# NTSB Accident SEA91LA154
> **JERRELL RV-4** · 1991-07-04 · YELLOWSTONEPARK, WY, USA · FATL
## Event
- **NTSB number:** SEA91LA154
- **Event ID:** 20001212X17699
- **Type:** Accident
- **Date:** 1991-07-04
- **Location:** YELLOWSTONEPARK, WY, USA
- **Coordinates:** 44.570365, -110.509788
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** JERRELL
- **Model:** RV-4
- **Registration:** N44AZ
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A COLLAPSED INDUCTION AIR DUCT.  FACTORS INCLUDE INADEQUATE DESIGN BY THE MANUFACTURER/BUILDER, AND A MISJUDGED RATE OF DESCENT BY THE PILOT.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA91LA154) · AI Analytics · CC0 1.0*