No fatalities

21 Dec 2011: CESSNA 207A — Yute Air Alaska — Kwigillingok, AK

Kwigillingok, AK, United States

On 21 Dec 2011, a CESSNA 207A operated by Yute Air Alaska was involved in an aviation accident near Kwigillingok, AK. No fatalities were reported. Investigators recorded the probable cause as: The pilot’s decision to continue visual flight into instrument meteorological conditions with moderate icing, which resulted in structural icing and an aerodynamic stall. This summary draws on records from NTSB; 17 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 1778583330Data APIEditorial standards

A pilot flying in visual conditions inadvertently entered instrument conditions, leading to ice buildup on the airframe and a subsequent loss of airspeed, causing the airplane to descend and collide with terrain, resulting in substantial damage.

Overview

A pilot reported that while flying in visual meteorological conditions, an inadvertent entry into instrument meteorological conditions occurred. This transition resulted in the accumulation of ice on both the airframe and windscreen.

Sequence of Events

According to the pilot's account, the approach to the airport was conducted under visual conditions for the majority of the flight. However, upon nearing the airport, the aircraft entered an area of reduced visibility and cloud cover, consistent with instrument meteorological conditions. The pilot attempted to execute a 180-degree turn to exit the unfavorable conditions. During the maneuver, the aircraft was unable to maintain sufficient airspeed for flight, subsequently losing altitude and colliding with terrain.

Damage

The impact with terrain caused substantial damage to the fuselage, empennage, and wings of the airplane.

Pilot Report

The pilot stated that the flight was uneventful until the encounter with instrument conditions and ice buildup, which led to the loss of airspeed and the subsequent descent.

Contributing factors

Causes

Pilot

Other contributing factors

Attain/maintain not possibleEffect on equipment