Description of Driving Event:
Use of High-Fidelity Simulations of On-Orbit Components in MEIT
Lesson(s) Learned:
MEIT is the highest level of integrated testing available before committing ISS elements to launch. In order to produce valid results, this testing requires a high level of fidelity in emulators/simulators used in place of missing components.
Recommendation(s):
The ISS Program should ensure that high-fidelity simulations of on-orbit components are used in the MEIT and that the configurations of those simulators are validated to be in agreement with what has actually been orbited.
Evidence of Recurrence Control Effectiveness:
NASA concurs with the recommendation. The node emulator for MEIT I was built as certified GSE as was the Lab Emulator for MEIT II and III. Emulator design requirements include the emulated flight article's ICDs to the elements under test in MEIT. Activation/Validation and integrated testing confirms emulators meet the emulated flight article's interface requirements and compares emulator performance with the flight article's performance in similar testing. The primary objective of these tests is to certify the emulators act like the flight article for the interfaces under test. The emulators are under configuration management (CM) control and any updates to the flight elements will be checked for potential impacts to the emulators.
Documents Related to Lesson:
N/A
Mission Directorate(s):
- Space Operations
- Exploration Systems
Additional Key Phrase(s):
- Aerospace Safety Advisory Panel
- Computers
- Risk Management/Assessment
- Software
- Test & Verification
- Test Article
- Test Facility
Additional Info:
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