IEEE Spectrum investigation reportOfficial report on project management at NASA
Spacecraft and its missionMission failureFailure causes- root cause
- contributing causes
NASA’s mission planning paradigm
Spacecraft and its missionMission failureFailure causes- root cause
- contributing causes
NASA’s mission planning paradigm
The first weather satellite for another planet The first weather satellite for another planet- profile Martian atmosphere
- map Martian surface
- Mars Polar Lander support
- relay for future missions
Attitude control- coarse: jet thrusters
- fine: 3x flywheels
Single onboard computer- IBM PowerPC 20MHz
- 128MB RAM
- no tape or solid-state recorder
- 18MB flash
Spacecraft and its missionMission failureFailure causes- root cause
- contributing causes
NASA’s mission planning paradigm
went off course by 100 km went off course by 100 km- hit the atmosphere and burned ?
- passed the atmosphere and went on ?
$125.000.000 loss
Spacecraft and its missionMission failureFailure causes- root cause
- contributing causes
NASA’s mission planning paradigm
In NASA nomenclature a root cause is:Along a chain of events leading to a mishap, the first causal action or failure to act that could have been controlled by policy/practice/procedureRoot Cause – failure to use metric system in ground software files used in trajectory models
Assymetric solar arrayAttitude control
In NASA nomenclature a contributing cause is:A factor, event or circumstance which led directly or indirectly to the dominant root cause or which contributed to the severity of the mishap
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Contributing causes- undetected mismodelling of velocity changes
- navigation team unfamilliar with spacecraft
- failure to perform emergency trajectory correction
- poor system engineering process
- informal communication of project teams
- insufficient staff training
- insufficient navigation team stuffing
- poor verification of ground software
Spacecraft and its missionMission failureFailure causes- root cause
- contributing causes
NASA’s mission planning paradigm
„Faster, better, cheaper“ approach
„Mission success first“ approach
„Mission success first“ approach- defining a minimum set of mission success criteria
- sufficient analysis and verification prior to launch
- assurance and robustness of the design
- ability to learn from failure
„Mission success first“ approach- defining a minimum set of mission success criteria
- sufficient analysis and verification prior to launch
- assurance and robustness of the design
- ability to learn from failure
„Mission success first“ approach- defining a minimum set of mission success criteria
- sufficient analysis and verification prior to launch
- assurance and robustness of the design
- ability to learn from failure
„Mission success first“ approach- defining a minimum set of mission success criteria
- sufficient analysis and verification prior to launch
- assurance and robustness of the design
- ability to learn from failure
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