Aviation Accident Summaries

Aviation Accident Summary ANC09LA012

Napaskiak, AK, USA

Aircraft #1

N36CF

CESSNA 207

Analysis

Prior to the accident flight, the operator reported that numerous flights from their base had been canceled or delayed due to poor weather earlier in the day. The weather improved in the afternoon, and the pilot departed on a commuter flight for his first destination, but did not land because of low visibility. The pilot continued to his second destination, and encountered light icing conditions while en route. After landing at his second stop, he deiced the airplane. The pilot then departed on the accident flight to return to his base, where the weather was reported as a ceiling of 500 feet overcast, with a visibility of 5 miles. After departure, the weather at the destination deteriorated, and the pilot decided to divert to an airport about 5 miles from his base. While maneuvering over the airport for landing, the pilot began a descending left turn toward the approach end of runway. The airplane stalled and mushed to the ground, about 250 feet short of the runway threshold. A postcrash fire erupted as the pilot and passenger were exiting the airplane. The pilot reported that when he arrived over the accident airport, the airplane had accumulated some ice, he was about 200 feet agl, and the visibility was about 1 mile. At the time of the accident, the destination airport was reporting, in part, a visibility of 3/4 statute mile in mist, 500 feet broken, with a temperature and dew point of 21 degrees F.

Factual Information

On November 14, 2008, about 1710 Alaska Standard time, a Cessna 207 airplane, N36CF, sustained substantial damage when it collided with terrain while maneuvering for landing at Napaskiak, Alaska. The airplane was then consumed by a postcrash fire. The airplane was being operated as Flight 555 by Flight Alaska, dba Yute Air Alaska, Anchorage, Alaska, as a visual flight rules (VFR) commuter flight under Title 14, CFR Part 135, when the accident occurred. The commercial pilot received minor injuries, and the sole passenger was not injured. Instrument meteorological conditions prevailed in the area of the accident, and VFR company flight following procedures were in effect. The flight originated at the Quinhagak Airport, Quinhagak, Alaska, about 1625, and was en route to Bethel, Alaska. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on November 17, the director of operations for the operator reported that numerous flights from Bethel had been canceled or delayed due to poor weather earlier in the day. The weather improved in the afternoon with a ceiling of about 1,500 feet, and a visibility of 7 miles, and the pilot departed Bethel at 1452 for his first destination, Eek, Alaska. After departure, the pilot decided not to land at his first destination because of low visibility, and continued to Quinhagak. The pilot encountered light icing conditions while en route, and deiced the airplane after landing at Quinhagak. The pilot departed Quinhagak with one passenger about 1625, and told the director of operations that the Bethel Airport was reporting a ceiling of 500 feet overcast, with a visibility of 5 miles. After departure, the weather at Bethel deteriorated, and the pilot decided to land at Napaskiak. While maneuvering over the Napaskiak Airport, the pilot began a descending left turn toward the approach end of runway 02. The airplane stalled and mushed to the ground, about 250 feet short of the runway threshold. It collided with tall brush and the ground, and a postcrash fire erupted as the pilot and passenger were exiting the airplane. During a telephone conversation with the NTSB IIC on November 17, the pilot reported that when he arrived over the airport at Napaskiak, he was about 200 feet agl, and the visibility was about 1 mile. He indicated that the airplane had accumulated some ice. He said he began a left turn for the runway, but the left wing stalled, and the airplane mushed into the ground. The closest weather reporting facility is Bethel, which is located about 5 miles northwest of the accident. At 1705, an aviation routine weather report (METAR) was reporting, in part: Wind, 190 degrees (true) at 8 knots; visibility, 3/4 statute mile in mist; clouds and sky condition, 500 feet broken, 1,600 feet broken, 2,900 feet overcast; temperature, 21 degrees F; dew point, 21 degrees F; altimeter, 29.79 inHg.

Probable Cause and Findings

The pilot's continued flight into adverse weather and icing conditions, and his failure to maintain sufficient airspeed to avoid a stall, resulting in a loss of control and in-flight collision with terrain while on an approach to land.

 

Source: NTSB Aviation Accident Database

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