MOTOR_PERFORMANCE_DEGRADED_TEMPORARILY
Applicable alarms (1)
Likely outcomes — click to expand
Based on 818 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 486 ZERP issues filed on these missions)
Top work orders
- EV2: Replace Hover Motor on Aircraft · MAINTENANCE_ACTION 32
- EV2: Replace Hover Propeller on Aircraft · MAINTENANCE_ACTION 24
- EV2: Replace Aft Motor Assembly on Aircraft · MAINTENANCE_ACTION 23
- EV3: Replace Wing on Aircraft · MAINTENANCE_ACTION 19
- EV2: Replace Mixed Motor on Aircraft Aft Motor Assembly · MAINTENANCE_ACTION 15
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| CCW HOVER MOTOR ASSY, ZIP, P2 | 19607 | 266 |
| CW HOVER MOTOR ASSY, ZIP, P2 | 33333 | 190 |
| AFT MOTOR ASSY, ZIP, P2 | 23548 | 165 |
| LONG WING ASM, PORT(LH), ZIP, P2 | 0100553 | 114 |
| LONG WING ASM,STRBRD(RH), ZIP, P2 | 0108493 | 114 |
Frequently co-occurring alarms (% of the 818 missions above)
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm is triggered when the motor hardware is getting close to its rated thermal limits. It triggers a DOCK_ASAP response. Maintenance action is not required for this alarm, it exists to drive a system-level response in flight. The off-nominals below will trigger this alarm:
- LAN8770_TEMP_ABOVE_SPEC (mixed)
- LAN9370_TEMP_ABOVE_SPEC (hover)
- MCU_TEMP_ABOVE_SPEC (mixed, hover)
- MOTOR_OVERTEMPERATURE (mixed, hover)
- MOTOR_OVERTEMPERATURE_ESTIMATED (servo, droid thrusters)
graph TD
find-the-off-nominal-that-set-this-alar["<small><b>Step 1</b></small><br/>Action: Find the off-nominal that set this al..."]
did-the-off-nominal-motor-overtemperatur{"<small><b>Step 2</b></small><br/>Question: Did the off-nominal MOTOR_OVERTEMPER..."}
wait-10-minutes-to-let-the-motor-cool-d["<small><b>Step 3</b></small><br/>Action: Wait 10 minutes to let the motor cool..."]
return-to-service["<small><b>Step 4</b></small><br/>Action: Return to service."]
find-the-off-nominal-that-set-this-alar --> did-the-off-nominal-motor-overtemperatur
did-the-off-nominal-motor-overtemperatur -->|Yes| wait-10-minutes-to-let-the-motor-cool-d
did-the-off-nominal-motor-overtemperatur -->|No| return-to-service
wait-10-minutes-to-let-the-motor-cool-d --> return-to-service
style find-the-off-nominal-that-set-this-alar fill:#dcfce7,stroke:#22c55e,color:#14532d
style did-the-off-nominal-motor-overtemperatur fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style wait-10-minutes-to-let-the-motor-cool-d fill:#dcfce7,stroke:#22c55e,color:#14532d
style return-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d Hover or focus a block to preview it. Select the block to keep the preview open.
MOTOR_OVERTEMPERATURE_ESTIMATED set the alarm?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
Open pull requests
There are no open pull requests.