# NTSB Incident ENG11IA032
> **DEHAVILLAND DHC-6-300** · 2011-05-21 · Peach Springs, AZ, USA · NONE
## Event
- **NTSB number:** ENG11IA032
- **Event ID:** 20110613X64905
- **Type:** Incident
- **Date:** 2011-05-21
- **Location:** Peach Springs, AZ, USA
- **Coordinates:** 35.197776, -114.054443
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 17
- **Total aboard:** 17
## Aircraft
- **Make:** DEHAVILLAND
- **Model:** DHC-6-300
- **Registration:** N178GC
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A quality control failure in the Sungear, Inc. manufacturing and quality control process allowed  sungears with surface finishes of the root fillet radius of the spline that did not conform to the drawing specifications to be released. The surface finish defect caused fatigue cracks to initiate early in the part life.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG11IA032) · AI Analytics · CC0 1.0*