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Zipline Zipline Service Documentation

    CONTROLLER_RAN_OUT_OF_SPLINE

    published Last Updated: Oct 9, 2026 HW: all
    Applicable alarms (1)
    CONTROLLER_RAN_OUT_OF_SPLINE
    Likely outcomes (4,875 missions, 62 issues) — click to expand

    Based on 4,875 missions where this alarm fired in the last 90 days as of 2026-10-13

    Grounding vs discrepancy (of 62 ZERP issues filed on these missions)

    Grounding 45.2% (28 of 62 issues) Discrepancy 54.8% (34 of 62 issues)

    Frequently replaced parts

    Part P/N Removals
    ASSY, SPOOL AND LINE, DOCKING FIN 48477 35
    SERVO, ASSY, UNIVERSAL, P2 20398 11
    DOCKING FIN WINCH ASSY, ZIP, P2 24084 11
    DISTRO ASSY, ZIP, P2 0109371 6

    Frequently co-occurring alarms (% of the 4,875 missions above)

    ADSB_NOT_READY 96.2% of missions STALE_CYCLE_METRICS_RECORD 42.5% of missions DIFFERENTIAL_PRESSURE_INPUT_TIMED_OUT 22.3% of missions ABSOLUTE_PRESSURE_INPUT_TIMED_OUT 22.2% of missions RELATIVE_HUMIDITY_INPUT_TIMED_OUT 20.9% of missions

    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 gnc zip controller has run out of a motion planner spline to follow.

    This is a software issue, if it occurs in flight the aircraft will paraland.

    Troubleshooting Steps

    Section titled “Troubleshooting Steps”
    1 escalation
    Escalate to P2 Zip Autonomy 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 2
      Commit 6ca6807
    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. 2026-05-10 Susan Minne Bulk/mechanical change
      Reviewed migrated topics. Edited as needed. Published.
      Commit 6199e3f
    8. 2026-05-06 Gavin Edwards Bulk/mechanical change
      Remove redundant Engineer Owner table from topic body (#298)
      Commit 1619f07 PR #298
    9. 2026-05-04 Gavin Edwards Bulk/mechanical change
      Add 23 new topics (batch 5) + path-prop fixes on 33 existing topics
      Commit 05b76c0
    10. 2026-04-23 Gavin Edwards Bulk/mechanical change
      Replace all topics with 210 v3-generated baseline content
      Commit 9b61a6e
    11. 2026-04-15 Gavin Edwards Bulk/mechanical change
      Categorize 373 regenerated topics into subdirectories; drop 15 meta pages
      Commit 9bdc40f
    12. 2026-04-15 Gavin Edwards Bulk/mechanical change
      Replace topic corpus: 388 LLM-regenerated topics (round 1)
      Commit f950bfa
    13. 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 (chunk 1 batch 1)
    Commit ffe7d55
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