# NTSB Accident LAX91LA129
> **CESSNA 421B** · 1991-03-12 · TUCSON, AZ, USA · SERS
## Event
- **NTSB number:** LAX91LA129
- **Event ID:** 20001212X16630
- **Type:** Accident
- **Date:** 1991-03-12
- **Location:** TUCSON, AZ, USA
- **Coordinates:** 32.150413, -110.930671
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 3
- **Minor:** 3
- **Uninjured:** 0
- **Total aboard:** 6
## Aircraft
- **Make:** CESSNA
- **Model:** 421B
- **Registration:** N924MD
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DUSK
- **Weather:** VMC
## Probable cause

THE FATIGUE FAILURE OF THE RIGHT ENGINE TURBO EXHAUST CLAMP, AND, THE FAILURE OF THE FLYING PILOT TO COMPLETE THE SINGLE ENGINE EMERGENCY PROCEDURES IN A TIMELY MANNER.  A FACTOR IN THE ACCIDENT WAS THE FAILURE OF THE PILOT IN COMMAND TO ADEQUATELY SUPERVISE THE CONDUCT OF THE FLIGHT.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA129) · AI Analytics · CC0 1.0*