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Unformatted text preview: ance requirements are verified,
while analyses and models are updated as test data are
acquired. Safety requirements, defined by hazard
analysis reports, may also be satisfied by qualification
Qualification usually occurs at the component or
subsystem level, but could occur at the system level as
well. When a project decides against building dedicated
qualification hardware, and uses the flight hardware
itself for qualification purposes, the process is termed
protoflight. Additional information on protoflight testing is
contained in MSFC-HDBK-670, General Environmental
Test Guidelines (GETG) for Protoflight Instruments and
6.6.4 Acceptance Verification The acceptance stage verification activities
provide the assurance that the flight hardware and
software are in NASA Systems Engineering Handbook
Integrating Engineering Specialties Into the Systems Engineering Process
compliance with all functional, performance, and design
requirements, and are ready for shipment to the launch
site. The acceptance stage begins with the acceptance
of each individual component or piece part for assembly
into the flight article and continues through the SAR.
Some verifications cannot be performed after a
flight article, especially a large one, has been
assembled and integrated (e.g., due to inaccessability).
When this occurs, these verifications are performed
during fabrication and integration, and are known as
in-process tests. Acceptance testing, then, begins with
in-process testing and continues through functional
testing, environmental testing, and end-to-end
compatibility testing. Functional testing normally begins
at the component level and continues at the systems
level, ending with all systems operating simultaneously.
All tests are performed in accordance with requirements
defined in the VRSD. When flight hardware is
unavailable, or its use is inappropriate for a specific test,
simulators may be used to verify interfaces. Anomalies
occurring during a test are documented on the
appropriate reporting system (NCR or P/FR),...
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