MIL-STD-790G
w/ CHANGE 1
5.2.4.3 Failure and defect analysis capabilities and facilities. The manufacturer shall have, either as part of their facilities or an arrangement with suitable laboratories outside of their facilities, proper capabilities to perform failure and defect analysis.
5.2.5 Corrective action. Where failures or defects are greater than the prescribed limits, the manufacturer shall prepare a recommendation for corrective action. Corrective Action recommendations for performance failures shall include failure mode information when established and shall be supported by verifying information, or a proposed evaluation test plan. Corrective actions on parts covered by the specification shall not be made without approval from the qualifying activity, except those actions which consist only of improvements in control operations. Corrective action affecting control procedures shall not be implemented for production until approved by qualified personnel.
5.2.5.1 Production of prototype parts for evaluation. Prototype parts for change evaluation shall be produced on the controlled production line to the point at which the proposed corrective change must be made; the change shall then be effected; and the changed prototype parts shall then be continued
through the balance of the normal series of production operations. Shipment of product incorporating the change shall not occur until approved by the qualifying activity.
5.2.6 Clean rooms. When the military product specification includes the requirements of a clean room, airborne particulate class limits shall be defined. The proper class shall be specified by the manufacturer's design activity in the process specification (ISO 14644-1 and ISO 14644-2 may be used as a guideline). The manufacturer shall establish action and absolute control limits (at which point work stops until corrective action is completed) based on historical data and criticality of the process in each particular area.
5.2.7 Description of production processes and controls. The manufacturer shall maintain a system that details the production processes, steps, and controls applied to parts currently produced and proposed
for inclusion in this program. Requirements and tolerances shall be specified for all critical environments and utilities which come in contact with the production and test of electrical, electronic, and fiber optic parts. When applicable, the system shall include such items as:
a. List of process control equipment and periodic calibrations. b. Control of chemical purity and ionization of water.
c. Known composition of all gases and chemicals, including degree and type of contamination, used in the processes and control of fabrication.
d. Definition of maximum permissible variations in voltage used in the processes or supplied to the test equipment which may introduce errors or variations in the performance or inaccuracies in test data.
e. Definition of clean rooms or other controlled atmospheric requirements. f. Process specifications showing process tolerances.
g. Detailed engineering specification requirements covering types of parts.
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