# NTSB Accident MIA99TA206
> **Hughes OH-6A** · 1999-07-29 · Aguadilla, PR, USA · NONE
## Event
- **NTSB number:** MIA99TA206
- **Event ID:** 20040218X00198
- **Type:** Accident
- **Date:** 1999-07-29
- **Location:** Aguadilla, PR, USA
- **Coordinates:** 18.429414, -67.149688
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Hughes
- **Model:** OH-6A
- **Registration:** N66377
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

An unidentified foreign object passing through the oil cooler blower assembly resulting in fracture and seizure of the oil cooler blower, and slowing of the main transmission and main rotor, which resulted in the pilot being unable to arrest the descent during an autorotative landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=MIA99TA206) · AI Analytics · CC0 1.0*