scope:

This lesson learned provides a summary of ground operations lessons learned for the Space Shuttle Atmospheric Revitalization and Pressure Control System compiled in June 2011. Lessons learned topics covered include: composite overwrap pressure vessel stress rupture failure mode, O2/N2 flow sensor problems, ground support equipment pressure distribution unit calibration, negative pressure relief valve failure to reseat, fire bottle quantity verification, test requirements, latching valves and position indication, and cabin leak checks.