AFGS�87219B APPENDIX A
REQUIREMENT LESSONS LEARNED (A.3.2.10)
Typically, the most critical environmental factors for electrical power systems are temperature and vibration. Other factors such as humidity and salt fog affect some components, depending upon their design. Vibration levels are very dependent upon the location in the aircraft and must be adequately specified.
A.4.2.10 Environmental conditions.
The capability of the EPS and its components to perform as required under all specified environmental conditions shall be verified by analyses and tests as follows: ------------.
VERIFICATION RATIONALE (A.4.2.10)
Analyses are required to determine the aircraft environment for most EPS components. Component environmental tests are needed to verify component compatibility with the environment. The laboratory is the only place where all environmental conditions can be simulated using various chambers for temperature, altitude and humidity along with other test equipment such as vibration machines.
VERIFICATION GUIDANCE (A.4.2.10)
a. Ensure that the storage and operational environments for each component are determined prior to component development or selection.
b. Depending on the equipment, the environmental tests should be tailored to evaluate its critical characteristics. The classical methods of environmental testing are presented in MIL-STD-810. These should be used whenever they can be determined to be applicable or where they simulate operational conditions.
Some environmental tests are long and costly. Only those tests required to ensure compliance with the requirements should be specified. Certain tests such as fungus can be eliminated if the contractor provides certification that no material which supports fungal growth has been used. When equipment is hermetically sealed, salt spray, rain, humidity, dust and fungus tests may be conducted on empty equipment cans only to test paint connectors, external hardware, etc.
This usually results in a savings of time and money.
VERIFICATION LESSONS LEARNED (A.4.2.10)
Several lessons have been learned during environmental verification testing. Most of the lessons have been included in MIL-STD-810 test procedures. Mounting of equipment during vibration testing has been found to be critical. It is important that the mounting fixture not amplify or reduce the vibration which the equipment experiences.
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