# NTSB Incident ENG07IA034
> **LEARJET** · 2007-08-12 · Salt Lake City, UT, USA · NONE
## Event
- **NTSB number:** ENG07IA034
- **Event ID:** 20081219X65335
- **Type:** Incident
- **Date:** 2007-08-12
- **Location:** Salt Lake City, UT, USA
- **Coordinates:** 40.750682, -111.90065
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** LEARJET
- **Model:** —
- **Registration:** N244F
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** —
- **Weather:** —
## Probable cause

The fatigue fracture of the fan blade due to the blade vendor's improper setup of the forging dies, which resulted in fan blades with airfoils that were below the minimum thickness in the highest stressed area of the airfoil and resulted in operating stresses that exceeded the material's capability. Contributing to the incident was the engine manufacturer's lack of a dimensional inspection of the fan blade's airfoil.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG07IA034) · AI Analytics · CC0 1.0*