# NTSB Accident CHI98LA339
> **Enstrom 480** · 1998-09-16 · GREEN BAY, WI, USA · NONE
## Event
- **NTSB number:** CHI98LA339
- **Event ID:** 20001211X11020
- **Type:** Accident
- **Date:** 1998-09-16
- **Location:** GREEN BAY, WI, USA
- **Coordinates:** 44.590663, -88.12091
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Enstrom
- **Model:** 480
- **Registration:** N142CC
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

the pilot's failure to maintain adequate rotor rpm during a practice autorotation.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI98LA339) · AI Analytics · CC0 1.0*