# Zipline Autonomy (Acoustic Detect-and-Avoid) revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Brain: [Zipline Autonomy (Acoustic Detect-and-Avoid)](/brains/zipline-autonomy.md)

## Recorded posture

- First recorded event: 2026-05-31
- Last material change: 2026-05-31
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-05-31**: created (source: baseline:arc-g)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /brains/zipline-autonomy/history. REST: /v1/brains/2d7dd907-313e-4ca7-bf76-84b8fea94e22/history. HTML: [/brains/zipline-autonomy/history](/brains/zipline-autonomy/history)._