# NTSB Accident WPR15LA262
> **GRAVES BRYON S VANS RV-7A** · 2015-09-21 · Byron, CA, USA · NONE
## Event
- **NTSB number:** WPR15LA262
- **Event ID:** 20150921X31115
- **Type:** Accident
- **Date:** 2015-09-21
- **Location:** Byron, CA, USA
- **Coordinates:** 37.858333, -121.597778
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** GRAVES BRYON S
- **Model:** VANS RV-7A
- **Registration:** N507RV
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Improper overhaul of the right magneto, which eliminated system redundancy, and resulted in a loss of engine power when the left magneto failed during aerobatic flight maneuvers.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR15LA262) · AI Analytics · CC0 1.0*