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NASA-LLIS-0939
Lessons Learned – MPL Uplink Loss Timer Software/Test Errors (1998)
Year: 2001
Abstract: Abstract:
Prelaunch tests and verification of software and hardware used to switch to a redundant string should include assumed failures in either string during all mission phases. MPL did not verify the ability of the Lander to switch to the redundant uplink string after landing assuming a failure in the primary string had occurred during earlier entry, descent and landing phases. Recognize that transitions to another mission phase are high-risk sequences and that database changes that impact logic decisions should be retested.
Prelaunch tests and verification of software and hardware used to switch to a redundant string should include assumed failures in either string during all mission phases. MPL did not verify the ability of the Lander to switch to the redundant uplink string after landing assuming a failure in the primary string had occurred during earlier entry, descent and landing phases. Recognize that transitions to another mission phase are high-risk sequences and that database changes that impact logic decisions should be retested.
Subject: Fault Tolerance
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:48:20Z | |
| date available | 2017-09-04T15:48:20Z | |
| date copyright | 02/15/2001 | |
| date issued | 2001 | |
| identifier other | QAUEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/51244 | |
| description abstract | Abstract: Prelaunch tests and verification of software and hardware used to switch to a redundant string should include assumed failures in either string during all mission phases. MPL did not verify the ability of the Lander to switch to the redundant uplink string after landing assuming a failure in the primary string had occurred during earlier entry, descent and landing phases. Recognize that transitions to another mission phase are high-risk sequences and that database changes that impact logic decisions should be retested. | |
| language | English | |
| title | NASA-LLIS-0939 | num |
| title | Lessons Learned – MPL Uplink Loss Timer Software/Test Errors (1998) | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2001 | |
| contenttype | fulltext | |
| subject keywords | Fault Tolerance | |
| subject keywords | Flight Equipment | |
| subject keywords | Policy & Planning | |
| subject keywords | Redundancy Verification | |
| subject keywords | Risk Management/Assessment | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Software | |
| subject keywords | Software Test | |
| subject keywords | Spacecraft | |
| subject keywords | System Integration and Test | |
| subject keywords | Test & Verification | |
| subject keywords | Test Planning |