Wired Zip Droid Heartbeat Unavailable
Applicable alarms (1)
Likely outcomes — click to expand
Based on 6,741 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 120 ZERP issues filed on these missions)
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| SERVO, ASSY, UNIVERSAL, P2 | 20398 | 50 |
| DOCKING FIN WINCH ASSY, ZIP, P2 | 24084 | 11 |
| CCW HOVER MOTOR ASSY, ZIP, P2 | 19607 | 8 |
| DOCKING FIN WINCH LRU, AIRCRAFT, P2 | 48561 | 7 |
| BATTERY ASSY, ZIP, P2 | 27158 | 5 |
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm occurs when Zip Exec has not received a wired Zip-Droid heartbeat status message within the watchdog timeout. If this alarm occurs in flight, Zip Exec will have one less signal to determine if the Droid is stowed in the Zip.
This alarm may be caused by the network agent crashing, running at too slow of a rate, or publishing too infrequently. This alarm might also be caused by compute performance issues and IPC issues. In these cases, multiple watchdog alarms will be activated.
Exec watchdog alarm
Section titled “Exec watchdog alarm”- WIRED_ZIP_DROID_HEARTBEAT_UNAVAILABLE
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
alarm-occurs-during-pre-flight-or-in-fl{"<small><b>Step 1</b></small><br/>Question: When does the alarm occur?"}
restart-the-flight-target-restart-fligh["<small><b>Step 2</b></small><br/>Action: Restart the Flight Target: Restart F..."]
is-the-alarm-still-set{"<small><b>Step 3</b></small><br/>Question: Is the alarm still set?"}
follow-the-guide-for-droid-executive-un("<small><b>Step 4</b></small><br/>Reference: Follow the guide for Droid Executive ...")
if-the-steps-in-that-guide-do-not-resol{{"<small><b>Step 5</b></small><br/>Escalation: If the steps in that guide do not res..."}}
aircraft-can-return-to-service["<small><b>Step 6</b></small><br/>Action: Aircraft can return to service."]
if-this-alarm-occurs-in-flight-the-zip("<small><b>Step 7</b></small><br/>Reference: If this alarm occurs in flight, the Z...")
alarm-occurs-during-pre-flight-or-in-fl -->|Alarm occurs during Pre-Flight| restart-the-flight-target-restart-fligh
alarm-occurs-during-pre-flight-or-in-fl -->|Alarm occurs while In Flight| if-this-alarm-occurs-in-flight-the-zip
restart-the-flight-target-restart-fligh --> is-the-alarm-still-set
is-the-alarm-still-set -->|Yes| follow-the-guide-for-droid-executive-un
is-the-alarm-still-set -->|No| aircraft-can-return-to-service
follow-the-guide-for-droid-executive-un --> if-the-steps-in-that-guide-do-not-resol
style alarm-occurs-during-pre-flight-or-in-fl fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style restart-the-flight-target-restart-fligh fill:#dcfce7,stroke:#22c55e,color:#14532d
style is-the-alarm-still-set fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style follow-the-guide-for-droid-executive-un fill:#f3e8ff,stroke:#a855f7,color:#581c87
style if-the-steps-in-that-guide-do-not-resol fill:#fef3c7,stroke:#f59e0b,color:#78350f
style aircraft-can-return-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style if-this-alarm-occurs-in-flight-the-zip fill:#f3e8ff,stroke:#a855f7,color:#581c87 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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