# NTSB Accident IAD01LA031
> **Enstrom F28A** · 2001-02-03 · Napoleon, OH, USA · NONE
## Event
- **NTSB number:** IAD01LA031
- **Event ID:** 20010212X00436
- **Type:** Accident
- **Date:** 2001-02-03
- **Location:** Napoleon, OH, USA
- **Coordinates:** 41.374168, -84.067779
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** Enstrom
- **Model:** F28A
- **Registration:** N98PM
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The fatigue failure in the fillet radius of the mast, which resulted in the separation of the main rotor system.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=IAD01LA031) · AI Analytics · CC0 1.0*