# NTSB Incident ATL89IA099
> **BOEING 737-201** · 1989-03-09 · DAYTON, OH, USA · NONE
## Event
- **NTSB number:** ATL89IA099
- **Event ID:** 20001213X27829
- **Type:** Incident
- **Date:** 1989-03-09
- **Location:** DAYTON, OH, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 82
- **Total aboard:** 82
## Aircraft
- **Make:** BOEING
- **Model:** 737-201
- **Registration:** N217US
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** Unk
## Probable cause

AN EXCESSIVELY WORN OUTFLOW VALVE IN THE CABIN EVIRONMENTAL/PRESSURIZATION SYSTEM THAT RESULTED IN A RAPID CABIN DEPRESSURIZATION.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ATL89IA099) · AI Analytics · CC0 1.0*