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Zipline Zipline Service Documentation

    DIAG_COMMUNICATION_WARNING

    published Last Updated: Oct 9, 2026 HW: all
    Applicable alarms (1)
    DIAG_COMMUNICATION_WARNING
    Likely outcomes (1 missions, 2 issues) — click to expand

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

    Grounding vs discrepancy (of 2 ZERP issues filed on these missions)

    Grounding 0% (0 of 2 issues) Discrepancy 100% (2 of 2 issues)

    Frequently replaced parts

    Part P/N Removals
    PWR-DISTRO BOARD, ASSY, ZIP, P2 20817 5

    Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.

    Background

    Section titled “Background”

    This alarm sets when there is a single cycle of missing communication between the distro_a or droid_safety MCU and their attached squib controlling ASIC. This single cycle interruption has no impact on operation, and is only logged so the engineering design team can track the general performance of the communication link.

    Troubleshooting Steps

    Section titled “Troubleshooting Steps”
    1 action
    This alarm has no functional impact, and may be ignored by service and maintenance

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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. 2026-05-28 Susan Minne Bulk/mechanical change
      Remove redundant topic applicability banners
      Commit e561ad0
    6. 2026-05-10 Susan Minne Bulk/mechanical change
      Reviewed migrated topics. Edited as needed. Published.
      Commit 6199e3f
    7. 2026-05-06 Gavin Edwards Bulk/mechanical change
      Remove redundant Engineer Owner table from topic body (#298)
      Commit 1619f07 PR #298
    8. 2026-05-05 Gavin Edwards Bulk/mechanical change
      Prompt v2.2 + recover 107 demoted/false-abort topics
      Commit f7f27fe
    9. 2026-04-15 Gavin Edwards Bulk/mechanical change
      Replace topic corpus: 388 LLM-regenerated topics (round 1)
      Commit f950bfa
    10. 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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