# NTSB Incident CEN09IA172
> **CESSNA 150** · 2009-02-17 · Grayslake, IL, USA · NONE
## Event
- **NTSB number:** CEN09IA172
- **Event ID:** 20090223X50804
- **Type:** Incident
- **Date:** 2009-02-17
- **Location:** Grayslake, IL, USA
- **Coordinates:** 42.329723, -88.07917
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** CESSNA
- **Model:** 150
- **Registration:** N747KA
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure of the number 1 cylinder intake valve which resulted in a partial loss of engine power. Contributing to the incident was the failure of the operator to maintain the engine per manufacturer's recommendations.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN09IA172) · AI Analytics · CC0 1.0*