# NTSB Accident MKC90DCQ02
> **BELL UH-1B** · 1990-05-06 · ULYSSES, KS, USA · FATL
## Event
- **NTSB number:** MKC90DCQ02
- **Event ID:** 20001212X23230
- **Type:** Accident
- **Date:** 1990-05-06
- **Location:** ULYSSES, KS, USA
- **Coordinates:** 37.570838, -101.349205
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** BELL
- **Model:** UH-1B
- **Registration:** N8142W
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE PILOT FAILED TO MAINTAIN PROPER ROTOR RPM, WHILE MANEUVERING OVER A HIGH OBSTRUCTION (POWER LINE) AT THE END OF A SWATH RUN, WHICH RESULTED IN AN INADVERTENT DESCENT & COLLISION WITH THE TERRAIN.  THE HIGH OBSTRUCTION WAS CONSIDERED TO BE 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=MKC90DCQ02) · AI Analytics · CC0 1.0*