TRACKER_OUTPUT_UNAVAILABLE
Applicable alarms (1)
Likely outcomes — click to expand
Based on 883,638 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 5,903 ZERP issues filed on these missions)
Top work orders
- EV3: Inspect Aircraft after Droid Left Behind (DLB) · MAINTENANCE_ACTION 247
- Reset Droid after DLB · REPAIR 151
- Troubleshoot Hover Motor Resistance on Aircraft · INSPECTION 78
- Offload Droid Logs after DLB · ADMINISTRATIVE 74
- EV2: Troubleshoot Electrical Contacts on Aircraft and Droid · INSPECTION 72
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| SERVO, ASSY, UNIVERSAL, P2 | 20398 | 1,014 |
| ASSY, SPOOL AND LINE, DOCKING FIN | 48477 | 915 |
| CCW HOVER MOTOR ASSY, ZIP, P2 | 19607 | 828 |
| PRE-PREG TAIL ASSY STBD(RH), ZIP, P2 | 21840 | 624 |
| TAIL PORT, ZIP, P2 | 31280 | 594 |
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm indicates that Exec is not receiving fresh tracker output within the watchdog timeout.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
power-cycle-aircraft-and-attempt-again["<small><b>Step 1</b></small><br/>Action: Power Cycle Aircraft/procedures/po..."]
send-health-checks-mission["<small><b>Step 2</b></small><br/>Action: Send a Health Checks mission."]
did-the-mission-pass{"<small><b>Step 3</b></small><br/>Question: Did the mission pass and is the alarm..."}
return-the-aircraft-to-service["<small><b>Step 4</b></small><br/>Action: Return the aircraft back to service."]
escalate-to-zip-aircraft-perception{{"<small><b>Step 5</b></small><br/>Escalation: Escalate to Zip Aircraft Perception."}}
power-cycle-aircraft-and-attempt-again --> send-health-checks-mission
send-health-checks-mission --> did-the-mission-pass
did-the-mission-pass -->|Yes| return-the-aircraft-to-service
did-the-mission-pass -->|No| escalate-to-zip-aircraft-perception
style power-cycle-aircraft-and-attempt-again fill:#dcfce7,stroke:#22c55e,color:#14532d
style send-health-checks-mission fill:#dcfce7,stroke:#22c55e,color:#14532d
style did-the-mission-pass fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style return-the-aircraft-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style escalate-to-zip-aircraft-perception fill:#fef3c7,stroke:#f59e0b,color:#78350f Hover or focus a block to preview it. Select the block to keep the preview open.
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.
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