MIL-HDBK-1839A
BIT and BITE could be a high level of false rejects resulting in unnecessary rework of good systems or worse yet, false acceptances of out of tolerance conditions, resulting in systems erroneously identified as mission ready when they are not.
"5.3 System, subsystem, and equipment test points. The design activity shall ensure measurements can be accomplished, test points are identified in technical data, and can be found in the system and/or equipment, and are accessible with minimum disturbance to configuration of the system and/or equipment."
Interpretive guidance: Ready access to calibration test points provides the following: minimal disruption to the integrity of the system for calibration purposes, reduced safety risk to calibration personnel, reduction in the likelihood of equipment failures induced during calibration, and increased efficiency of the calibration.
5.4 Test, Measurement, and Diagnostic Equipment (TMDE).
"5.4.1 Recommended TMDE. The design activity shall ensure that TMDE is recommended to satisfy all measurement requirements identified in accordance with sections 5.1 and 5.2 of this standard.
a. The TMDE recommended shall be capable of functioning in the system operational measurement environment and satisfy all parameters of each measurement (see 5.4.3).
b. The design activity shall assess TMDE specifications in support of measurement requirements identified in accordance with sections 5.1 and 5.2 of this standard. Where several items of TMDE are used in combination, the overall test configuration specification and uncertainty shall be documented."
Interpretive guidance: MIL-HDBK-300 provides guidance on the selection of TMDE. BITE is considered to be TMDE for calibration and CMRS purposes.
"5.4.2 TMDE in support of TMDE.
a. The design activity shall identify calibration equipment and standards required to support TMDE recommendations which are not currently supportable (i.e. not listed with calibration procedures and intervals) by the applicable military department metrology and calibration program. Refer to Air Force TO 33K-1-100-1/2, Army TB 43-180, Navy NAVAIR 17-35MTL-1, or Marine Corps TM-10510-14/1 to determine TMDE supportability. Refer to Air Force TO 33K-1-101, Army
TB 43-180 or Navy NAVAIR 17-35NCE-1 and MIL-HDBK-300 to identify existing military department calibration equipment and standards. If existing applicable military department calibration equipment and/or standards will not meet the requirements, the design activity shall recommend equipment and/or standards and a narrative justification shall be documented.
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