# NTSB Accident CHI99FA163
> **Cessna 421B** · 1999-05-27 · JEFFERSON CITY, MO, USA · FATL
## Event
- **NTSB number:** CHI99FA163
- **Event ID:** 20001212X18707
- **Type:** Accident
- **Date:** 1999-05-27
- **Location:** JEFFERSON CITY, MO, USA
## Injuries
- **Highest injury:** FATL
- **Fatal:** 4
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 4
## Aircraft
- **Make:** Cessna
- **Model:** 421B
- **Registration:** N34TM
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

the pilot failed to maintain control of the airplane.  A factor was the partial loss of power due to the exhaust valve fatigue failure.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI99FA163) · AI Analytics · CC0 1.0*