MIL-DTL-14055G
4.5.3.1 Reduced test frequencies periodic tests. If there have been no reported failures after two
consecutive intervals, then periodic testing, with the written approval of the Qualifying Activity, may be
performed at 24 month intervals. If there are no reported failures after the next 24 month interval, then
periodic testing, with the written approval of the Qualifying Activity, can be done at 36 month intervals. If
the design, material, construction, or processing of the part are changed, or if there are any quality
problems or failures, the Qualifying Activity may require resumption of the original test frequency.
4.6 Manufacturing production.
4.6.1 Change to manufacturing process, materials or equipment. The manufacturer shall notify the
qualifying activity, in writing, of any changes in the manufacturing process, materials, or equipment used
to manufacture a qualified product list (QPL) product. Subsequently, the qualifying activity shall notify the
manufacturer, in writing, if a full re-qualification, partial re-qualification, or no additional testing is required
as a result of these changes.
4.6.2 No production during reporting period (12 months). When no production occurs during the
reporting period, a report shall be submitted to the qualifying activity certifying that the manufacturer still
has the capability and facilities necessary to produce the QPL product.
4.7 Methods of inspection.
4.7.1 Test methods. The following tests and test methods assure wheel cylinder cups, master cylinder
primary cups, and master cylinder secondary cups integrity within typical operating conditions and
applications. Alternate test methods are allowed with prior approval by the qualifying activity. The test
methods described herein are the preferred methods and take precedence when alternate test methods
give differing or conflicting results.
4.7.2 Durometer hardness. To determine conformance to 3.4.1, the durometer hardness shall be
determined in accordance with ASTM D2240 or Method 361 of FED-STD-791, and using a type A Shore
durometer. The same operator shall make all hardness determinations for any one test.
4.7.2.1 Apparatus. The apparatus shall incorporate the use of a rubber anvil having a durometer
hardness in the same range as the cup being tested and of such shape as to mate with the inner contour
of the cup, and metal fixture to hold the anvil firmly and provide a level seat for the instrument.
4.7.3 Accelerated aging. The cups shall be subjected to the accelerated aging test specified in
ASTM D573 with the following exceptions:
a. Two cups shall be rinsed in isopropyl alcohol or ethyl alcohol and wiped dry with a lint-free cloth to
remove dirt and packing debris. The cups shall not remain in the alcohol for more than 30 seconds.
b. The cups shall be tested for durometer hardness as specified in 4.7.2.
c. The cups shall be aged at a temperature of 212°F ± 2°F (100°C ± 1.5°C) for 70 hours.
d. At the end of the 70-hour period, the cups shall be removed from the oven, placed on a table with a
wooden top and allowed to cool for 30 minutes to room temperature. The cups shall then be
retested for durometer hardness to determine their conformance to 3.4.2.
4.7.4 Low temperature test.
4.7.4.1 Bendability. Cups when subjected to bendability testing shall meet the requirements in 3.4.3.1.
The following details and conditions shall apply:
a. One cylinder cup shall be used as a test specimen.
b. The specimen shall be rinsed in isopropyl alcohol or ethyl alcohol, and wiped dry with a
lint-free cloth.
c. The cylinder cup shall not remain in the alcohol for more than 30 seconds.
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