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NASA-LLIS-5479: Lessons Learned - Proper Manufacturing, Handling, Use, Storage and Care Of Metal Bellows Flex Hoses
Abstract: Metal bellows flex hoses are very susceptible to reverse bending low cycle fatigue which results in leakage via a through crack in the bellows.
NASA-LLIS-6148: Lessons Learned - Continuous Hazardous Gas Monitoring In The Shuttle Aft During Flight
Abstract: The Space Shuttle Orbiter aft hazardous gas grab bottles provided an indication of gas leak in specific locations in the Orbiter during ascent and data was obtained post mission. Future vehicles need to include real-time ...
NASA-LLIS-6149: Lessons Learned - Don’t Purge Dead-Headed Hydrogen Lines With Helium Downstream Of Source
Abstract: Residual hydrogen in the fill and drain line during the terminal count down sequence could lead to a catastrophic failure. The best practice is to connect the purge line to the propellant line as closely as possible to the ...