MAXIMUM_UPTIME_ELAPSED
Applicable alarms (1)
Likely outcomes — click to expand
Based on 615 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 33 ZERP issues filed on these missions)
Frequently co-occurring alarms (% of the 615 missions above)
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”MAXIMUM_UPTIME_ELAPSED means the system has been running for an extended period of time and requires a reboot. Perform a reboot using the Zip Off command in FleetWrangler. Do not reattempt the mission. Wait 2 minutes, then use the dock command wake up zip to power the aircraft back on. After the reboot, verify that the alarm is cleared in Live Alarms. Confirm that Serviceability shows Ready to fly and Ready to deliver before returning the aircraft to service.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
perform-fleetwrangler-reboot["<small><b>Step 1</b></small><br/>Action: Do not reattempt the mission. In Flee..."]
verify-live-alarm-cleared{"<small><b>Step 2</b></small><br/>Question: View the **Live Alarms** section. Con..."}
escalate-to-embedded-linux-oncall{{"<small><b>Step 3</b></small><br/>Escalation: Escalate to P2 Embedded Linux On Call..."}}
return-the-aircraft-to-service("<small><b>Step 4</b></small><br/>Reference: With MAXIMUM_UPTIME_ELAPSED cleared...")
refer-to-other-serviceability-alarm("<small><b>Step 5</b></small><br/>Reference: View the alarm preventing Serviceabil...")
perform-fleetwrangler-reboot --> verify-live-alarm-cleared
verify-live-alarm-cleared -->|MAXIMUM_UPTIME_ELAPSED is c...| return-the-aircraft-to-service
verify-live-alarm-cleared -->|MAXIMUM_UPTIME_ELAPSED is s...| escalate-to-embedded-linux-oncall
verify-live-alarm-cleared -->|MAXIMUM_UPTIME_ELAPSED is c...| refer-to-other-serviceability-alarm
style perform-fleetwrangler-reboot fill:#dcfce7,stroke:#22c55e,color:#14532d
style verify-live-alarm-cleared fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style escalate-to-embedded-linux-oncall fill:#fef3c7,stroke:#f59e0b,color:#78350f
style return-the-aircraft-to-service fill:#f3e8ff,stroke:#a855f7,color:#581c87
style refer-to-other-serviceability-alarm fill:#f3e8ff,stroke:#a855f7,color:#581c87 Hover or focus a block to preview it. Select the block to keep the preview open.
MAXIMUM_UPTIME_ELAPSED is not present. Also confirm Serviceability shows Ready to fly and Ready to deliver.
MAXIMUM_UPTIME_ELAPSED cleared and Serviceability showing Ready to fly and Ready to deliver, return the aircraft to service.
Resolution note
This plaintext block is ready to paste into the Resolution Note field on the ZERP issue you're working. The permalink below gives engineering review access to the full step-by-step timeline including any back-navigation; share it if the case needs a deeper look.
Permalink:
Session is too large to fit in a URL. Use Download session JSON to share the timeline out-of-band.
Did this guide help you get unblocked?
Open suggestions
There are no open suggestions.
Open pull requests
There are no open pull requests.