# NTSB Accident CHI04CA237
> **Enstrom F-28A** · 2004-08-23 · Leroy, MN, USA · SERS
## Event
- **NTSB number:** CHI04CA237
- **Event ID:** 20040913X01409
- **Type:** Accident
- **Date:** 2004-08-23
- **Location:** Leroy, MN, USA
- **Coordinates:** 43.8875, -92.843055
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** Enstrom
- **Model:** F-28A
- **Registration:** N9573
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The partial loss of engine power due to the missing 1/8-27 NPT Allen plug as a result of other maintenance personnel undertorquing the plug.  Additionally, the pilot improperly excecuted a run on landing.  A factor was the loss of tail rotor effectiveness.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI04CA237) · AI Analytics · CC0 1.0*