SW_PACK_TEMPERATURE_GRADIENT_WARNING
Applicable alarms (1)
Likely outcomes — click to expand
Based on 25 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 28 ZERP issues filed on these missions)
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| BATTERY ASSY, ZIP, P2 | 27158 | 65 |
| TAIL ASY, DEPOPULATED, STBD (RH), ZIP, P2 | 0108359 | 20 |
| TAIL ASM, PORT(LH), 3D PRINT PART, GNSS WITH LONG ENGAGMENT, ZIP, P2 | 0108336 | 20 |
| CCW HOVER MOTOR ASSY, ZIP, P2 | 19607 | 12 |
| BATTERY, DROID, P2 | 24544 | 12 |
Frequently co-occurring alarms (% of the 25 missions above)
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm occurs when the Aircraft battery pack temperature gradient is high (greater than 12°C), often times when the ambient temperature is below 0°C. We are seeing this alarm trigger slightly more on EV3 compared to EV2 because of the heat spreader architecture on the new EV3 batteries. That alarm will clear itself once the zip is docked and the battery is warmed enough to reduce the temperature gradient to functional levels (8°C).
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
wait-for-the-battery-to-be-conditioned["<small><b>Step 1</b></small><br/>Action: Wait for the battery to be conditione..."]
if-this-alarm-doesn-t-clear-for-30-mi{{"<small><b>Step 2</b></small><br/>Escalation: If this alarm doesn’t clear for 30+ m..."}}
wait-for-the-battery-to-be-conditioned --> if-this-alarm-doesn-t-clear-for-30-mi
style wait-for-the-battery-to-be-conditioned fill:#dcfce7,stroke:#22c55e,color:#14532d
style if-this-alarm-doesn-t-clear-for-30-mi 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.
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.