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NASA-LLIS-6036

Lessons Learned - Ground Umbilical Carrier Assembly Gaseous Hydrogen Leak Investigation

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T18:38:06Z
date available2017-09-04T18:38:06Z
date copyright08/03/2011
date issued2011
identifier otherJOYEOEAAAAAAAAAA.pdf
identifier urihttp://yse.yabesh.ir/std;query=author:%22NAVY%20-%206159DD6E273C9FCD0Facil/handle/yse/219908
description abstractA gaseous hydrogen (GH2) leak occurred on 03/11/09, during the STS-119/ET-127 cryogenic loading for flight, and was repaired with a "fix to fly" approach by replacing the flight seal and the Ground Umbilical Carrier Assembly (GUCA) quick disconnect (QD. There was no attempt to determine the cause of the leak before the repair. An anomaly resolution team was assembled after the launch to determine the long-term approach.
In successfully mating the GUCA QD to the External Tank Carrier Assembly (ETCA), the following factors play key roles: Ground Umbilical Carrier Plate (GUPC) concentricity, QD probe/flange concentricity, two-piece seal, the GUCA QD's Inconel bellows, vent line loads, alignment between the ETCA and the flight carrier plate, alignment of the hinge support brackets, and the pyrotechnic bolt. Of these eight factors, GUCP concentricity and QD probe/flange concentricity can be adjusted within limitations.
Attached to this lesson is the GUCA GH2 Leak Investigation White Paper, which provides details of the investigation and process changes.
languageEnglish
titleNASA-LLIS-6036num
titleLessons Learned - Ground Umbilical Carrier Assembly Gaseous Hydrogen Leak Investigationen
typestandard
page4
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;2011
contenttypefulltext
subject keywordsAdditional Categories.Cryogenic Systems
subject keywordsAdditional Categories.Flight Equipment
subject keywordsAdditional Categories.Ground Equipment
subject keywordsAdditional Categories.Ground Operations
subject keywordsAdditional Categories.Hardware
subject keywordsAdditional Categories.Launch Process
subject keywordsAdditional Categories.Launch Vehicle
subject keywordsAdditional Categories.Parts
subject keywordsMaterials
subject keywords& Processes
subject keywordsAdditional Categories.Test & Verification
subject keywordsEngineering Design (Phase C/D).Launch Systems
subject keywordsIntegration and Testing
subject keywordsManufacturing and Assembly
subject keywordsMission Operations and Ground Support Systems.Ground processing and manifesting
subject keywordsMission Operations and Ground Support Systems.Ground support systems
subject keywordsMission Operations and Ground Support Systems.Launch support systems
subject keywordsMission Operations and Ground Support Systems.Mission operations systems
subject keywordsProgram Management.Configuration and data management
subject keywordsProgram Management.Cross Agency coordination
subject keywordsSafety and Mission Assurance.Product Assurance
subject keywordsSafety and Mission Assurance.Quality
subject keywordsSystems Engineering and Analysis.Engineering design and project processes and standards
subject keywordsSystems Engineering and Analysis.Planning of requirements verification processes


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