# NTSB Incident DEN93IA044
> **BOEING 737-522** · 1993-04-24 · DENVER, CO, USA · NONE
## Event
- **NTSB number:** DEN93IA044
- **Event ID:** 20001211X12116
- **Type:** Incident
- **Date:** 1993-04-24
- **Location:** DENVER, CO, USA
- **Coordinates:** 39.759849, -104.919342
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 133
- **Total aboard:** 133
## Aircraft
- **Make:** BOEING
- **Model:** 737-522
- **Registration:** N905UA
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DUSK
- **Weather:** VMC
## Probable cause

THE PILOT-IN-COMMAND'S FAILURE TO MAINTAIN ADEQUATE SEPARATION FROM THE BOEING 757, AND HIS FAILURE TO STAY ABOVE THE PROBABLE PATH OF THE BOEING'S WAKE VORTICES, WHICH RESULTED IN THE VORTEX ENCOUNTER.  FACTORS RELATED TO THE ACCIDENT WERE: THE CROSSWIND, AND AN INADEQUACY IN ATC PROCEDURES CONCERNING VISUAL APPROACHES OF AIRCRAFT, BEHIND AND DOWNWIND FROM APPROACHES OF HEAVIER AIRCRAFT TO PARALLEL OR ADJACENT RUNWAYS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN93IA044) · MORVS · CC0 1.0*