# NTSB Accident MIA97LA123
> **Cumberland SKYBOLT** · 1997-04-08 · SMITHFIELD, NC, USA · NONE
## Event
- **NTSB number:** MIA97LA123
- **Event ID:** 20001208X07779
- **Type:** Accident
- **Date:** 1997-04-08
- **Location:** SMITHFIELD, NC, USA
- **Coordinates:** 35.499839, -78.340515
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Cumberland
- **Model:** SKYBOLT
- **Registration:** N4TZ
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Installation by a student mechanic of a counterweight retaining washer that did not meet engine manufacturers specifications resulting in partial separation of the counterweight, failure of the No.5 connecting rod adjacent to the counterweight, and seizure of the engine. Contributing to the accident was improper supervision of the student mechanic by aviation school personnel.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=MIA97LA123) · AI Analytics · CC0 1.0*