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Atlas / NTSB / ANC02LA123

NTSB CAROL · Event

Event ANC02LA123

2002-09-20 Bethel, Alaska, United States None 1 aircraft Status: Completed

Registry · N144Q

FAA Aircraft Registry record.

Make / Model

DEHAVILLAND BEAVER DHC-2 MK.1

Year of manufacture

1961 · 41 years old at event

Engine

P&W R-985 SERIES (450 hp)

Seats / Engines

8 seats · 1 engine

Last airworthiness date

20200901

ADS-B equipped

Yes — Mode-S A0B2EA

Registrant of record

RPL AIRCRAFT LEASING LLC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The instructor pilot's inadequate preflight by his failure to remove all frost from the wings prior to takeoff, which resulted in an inadvertent stall and in-flight collision with terrain.

Factual narrative

On September 20, 2002, about 0815 Alaska daylight time, a float-equipped de Havilland DHC-2 airplane, N144Q, sustained substantial damage during an in-flight collision with tundra-covered terrain during takeoff from a remote lake, located about 1 mile north of Bethel, Alaska. The airplane was being operated as a visual flight rules (VFR) local area instructional flight under Title 14, CFR Part 91, when the accident occurred. The airplane was being operated by Ptarmigan Air, Anchorage, Alaska. The first pilot, an airline transport certificated pilot/certificated flight instructor, seated in the right seat, and the second pilot, a commercial certificated pilot, seated in the left seat, were not injured. Visual meteorological conditions prevailed, and VFR company flight following procedures were in effect. The flight originated at the accident lake, about 0810. During a telephone conversation with a National Transportation Safety Board investigator on September 20, the first pilot reported that he was providing flight instruction/familiarization training to the second pilot. The first pilot said that just after takeoff, as the airplane climbed to about 50 feet above the water, the airplane began to buffet, and the right wing dropped. The airplane descended and subsequently struck an area of tundra-covered marshy terrain. The airplane sustained substantial damage to the wings, fuselage, and empennage. The first pilot reported that the accident flight was the first flight of the day. He added that a postaccident inspection of the airplane revealed an accumulation of frost on the wings. The certificated flight instructor, seated in the right seat, reported that he was providing flight instruction/familiarization training a commercial pilot, seated in the left seat, in a float-equipped airplane. The instructor added that the accident flight was the first flight of the day. He said that just after takeoff, as the airplane climbed to about 50 feet above the water, the airplane began to buffet, and the right wing dropped. The airplane descended and subsequently struck an area of tundra-covered marshy terrain. The airplane sustained substantial damage to the wings, fuselage, and empennage. The instructor reported that a postaccident inspection of the airplane revealed an accumulation of frost on the wings. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_2002_ANC02LA123.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

What the literature says.

Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.

Browse the full corpus — academia portal ↗