# NTSB Accident IAD97LA028
> **Hughes 269C** · 1996-12-04 · MAYFIELD, KY, USA · NONE
## Event
- **NTSB number:** IAD97LA028
- **Event ID:** 20001208X07174
- **Type:** Accident
- **Date:** 1996-12-04
- **Location:** MAYFIELD, KY, USA
- **Coordinates:** 36.730258, -88.639068
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Hughes
- **Model:** 269C
- **Registration:** N1105P
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

disengagement of the main transmission aft pinion nut, allowing the tail rotor splined drive sleeve to disengage from the pinion, which resulted in loss of directional control and an emergency (autorotative) landing.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=IAD97LA028) · AI Analytics · CC0 1.0*