# NTSB Accident LAX91LA377
> **KAMAN HH43 B/F** · 1991-08-31 · COLEVILLE, CA, USA · FATL
## Event
- **NTSB number:** LAX91LA377
- **Event ID:** 20001212X17917
- **Type:** Accident
- **Date:** 1991-08-31
- **Location:** COLEVILLE, CA, USA
- **Coordinates:** 38.469459, -119.480194
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** KAMAN
- **Model:** HH43 B/F
- **Registration:** N53RH
- **FAR Part:** 133
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE FAILURE OF THE PILOT TO ADEQUATELY CALCULATE THE HELICOPTER PERFORMANCE.  CONTRIBUTING TO THE ACCIDENT WAS A DELAY IN JETTISONING THE EXTERNAL LOAD; THE PILOT'S OVERCONFIDENCE IN HIS ABILITIES; AND EXCEEDING OF THE HELICOPTER'S HOVER ABILITY DURING HIGH DENSITY ALTITUDE CONDITIONS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA377) · AI Analytics · CC0 1.0*