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Zipline Zipline Service Documentation

    SW_BRICK_IMBALANCE_WARNING

    published Last Updated: Oct 9, 2026 HW: all
    Applicable alarms (1)
    SW_BRICK_IMBALANCE_WARNING
    Likely outcomes (1,130 missions, 74 issues) — click to expand

    Based on 1,130 missions where this alarm fired in the last 90 days as of 2026-10-13

    Grounding vs discrepancy (of 74 ZERP issues filed on these missions)

    Grounding 23% (17 of 74 issues) Discrepancy 77% (57 of 74 issues)

    Frequently replaced parts

    Part P/N Removals
    BATTERY ASSY, ZIP, P2 27158 84
    ASSY, SPOOL AND LINE, DOCKING FIN, AIRCRAFT, P2 48477 43
    TAIL ASM, PORT(LH), OLD GEAR, ZIP, P2 0108336 20
    TAIL ASY, DEPOPULATED, STBD (RH), ZIP, P2 0108359 20
    BATTERY, DROID, P2 24544 18

    Frequently co-occurring alarms (% of the 1,130 missions above)

    CELL_MODEM_NOT_CONNECTED 54.7% of missions ESR_TOO_HIGH 54.4% of missions VANE_TIMED_OUT 34.7% of missions HUMIDITY_TIMED_OUT 34.2% of missions AMB_TEMP_TIMED_OUT 34.2% of missions

    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 imbalanced. Charging will be blocked until cell balancing completes.

    Troubleshooting Steps

    Section titled “Troubleshooting Steps”
    1 action
    Continue to fly as normal. The alarm should clear on its own.

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    Topic history
    1. 2026-10-07 Susan Minne Bulk/mechanical change
      Replace individual guide ownership with system technical contacts
      Commit dca5a1a
    2. 2026-09-24 Susan Minne Bulk/mechanical change
      chore: backfill aircraft owner identities batch 4
      Commit d9b2270
    3. 2026-09-23 Susan Minne Bulk/mechanical change
      docs: remove obsolete Confluence metadata
      Commit 2d5374e
    4. 2026-09-13 Susan Minne Bulk/mechanical change
      feat: add MX approval metadata to topics
      Commit 406a785
    5. 2026-06-12 Susan Minne Bulk/mechanical change
      Update troubleshooting topics and escalation paths
      Commit 166da10
    6. 2026-05-28 Susan Minne Bulk/mechanical change
      Remove redundant topic applicability banners
      Commit e561ad0
    7. 2026-05-11 Susan Minne Bulk/mechanical change
      Updated status from draft to published
      Commit d3897bf
    8. 2026-05-09 Susan Minne Bulk/mechanical change
      Populate owner fields from migrated content
      Commit 6b6d45f
    9. 2026-05-06 Gavin Edwards Bulk/mechanical change
      Remove redundant Engineer Owner table from topic body (#298)
      Commit 1619f07 PR #298
    10. 2026-05-05 Gavin Edwards Bulk/mechanical change
      Replace 10 deactivated-Atlassian-user-prefix references with "To be determined"
      Commit de3ded4
    11. 2026-05-04 Gavin Edwards Bulk/mechanical change
      Batch 7: 47 new topics from full 4-gate pipeline
      Commit e5e26ab
    12. 2026-04-20 Gavin Edwards Bulk/mechanical change
      Replace all topics with 17 v3-generated priority topics + component fixes
      Commit 2d64693
    13. 2026-04-15 Gavin Edwards Bulk/mechanical change
      Categorize 373 regenerated topics into subdirectories; drop 15 meta pages
      Commit 9bdc40f
    14. 2026-04-15 Gavin Edwards Bulk/mechanical change
      Replace topic corpus: 388 LLM-regenerated topics (round 1)
      Commit f950bfa
    15. 2026-04-14 Gavin Edwards Bulk/mechanical change
      Tag all 427 topics draft with DO NOT USE warning admonition
      Commit 1783498
    Baseline import
    Initial import into service_docs
    Imported by Gavin Edwards on 2026-04-10
    Fix 47 validation errors: question types, missing steps, invalid status/owner enums
    Commit 4183f19
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