3 Dimensions. Articles selected as specified in 4.3.2.1 shall be checked for compliance with the
dimensions of the applicable MS.
4.4.4 Static load. The base plate assembly or blank cover, as applicable, shall be mounted on a rectangular cross-
sectioned ring having an inside diameter of 8 inches and an outside diameter of not less than 12 inches. The ring shall be
not less than 2 inches thick. Six equally spaced holes matching those provided on the top mounting surface of the
MS24526-4 base shall be provided in the ring. The holes shall be of sufficient depth to accommodate .3750-16 UNC-2A
bolts when the base plate assembly or blank cover is mounted on the ring for test. A gasket conforming to MS26577-1
shall be installed between the base plate assembly or blank cover as applicable, and the mounting surface of the test ring.
Mounting bolts shall than be installed and drawn down as if the item was being installed on an MS24526-4 base. A load
of 100,000 pounds shall be applied at a rate of approximately 20,000 pounds per minute to the top of the test item through
a rubber or synthetic rubber block with a Shore A hardness of 60 +5. The block shall be 1-1/2 inches thick and at least 12
inches in diameter and centered on the test item. The rubber block shall be covered by a metal plate of sufficient
thickness that it will not be physically deformed during the test. The plate shall be at least 12 inches in diameter and shall
be centered on the ring and item being tested. Failure as evidenced by cracking or breaking of the test item before the
applied load reaches 100,000 pounds shall be cause for rejection without further testing. Otherwise, the base plate
assembly or blank cover, as applicable, shall be subjected to the leakage test in 4.4.2. A new gasket shall be installed
between the test item and base, and all open holes in the base plate cover shall be sealed when the leakage test is
conducted. Any leakage as indicated by bubbles between the base plate assembly or blank cover and the base shall be
cause for rejection of the test item.
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