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CO2 Scrubber Unit 1
NOMINAL
→
TEST MODE
Sol: 2
Impact: Redundancy degraded; EVA operations restricted
CO2 Scrubber Unit 2
BACKUP
→
PRIMARY
Sol: 2
Impact: Single-point-of-failure for life support
EVA-01 Schedule
Sol 3 AM
→
Sol 3 PM
Sol: 2
Impact: Schedule pressure on subsequent EVAs
CO2 Scrubber Unit 1
TEST
Running in test mode after restart
CO2 Scrubber Unit 2
NOMINAL
Primary operational
Power Systems
NOMINAL
Solar array and battery backup OK
Communications
NOMINAL
Daily uplink window maintained
◈ Early Warning → Operational Incident
Sol 1 — Signal
Amber warning observed on CO2 Scrubber Unit 1 at 14:32
Sol 2 — Incident
Unit 1 fault shutdown during diagnostic at 09:12; Unit 2 became primary
How Related
The amber warning on Sol 1 was an early indicator of sensor contamination that ultimately caused the Unit 1 shutdown on Sol 2
Escalation Pattern
Warning indicator → monitoring decision → overnight persistence → diagnostic attempt → complete failure
Potential Cascade
If Unit 2 has similar contamination, mission loses all EVA capability and faces life support emergency
⚠ Unit 2 sensor inspection not completed
Why it matters
If Unit 2 has similar contamination, mission loses all EVA capability and faces potential life support emergency
Required before next Sol
Complete Unit 2 sensor inspection and document findings
⚠ Unit 1 test period must reach 24-hour stable operation
Why it matters
Unit 1 cannot return to primary status until test is complete; premature return could cause another failure
Required before next Sol
Monitor Unit 1 test mode through Sol 3 morning; document any anomalies
R-001
Single-scrubber operation
HIGH
OPEN
Mission currently operating with only Unit 2 for atmospheric CO2 processing. If Unit 2 fails, all EVA capability is lost and crew safety is compromised.
Systems: CO2 Scrubber Unit 1, Unit 2, Life Support
First seen: Sol 2
Mitigation: Complete Unit 2 sensor inspection immediately; expedite Unit 1 return to operational status
R-003
Potential Unit 2 contamination
HIGH
OPEN
If dust contamination affected Unit 1, the same environmental conditions may be affecting Unit 2. Unit 2 has not been inspected for similar contamination.
Systems: CO2 Scrubber Unit 2
R-002
Unvalidated improvised procedure
MEDIUM
WATCH
Compressed-air sensor cleaning was performed as improvised workaround. This procedure is not formally validated.
R-004
Schedule pressure cascade
MEDIUM
WATCH
EVA-01 delay creates schedule pressure on subsequent EVAs. If Unit 1 does not return to operational status, further delays are likely.
D-001 · Sol 1
Continue monitoring Unit 1 amber warning rather than immediate troubleshooting
Rationale: Filter appeared clean, no visible contamination. Airflow felt normal. Amber warning may be transient or sensor-related.
Observed consequence: Unit 1 shutdown during diagnostic on Sol 2 at 09:12. The amber warning was an early indicator of sensor contamination that was not addressed.
Owner: Commander Chen
D-002 · Sol 2
Conduct deeper troubleshooting before EVA prep
Rationale: Amber warning persisted overnight, indicating the issue is not transient
Observed consequence: Troubleshooting triggered Unit 1 fault shutdown, but also identified root cause (sensor contamination)
Owner: Commander Chen
D-003 · Sol 2
Delay EVA-01 pending CO2 scrubber resolution
Rationale: Mission plan requires dual-scrubber redundancy for EVA operations
Owner: Commander Chen