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Microelectromechanical Systems and Microstructures in Aerospace 361

nonflight critical components examples are shown herein. In addition, this sample
test plan recognizes two levels of testing: protoflight and acceptance. Protoflight
testing is performed on the protoflight unit or first flight unit if no protoflight unit is
identified. Acceptance testing is performed on all follow-on flight units.
Performance verification (by test, analysis, or a combination of the two) for all
components is performed at both ambient conditions and applicable test levels to
determine the limits at which flight component can operate as intended. The test
levels and exposure durations in this document were selected in view of the fact that
ST5 is a short-term (3 months) demonstration mission.
Environmental tests will include functional and performance testing in as close
to a space flight launch through on orbit environment as possible on Earth. Often
operational tests will be divided into limited or comprehensive performance testing.
As a minimum comprehensive performance testing is in the configuration to be
used in application. The testing will require shock, vibroacoustic, structural tests,
thermal cycling, and thermal vacuum, EMI and EMC, magnetic and Burn-In tests
(operational life). Table 16.3 lists the ambient test conditions required to support the
environmental testing.

16.5.1.1 Test Tolerances
Unless otherwise specified, the maximum allowable tolerances on component test
conditions and measurements shall be as specified as in Table 16.4.

16.5.1.2 Test Documentation
Formal, controlled documentation is required for all critical component testing and
recommended for nonflight critical component testing. Documentation of critical
component testing shall be available for review by the project upon request. At the
least, the critical component documentation shall include:

. Test procedure
. Test configuration
. Test records and logs
. Test data and reports

TABLE 16.3
Ambient Test Conditions

Condition Environment
Temperature 24 + 88C
Humidity (operating) 40 to 70%
Humidity (nonoperating) 20 to 80%
Pressure 12 to 15 psi

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