NASA-LLIS-6036

NASA - National Aeronautics and Space Administration (NASA)

Lessons Learned - Ground Umbilical Carrier Assembly Gaseous Hydrogen Leak Investigation

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NASA - National Aeronautics and Space Administration (NASA)

Year: 2011

Abstract: A 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.

URI: http://yse.yabesh.ir/std;query=author:%22NAVY%20-%206159DD6E273C9FCD0Facil/handle/yse/219908

Subject: Additional Categories.Cryogenic Systems

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NASA - National Aeronautics and Space Administration (NASA)

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contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T18:38:06Z
date available	2017-09-04T18:38:06Z
date copyright	08/03/2011
date issued	2011
identifier other	JOYEOEAAAAAAAAAA.pdf
identifier uri	http://yse.yabesh.ir/std;query=author:%22NAVY%20-%206159DD6E273C9FCD0Facil/handle/yse/219908
description abstract	A 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.
language	English
title	NASA-LLIS-6036	num
title	Lessons Learned - Ground Umbilical Carrier Assembly Gaseous Hydrogen Leak Investigation	en
type	standard
page	4
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;2011
contenttype	fulltext
subject keywords	Additional Categories.Cryogenic Systems
subject keywords	Additional Categories.Flight Equipment
subject keywords	Additional Categories.Ground Equipment
subject keywords	Additional Categories.Ground Operations
subject keywords	Additional Categories.Hardware
subject keywords	Additional Categories.Launch Process
subject keywords	Additional Categories.Launch Vehicle
subject keywords	Additional Categories.Parts
subject keywords	Materials
subject keywords	& Processes
subject keywords	Additional Categories.Test & Verification
subject keywords	Engineering Design (Phase C/D).Launch Systems
subject keywords	Integration and Testing
subject keywords	Manufacturing and Assembly
subject keywords	Mission Operations and Ground Support Systems.Ground processing and manifesting
subject keywords	Mission Operations and Ground Support Systems.Ground support systems
subject keywords	Mission Operations and Ground Support Systems.Launch support systems
subject keywords	Mission Operations and Ground Support Systems.Mission operations systems
subject keywords	Program Management.Configuration and data management
subject keywords	Program Management.Cross Agency coordination
subject keywords	Safety and Mission Assurance.Product Assurance
subject keywords	Safety and Mission Assurance.Quality
subject keywords	Systems Engineering and Analysis.Engineering design and project processes and standards
subject keywords	Systems Engineering and Analysis.Planning of requirements verification processes