MIL-STD-2193C(SH)
5.3.4.3 High temperature. The component shall be maintained at 80 °C (176 °F) for a length of time sufficient to allow all parts to attain this temperature. The component shall then be actuated at least two times. In the case of pressure actuation or regulation, the variation of actuating forces or regulation shall not exceed that specified in the applicable component specification. The leakage test (see 5.3.3.5.2) shall be performed after each actuation and the leakage requirements of the applicable component specification shall be met.
5.3.5 Endurance. Components shall be designed for a 30-year service life which may be equated to 150,000 hours of operation. Compliance with the service life requirement shall be demonstrated for components not subject to qualification or first article testing under a military specification. Unless otherwise specified in the acquisition specification, this shall be done either by a first article cyclic operation endurance test, or based on data representing at least 5 years of continuous operating experience. Unless otherwise specified (see 6.2), the endurance test can be limited to 2,000,000 cycles or 500 hours operating time for continuously operating components and other components where testing for the number of cycles equivalent to 30 years operation is impractical. During the endurance test, individual parts carried on board for logistic support, such as seals, may be replaced at intervals equivalent to not less than 20,000 hours or 200,000 cycles of operation, whichever is less. Disposable type filter elements in components may be replaced when required. At the conclusion of the endurance test, the component shall operate satisfactorily and meet endurance performance requirements specified in the applicable component specification. If specific endurance requirements are not specified in the component specification, then an internal leakage test shall be conducted and the leakage shall not exceed 300 percent of that specified for a new component.
5.3.6 Fatigue. Valves, pressure containers, and similar components (except hose assemblies) which have an expected service life of one million or more pressure cycles, with a magnitude in excess of 50 percent of their rated operating pressure, shall be fatigue tested to 90 percent assurance and 90 percent confidence levels in accordance with NFPA T2.6.1.
5.3.7 Noise. When tested in accordance with the Shipboard Equipment Noise requirement section of
MIL-STD-1474 and MIL-STD-740-2, the component shall perform in accordance with the requirements specified in the applicable component specification. The noise test shall be either airborne or structureborne as specified in the applicable component specification. The noise test shall be performed after all other tests have been completed,
with the exception of the burst pressure test.
5.3.8 Vibration. Components shall operate when subjected to Type I (environmental vibration) vibration tests in accordance with MIL-STD-167-1. In addition, rotating machinery such as pumps and motors shall meet the Type II (internally excited vibration) requirements of MIL-STD-167-1. For Type I tests, the component shall be tested in each of three mutually perpendicular axes. However, if a component is symmetrical about a principal axis, vibration testing need only be accomplished along two orthogonal axes, one of which shall be the principal axis of symmetry. The vibration test shall be run early in the component test program or various tests repeated after vibration testing to assure that vibration has not had an adverse effect on performance. Any of the following conditions resulting from vibration are considered unacceptable:
a. Damage to parts.
b. Loosening of parts.
c. Degradation of operational performance (including leakage) below specification requirements.
5.3.9 Reliability. When specified in the component specification, each component shall meet a specified quantitative reliability requirement in terms of Mean-Time-Between Failure (MTBF) or its equivalent. Reliability tests shall demonstrate conformance with the reliability requirements and confidence factors as specified in the applicable component specification for critical components.
5.3.10 Maintainability. The component shall demonstrate the ability to meet the allowed time for maintenance actions identified in the component specification. The elapsed time and man-hours required to replace each of the on board repair parts and the elapsed time and man-hours to perform each proposed preventive maintenance task shall be recorded. The average cumulative number of hours per week needed to perform both preventive and corrective maintenance tasks shall not exceed the requirements of the applicable component specification. Fault correction time for corrective maintenance tasks and servicing time for preventive maintenance tasks shall be recorded separately.
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