# NTSB Incident CHI96IA320
> **Cessna 525** · 1996-08-29 · MILWAUKEE, WI, USA · NONE
## Event
- **NTSB number:** CHI96IA320
- **Event ID:** 20001208X06434
- **Type:** Incident
- **Date:** 1996-08-29
- **Location:** MILWAUKEE, WI, USA
- **Coordinates:** 42.980503, -87.900192
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** Cessna
- **Model:** 525
- **Registration:** N123JN
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

an uncontained failure of a high pressure turbine disk blade retention post due to fatigue.  A factor relating to the incident was: inadequate design of the high pressure turbine disk.  Fretting on the leading side of the lobe near the fracture origin may have contributed to premature initiation of the fatigue.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI96IA320) · AI Analytics · CC0 1.0*