# Firebolt: Major incident: Engines may fail to start and stop

**Summary:** Firebolt reported a major incident in which engines could fail to start and stop in AWS us-east-1, starting 2021-12-07 15:58 UTC and lasting 15 h 59 min. Firebolt attributed it to partial AWS issues; the incident was resolved at 2021-12-08 07:57 UTC, with engines fully operational. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2021-12-07 15:58 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/spjqn4myg8md](https://stspg.io/spjqn4myg8md)
- [Company: Firebolt](https://rewindex.com/company/firebolt.md)
- Versions: before (none: first archived) → after incident\_version:147/781z5t8pk7lz@7fc2d79ec394
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Engines may fail to start and stop
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2021-12-07 15:58 UTC
```

**5. Added: Resolved time**

```diff
+ 2021-12-08 07:57 UTC
```

**6. Added: Affected components**

```diff
+ AWS - AWS ec2-us-east-1, AWS ec2-us-east-1, Engines, Firebolt Components - Engines
```

**7. Added: Update** (investigating) · 2021-12-07 15:58 UTC

```diff
+ Engines may fail to start and stop due to partial issues on AWS us-east-1 region.
```

**8. Added: Update** (investigating) · 2021-12-07 15:59 UTC

```diff
+ We are continuing to investigate this issue.
```

**9. Added: Update** (identified) · 2021-12-07 16:57 UTC

```diff
+ The issue has been identified on AWS side. Waiting for recovery.
```

**10. Added: Update** (resolved) · 2021-12-08 07:57 UTC

```diff
+ The incident has been resolved. Engines are fully operational.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2021-12-07 15:58 UTC | Major incident: Engines may fail to start and stop (this change) | outage |

All Firebolt changes: [timeline](https://rewindex.com/company/firebolt/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i18a91e433769ed · Markdown: https://rewindex.com/change/i18a91e433769ed.md · JSON: https://rewindex.com/api/v1/changes/i18a91e433769ed · Generated 2026-10-18T02:54:53.534Z