# NTSB Incident DEN89IA089
> **BOEING 727-200A** · 1989-03-22 · SAN ANTONIO, TX, USA · NONE
## Event
- **NTSB number:** DEN89IA089
- **Event ID:** 20001213X27873
- **Type:** Incident
- **Date:** 1989-03-22
- **Location:** SAN ANTONIO, TX, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 261
- **Total aboard:** 261
## Aircraft
- **Make:** BOEING
- **Model:** 727-200A
- **Registration:** N728
- **FAR Part:** 121
- **Engines:** 3
- **Damage:** —
## Conditions
- **Light:** NDRK
- **Weather:** Unk
## Probable cause

FAILURE OF THE ARTCC CONTROLLER TO ASSURE THAT THE AIRCRAFT MAINTAINED IFR SEPARATION STANDARDS.  THE CONTROLLER'S HEAVY WORKLOAD WAS A RELATED FACTOR.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN89IA089) · AI Analytics · CC0 1.0*