MIL-HDBK-1839A
Interpretive guidance: BITE needs to be addressed in the CMRS. If the BITE makes measurements resulting in test decisions then the BITE needs to be assessed for traceability and the results documented in the CMRS.
"3.12 Calibration interval. The maximum time an item, requiring calibration, may go between calibrations and still achieve its target measurement reliability."
Interpretive guidance: The period of time a calibration is valid. The length of time between a calibration and the next calibration due date. Measurement reliability is the probability of equipment remaining in tolerance throughout the calibration interval.
4. GENERAL REQUIREMENTS
"4.1 General measurement requirements. The design activity shall ensure the following actions are accomplished for the affected systems and equipment throughout their life cycle:
a. All parameters that require measurement to ensure proper and accurate operation of the system and equipment are identified and documented."
Interpretive guidance: Special attention should be paid to ensure that all parameters are addressed. Tools available to help are; maintenance plans, maintenance manuals, fault tree analysis, test requirements documents, test plans, LSA documentation, etc.
"b. Calibration and measurement actions are conducted as required to maintain accurate operation. Such actions are to be accomplished at all applicable system and subsystem levels and are appropriately integrated into the total system requirements."
Interpretive guidance: Calibration and measurement actions conducted will be thorough so that system and subsystem performance can be adequately assessed.
"c. All parameters are readily accessible and measurable in a manner that minimizes the number and duration of the tests required."
Interpretive guidance: Both physical access and/or access via software needs to be considered. "d. Measurement traceability of all system and subsystem parameters is documented." Interpretive guidance: The traceability chain should be documented to the extent necessary to
determine that it is unbroken from the end item through to the national or international standard or
other DOD approved sources for all parameters including BIT and BITE (see 3.4).
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