Incident Overview

Date: Thursday 8 February 2007
Aircraft Type: Cessna 208B Grand Caravan
Owner/operator: Suburban Air Freight
Registration Number: N1116Y
Location: 8 km NW of Alliance Airport, NE (AIA) – ÿ United States of America
Phase of Flight: Approach
Status: Destroyed, written off
Casualties: Fatalities: 0 / Occupants: 1
Component Affected: Aircraft Flight Control System (specifically, descent control)Aircraft Flight Control System (specifically, descent control)
Investigating Agency: NTSBNTSB
Category: Accident
A suburban Air Freight flight 22 experienced a near-miss incident due to a pilot’s deviation from standard procedures during a non-scheduled domestic cargo flight to Scottsbluff, Nebraska. The pilot elected to fly to Alliance Airport, instead of his usual destination, Alliance Airport, NE, due to a precision instrument approach facility at Scottsbluff. The pilot initiated a nonprecision approach to Scottsbluff, utilizing both VOR and NDB guidance. However, the NDB approach was reported as out of service, with a radio signal originating from the navigation aid. Radar data confirmed the flight path aligned with the NDB approach, despite instrumentation indicating a non-NDB approach. The airport’s weather conditions ? 1.25 miles visibility with a 200-foot overcast ? and minimum NDB approach altitude of 652 feet were factors contributing to the incident. The aircraft crashed into a pole and a building.A suburban Air Freight flight 22 experienced a near-miss incident due to a pilot’s deviation from standard procedures during a non-scheduled domestic cargo flight to Scottsbluff, Nebraska. The pilot elected to fly to Alliance Airport, instead of his usual destination, Alliance Airport, NE, due to a precision instrument approach facility at Scottsbluff. The pilot initiated a nonprecision approach to Scottsbluff, utilizing both VOR and NDB guidance. However, the NDB approach was reported as out of service, with a radio signal originating from the navigation aid. Radar data confirmed the flight path aligned with the NDB approach, despite instrumentation indicating a non-NDB approach. The airport’s weather conditions ? 1.25 miles visibility with a 200-foot overcast ? and minimum NDB approach altitude of 652 feet were factors contributing to the incident. The aircraft crashed into a pole and a building.

Description

Suburban Air Freight flight 22 departed Omaha-Eppley (OMA) at 23:45 for a non-scheduled domestic cargo flight to Scottsbluff (BFF). The pilot was dispatched to Scottsbluff instead of his usual destination, Alliance Airport, NE (AIA) because Scottsbluff had a precision instrument approach, while Alliance Airport did not. The pilot elected to fly to his usual airport, and attempted a nonprecision instrument approach. The airport had both a VOR and an NDB approach. The NDB approach was noted as being out of service, although there was still a radio signal coming from the navigation aid. The pilot was cleared for the VOR approach, although instrumentation inside the cockpit was found set for the NDB approach, and radar track data disclosed that the flight path was consistent with the NDB approach path, not the VOR’s. The airport’s reported weather was 1.25 miles visibility, with a 200-foot overcast in mist. The airport’s minimum NDB approach altitude is 652 feet above touchdown height. The airplane did not reach the runway, and collided with a pole and a building. PROBABLE CAUSE: “The pilot’s descent below minimum descent altitude while on a nonprecision approach. A contributing factor was a low ceiling.”

Primary Cause

Pilot’s descent below minimum descent altitude while on a nonprecision approach, compounded by a low ceiling.Pilot’s descent below minimum descent altitude while on a nonprecision approach, compounded by a low ceiling.

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