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Now showing items 21-30 of 35
NASA-LLIS-1805: Lessons Learned – Mars Global Surveyor (MGS) Spacecraft Loss of Contact
Abstract: Abstract:
Contact was lost with the Mars Global Surveyor (MGS) spacecraft in November 2006 during its 4th extended mission. A routine memory load command sent to an incorrect address 5 months earlier ...
Contact was lost with the Mars Global Surveyor (MGS) spacecraft in November 2006 during its 4th extended mission. A routine memory load command sent to an incorrect address 5 months earlier ...
NASA-LLIS-6196: Lessons Learned - Shaker Self-Check Unexpectedly Exceeded the Dynamic Test Limit
Abstract: Shaker system control software generates a self check immediately prior to a test at a signal level that is normally considered to be of insignificant strength compared to test levels. During a dynamic test of the Juno ...
NASA-LLIS-1733: Lessons Learned – Genesis Sample Return Mishap (2004)
Abstract: Abstract:
The Genesis sample return mishap was attributed to a design error in which the gravity switches that activate the parachute deployment sequence were phased (oriented) incorrectly so that their ...
The Genesis sample return mishap was attributed to a design error in which the gravity switches that activate the parachute deployment sequence were phased (oriented) incorrectly so that their ...
NASA-LLIS-1807: Lessons Learned – Inheritance Review of the Mars Phoenix Flight System
Abstract: Abstract:
Despite the unusually large percentage of the Phoenix design and hardware that was inherited from previous Mars spaceflight projects, the format used for Phoenix project system and subsystem ...
Despite the unusually large percentage of the Phoenix design and hardware that was inherited from previous Mars spaceflight projects, the format used for Phoenix project system and subsystem ...
NASA-LLIS-1878: Lessons Learned - Contamination from Flaked Silver Plating Off Waveguides and Microwave Components
Abstract: Abstract:
Poorly plated RF waveguides pose a low to moderate risk of corona or arcing in NASA spacecraft that are presently in operation or under development. If use of plated waveguides cannot be ...
Poorly plated RF waveguides pose a low to moderate risk of corona or arcing in NASA spacecraft that are presently in operation or under development. If use of plated waveguides cannot be ...
NASA-LLIS-1796: Lessons Learned - MRO Waveguide Transfer Switch Anomaly
Abstract: Abstract:
A waveguide transfer switch failed five months after the insertion of Mars Reconnaissance Orbiter into Mars orbit. The likely cause was debris-induced RF breakdown that pyrolized a polyimide ...
A waveguide transfer switch failed five months after the insertion of Mars Reconnaissance Orbiter into Mars orbit. The likely cause was debris-induced RF breakdown that pyrolized a polyimide ...
NASA-LLIS-2057: Lessons Learned – The Vapor Deposited Aluminum (VDA) Coating Process Can Affect Payload Performance
Abstract: Abstract:
Vapor deposited aluminum (VDA) coating, performed according to specification on the OSTM/ Jason-2 AMR reflector, caused discontinuities that required rework using a modified VDA process. VDA ...
Vapor deposited aluminum (VDA) coating, performed according to specification on the OSTM/ Jason-2 AMR reflector, caused discontinuities that required rework using a modified VDA process. VDA ...
NASA-LLIS-2376: Lessons Learned - Cosmic Background Explorer (COBE) On Orbit Engineering Performance
Abstract: Abstract:
The Cosmic Background Explorer (COBE) successfully launched on November 18, 1989, following a postponement due the the Challenger Shuttle Accident. The spacecraft enabled NASA scientist Dr. ...
The Cosmic Background Explorer (COBE) successfully launched on November 18, 1989, following a postponement due the the Challenger Shuttle Accident. The spacecraft enabled NASA scientist Dr. ...
NASA-LLIS-1712: Lessons Learned - If You Don't Understand an Environment, Provide 'Well-Margined' Capabilities to Encompass the Worst Case
Abstract: Abstract:
Mars Exploration Rover designers responded to a high level of uncertainty regarding Martian winds by providing a set of small, sideways-pointing rockets and adding a capability to directly ...
Mars Exploration Rover designers responded to a high level of uncertainty regarding Martian winds by providing a set of small, sideways-pointing rockets and adding a capability to directly ...
NASA-LLIS-2476: Lessons Learned – Place Flight Scripts Under Configuration Management Prior to ORT
Abstract: Abstract:
When flight scripts developed independently by project personnel are not placed under configuration control early enough in flight software development, multiple versions of the scripts tend ...
When flight scripts developed independently by project personnel are not placed under configuration control early enough in flight software development, multiple versions of the scripts tend ...