# NTSB Accident LAX99FA136
> **Bell 206B** · 1999-04-01 · GRAND CANYON, AZ, USA · FATL
## Event
- **NTSB number:** LAX99FA136
- **Event ID:** 20001205X00484
- **Type:** Accident
- **Date:** 1999-04-01
- **Location:** GRAND CANYON, AZ, USA
- **Coordinates:** 36.030826, -112.019752
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** Bell
- **Model:** 206B
- **Registration:** N992UC
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure of the flight crew to properly preflight the helicopter and to detect and remove accumulated snow from the engine inlets and plenum chamber.  Factors in the accident were the clouded plenum chamber inspection window and the failure of preceding flight crew to install the engine inlet covers in accordance with the operator's procedure.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX99FA136) · AI Analytics · CC0 1.0*