SW_BRICK_IMBALANCE_CRITICAL
Applicable alarms (1)
Likely outcomes — click to expand
Based on 5 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 6 ZERP issues filed on these missions)
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| BATTERY ASSY, ZIP, P2 | 27158 | 7 |
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 bricks are severely imbalanced.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
load-the-failed-mission-and-inspect-the-plot["<small><b>Step 1</b></small><br/>Telemetry: Enter the mission ID from the failed ..."]
was-it-only-a-single-failed-datapoint{"<small><b>Step 2</b></small><br/>Question: Does the imbalance plot show only a s..."}
single-erroneous-datapoint-return-to-service["<small><b>Step 3</b></small><br/>Action: The imbalance alarm was triggered by ..."]
more-than-one-exceeding-datapoints-swap-the-battery{{"<small><b>Step 4</b></small><br/>Escalation: Escalate to Powertrain On Call."}}
escalate-to-pwt-on-call{{"<small><b>Step 5</b></small><br/>Escalation: Escalate to Powertrain On Call."}}
load-the-failed-mission-and-inspect-the-plot --> was-it-only-a-single-failed-datapoint
was-it-only-a-single-failed-datapoint -->|One Exceeding Datapoint| single-erroneous-datapoint-return-to-service
was-it-only-a-single-failed-datapoint -->|More than 1 Exceeding Datap...| more-than-one-exceeding-datapoints-swap-the-battery
was-it-only-a-single-failed-datapoint -->|Cannot Confidently Read/Det...| escalate-to-pwt-on-call
style was-it-only-a-single-failed-datapoint fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style single-erroneous-datapoint-return-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style more-than-one-exceeding-datapoints-swap-the-battery fill:#fef3c7,stroke:#f59e0b,color:#78350f
style escalate-to-pwt-on-call fill:#fef3c7,stroke:#f59e0b,color:#78350f Hover or focus a block to preview it. Select the block to keep the preview open.
This is a single erroneous reading with a slow decreasing ramp because of our filtering logic. Missions that look like this should NOT cause a battery swap.
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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