Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 II-l-6.2.3 ~ resDOu. Calibrated accelerometers mounted in and on the store(s), when used with appropriate analyaia equipment, provide the needed response monitoring for both acoustic and mechanical stimuli. Accelerometer positions’in and on the store, at leaat during setup, should be as close as possible to those used to obtain captive-flight data. Accelerometer placement should aim to provide coverage for possible directional variation (e.g.,‘ longitudinal, lateral and vertical axes) and for poaaible extension or radial variation (e.g., fore, mid, aft external, internal”).
Power Spectral Density (PSD) measurement or display (g2/Hz units) plus intensity readings (grinsunits) furnish the needed information for comparing test chamber and captive-flight vibration parameters (see II-2.4). o & 11-1.6.3 Emneratwe mOni torin~. Temperature sensors on the surface of the store(s) provide the best location for monitoring and feedback control. Refer to figure 523.0-7. . b 11-1.6.4 ILumiditv~. Although humidity is not a controlled variable .. for procedure 1, the ducted airstrearnmay be continuously monitored for moisture centent, either by dewpoint or relative humidity sensing.
It should be noted that moisture can collect on a store1s surface when it has reached and holds a cold temperature that is below the dewpoint of warmer air fOllOWinK in, the mission cycle. Thie is a normal aridexpected condition. II-1.6.5 ~ monxto~. . . All electrical inputs to the store(s) should be monitored whether or not they are modified to represent expected mission irregularities. II-2.1 ~. A test plan shall be prepared to document tests using this method. The following areas should be addressed in the ,testplan: S.cme and DUrD~. Test procedures differ with different teat goals (see ~~ble 523.0-1).
A design qualification test might require demonstration of a specific Mean-Time-To-Failure (MTTF), a quantitative value. A Test, Analys6, and Fix (TAAF) during development would be qualitative in nature since its primary’purpose is the identification of failure modes to be expected in servioe. b. Test ite ma. The items to be tested must be clearly identified. Their service designation, source, and exact configuration should be recorded. Drawing numbers or other specific documentation should be referenced. e, g o. List those to be used in the test. d. ~lure crlt~. These must be clearly stated and be based on the performance monitoring system to be used. a e. -Failurea~.
Indicate how failures are to be analyzed, classified and reported. For example, failures can be classified by cause (suspected strese), subsystem or unit involved, effect on store operation, or responsibility (i.e., bad component or material, poor workmanship, inadequate inspection, deficient dea~~, etc.). o MKTHOD 523.0 19 July 1983 523.0-15