# NTSB Accident LAX99LA248
> **Piper PA-24-180** · 1999-07-10 · SAN LUIS OBISPO, CA, USA · NONE
## Event
- **NTSB number:** LAX99LA248
- **Event ID:** 20001212X19299
- **Type:** Accident
- **Date:** 1999-07-10
- **Location:** SAN LUIS OBISPO, CA, USA
- **Coordinates:** 35.250976, -120.620239
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Piper
- **Model:** PA-24-180
- **Registration:** N6597P
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure/separation of the crankshaft idler gear and the fatigue failure and subsequent separation of the crankshaft dowel pin due to the improper static and dynamic balance of the propeller by maintenance personnel.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX99LA248) · AI Analytics · CC0 1.0*