# NTSB Incident ANC09IA015
> **BOEING 737-4Q8** · 2008-12-20 · Sitka, AK, USA · MINR
## Event
- **NTSB number:** ANC09IA015
- **Event ID:** 20081223X70710
- **Type:** Incident
- **Date:** 2008-12-20
- **Location:** Sitka, AK, USA
- **Coordinates:** 57.047222, -135.361663
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 88
- **Uninjured:** 0
- **Total aboard:** 88
## Aircraft
- **Make:** BOEING
- **Model:** 737-4Q8
- **Registration:** N771AS
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

The placement of operating equipment in close proximity to an external heating unit's intake by ground personnel, resulting in the contamination of the airplane's cabin with carbon monoxide.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC09IA015) · AI Analytics · CC0 1.0*