# NTSB Incident DEN90IA016
> **BOEING 737-322** · 1989-10-27 · RAPID CITY, SD, USA · NONE
## Event
- **NTSB number:** DEN90IA016
- **Event ID:** 20001213X29582
- **Type:** Incident
- **Date:** 1989-10-27
- **Location:** RAPID CITY, SD, USA
- **Coordinates:** 44.049865, -103.420616
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 40
- **Total aboard:** 40
## Aircraft
- **Make:** BOEING
- **Model:** 737-322
- **Registration:** N344UA
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE INFLIGHT FAILURE OF THE RECIRCULATING FAN UNIT AND SEVERAL AIR DUCT TEMPERATURE LIMITING SENSORS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN90IA016) · AI Analytics · CC0 1.0*