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Zipline Zipline Service Documentation

    SW_BRICK_UNDERVOLTAGE_WARNING

    published Last Updated: Oct 9, 2026 HW: all
    Applicable alarms (1)
    SW_BRICK_UNDERVOLTAGE_WARNING
    Likely outcomes (25 missions, 34 issues) — 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 34 ZERP issues filed on these missions)

    Grounding 17.6% (6 of 34 issues) Discrepancy 82.4% (28 of 34 issues)

    Frequently replaced parts

    Part P/N Removals
    BATTERY ASSY, ZIP, P2 27158 84
    TAIL ASM, PORT(LH), 3D PRINT PART, GNSS WITH LONG ENGAGMENT, ZIP, P2 0108336 20
    TAIL ASM, STRBRD(RH), IM GNSS, ZIP, P2 0108359 20
    CCW HOVER MOTOR ASSY, ZIP, P2 19607 12
    BATTERY, DROID, P2 24544 12

    Frequently co-occurring alarms (% of the 25 missions above)

    SW_PACK_UNDERVOLTAGE_WARNING 100% of missions CHARGE_OVERTEMPERATURE 96% of missions BATTERY_UNSAFE_TO_CHARGE 96% of missions SW_BRICK_IMBALANCE_WARNING 60% of missions MAINTENANCE_ACTION_REQUIRED 44% 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 at least one of the Aircraft battery bricks has a low voltage. Flight will be blocked until the battery charges.

    Troubleshooting Steps

    Section titled “Troubleshooting Steps”
    1 action
    Wait for the Aircraft battery to charge. If the battery does not begin charging within 10 minutes, escalate to P2 Firmware Power On Call.

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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 8: 26 new topics — last from impact-ranked pool
      Commit ad9327f
    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
    Import TG202615 aircraft topics (final batch 2)
    Commit 80eff14
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