CONTROLLER_STUCK_ON_DOCK
Applicable alarms (1)
Likely outcomes — click to expand
Based on 103 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 167 ZERP issues filed on these missions)
Top work orders
- EV2: Replace Hover Propeller on Aircraft · MAINTENANCE_ACTION 15
- Aircraft Socket Inspection · TROUBLESHOOTING 13
- Dock Latch Pin Inspection · TROUBLESHOOTING 11
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| CW HOVER PROPELLER BLADE, ZIP, P2 | 31101 | 60 |
| CCW HOVER PROPELLER BLADE, ZIP, P2 | 29857 | 60 |
| CCW HOVER MOTOR ASSY, ZIP, P2 | 19607 | 38 |
| CCW HOVER PROPELLER BLADE - SHD RESIN VARIATION, ZIP, P2 | 40993 | 30 |
| CW HOVER MOTOR ASSY, ZIP, P2 | 33333 | 24 |
Frequently co-occurring alarms (% of the 103 missions above)
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm can occur as the Aircraft begins trying to descend away from the Dock during undocking and detects that it is stuck. If this alarm occurs, it will lead to the mission being failed.
The Aircraft could remain stuck inside the Dock, or it could briefly undock then DockASAP. It should not crash into the barrier.
This alarm is raised either because of:
- Poor zip/dock comms
- A physical issue between the fin and the dock causing the zip to be stuck.
For this guide, your purpose is to determine whether we fall into category 1 or category 2. There are more detailed linked guides for each.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
ground-the-dock-and-aircraft-immediately["<small><b>Step 1</b></small><br/>Action: Ground the Dock and Aircraft immediat..."]
at-this-point-it-is-forbidden-to-reposi["<small><b>Step 2</b></small><br/>Action: **At this point, it is forbidden to r..."]
check-failed-maintenance-validators["<small><b>Step 3</b></small><br/>Telemetry: Load the failed maintenance validator..."]
follow-the-guide-linked-in-the-widget["<small><b>Step 4</b></small><br/>Action: Follow the troubleshooting guide link..."]
check-the-executive-journal-logs-on-comp{"<small><b>Step 5</b></small><br/>Question: Use the backup journal-log path when ..."}
follow-poor-zip-dock-comms-during-undock["<small><b>Step 6</b></small><br/>Action: Follow Poor Zip-Dock Comms During Un..."]
follow-aircraft-stuck-during-undocking-a["<small><b>Step 7</b></small><br/>Action: Follow Aircraft Stuck During Undocki..."]
ground-the-dock-and-aircraft-immediately --> at-this-point-it-is-forbidden-to-reposi
at-this-point-it-is-forbidden-to-reposi --> check-failed-maintenance-validators
check-failed-maintenance-validators -->|Yes| follow-the-guide-linked-in-the-widget
check-failed-maintenance-validators -->|No matching results| check-the-executive-journal-logs-on-comp
check-the-executive-journal-logs-on-comp -->|Yes, the latch open command...| follow-aircraft-stuck-during-undocking-a
check-the-executive-journal-logs-on-comp -->|No, the latch open command ...| follow-poor-zip-dock-comms-during-undock
style ground-the-dock-and-aircraft-immediately fill:#dcfce7,stroke:#22c55e,color:#14532d
style at-this-point-it-is-forbidden-to-reposi fill:#dcfce7,stroke:#22c55e,color:#14532d
style follow-the-guide-linked-in-the-widget fill:#dcfce7,stroke:#22c55e,color:#14532d
style check-the-executive-journal-logs-on-comp fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style follow-poor-zip-dock-comms-during-undock fill:#dcfce7,stroke:#22c55e,color:#14532d
style follow-aircraft-stuck-during-undocking-a fill:#dcfce7,stroke:#22c55e,color:#14532d Hover or focus a block to preview it. Select the block to keep the preview open.
You will need to manually ground the dock. It is currently not possible for aircraft alarms to automatically ground the dock.
The aircraft should be automatically grounded from this alarm, but ensure that it is.
-
Poor Zip-dock coms during undocking-
Aircraft stuck during undocking after OPEN command receivedNOTE: Validator results may take 15-30 minutes after the flight ends to appear.
Did either matching maintenance validator check fail?
Note: Zip compute_a logs must be fully uploaded. Check the executive journal logs on compute_a. Does it have any line that says:
Received latch open command acknowledgement from dock bridge.? You can use the search box to check:
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.
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