DISTRO_B_POWER_STATUS_UNAVAILABLE

published Last Updated: Oct 9, 2026 HW: all

DISTRO_B_POWER_STATUS_UNAVAILABLE distro b power status unavailable distro-b-power-status-unavailable

Applicable alarms (1)

DISTRO_B_POWER_STATUS_UNAVAILABLE

Likely outcomes (59 missions, 20 issues) — click to expand

Based on 59 missions where this alarm fired in the last 90 days as of 2026-10-13

Grounding vs discrepancy (of 20 ZERP issues filed on these missions)

Grounding 15% (3 of 20 issues) Discrepancy 85% (17 of 20 issues)

Frequently replaced parts

Part	P/N	Removals
LEFT DOOR ASSY, DROID, P2	21830	18
RIGHT DOOR ASSY, DROID, P2	21827	18
PARALAND ASSY, DROID, P2	18427	14
BATTERY, DROID, P2	24544	12
BRAIN, LRU, DROID, P2	31920	10

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

Background

This alarm occurs when Zip Exec has not received a power status reported by Distro B within the watchdog timeout. Often this alarm is caused by Distro B crashing, running at too slow of a rate, or publishing power status too infrequently.

This alarm can also be caused by compute performance, compute bridge, and IPC issues (these cases often see multiple watchdog alarms).

Exec watchdog alarm

• DISTRO_B_POWER_STATUS_UNAVAILABLE

Troubleshooting Steps

Show Troubleshooting Flow

1 escalation Copy link

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 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. 2026-05-19 Richard Baverstock Bulk/mechanical change
   Migrate watchdog docs to Exec alarm guides
   Commit 96479ac
8. 2026-05-10 Susan Minne Bulk/mechanical change
   Reviewed migrated topics. Edited as needed. Published.
   Commit 6199e3f
9. 2026-05-09 Susan Minne Bulk/mechanical change
   Populate owner fields from migrated content
   Commit 6b6d45f
10. 2026-05-06 Gavin Edwards Bulk/mechanical change
    Remove redundant Engineer Owner table from topic body (#298)
    Commit 1619f07 PR #298
11. 2026-05-05 Gavin Edwards Bulk/mechanical change
    Replace 10 deactivated-Atlassian-user-prefix references with "To be determined"
    Commit de3ded4
12. 2026-05-04 Gavin Edwards Bulk/mechanical change
    Add 23 new topics (batch 5) + path-prop fixes on 33 existing topics
    Commit 05b76c0
13. 2026-04-23 Gavin Edwards Bulk/mechanical change
    Replace all topics with 210 v3-generated baseline content
    Commit 9b61a6e
14. 2026-04-15 Gavin Edwards Bulk/mechanical change
    Categorize 373 regenerated topics into subdirectories; drop 15 meta pages
    Commit 9bdc40f
15. 2026-04-15 Gavin Edwards Bulk/mechanical change
    Replace topic corpus: 388 LLM-regenerated topics (round 1)
    Commit f950bfa
16. 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 4 batch 4)

Commit df085ac

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