# NTSB Accident CHI91FA108
> **PIPER PA-30** · 1991-03-18 · THIEF RIVER FLS, MN, USA · FATL
## Event
- **NTSB number:** CHI91FA108
- **Event ID:** 20001212X16563
- **Type:** Accident
- **Date:** 1991-03-18
- **Location:** THIEF RIVER FLS, MN, USA
- **Coordinates:** 48.109626, -96.1707
## Injuries
- **Highest injury:** FATL
- **Fatal:** 4
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 4
## Aircraft
- **Make:** PIPER
- **Model:** PA-30
- **Registration:** N8290Y
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** NDRK
- **Weather:** IMC
## Probable cause

IMPROPER IFR PROCEDURE OF THE PILOT, WHILE INTERCEPTING THE ILS LOCALIZER, BY NOT MAINTIANING THE MINIMUM DESCENT ALTITUDE (MDA) FOR THAT SEGMENT OF THE APPROACH.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI91FA108) · AI Analytics · CC0 1.0*