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Crash of a Cessna 550 Citation II in Fort Yukon

Date & Time: Sep 30, 2005 at 1210 LT
Type of aircraft:
Operator:
Registration:
N77ND
Flight Phase:
Survivors:
Yes
Schedule:
Fairbanks - Fairbanks
MSN:
550-0005
YOM:
1978
Crew on board:
2
Crew fatalities:
Pax on board:
2
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
3712
Captain / Total hours on type:
948.00
Copilot / Total flying hours:
5696
Copilot / Total hours on type:
141
Aircraft flight hours:
4262
Circumstances:
The flight crew, an airline transport certificated captain, and a commercial certificated co-pilot, were flying a restricted category, icing research equipped airplane in instrument meteorological icing conditions under Title 14, CFR Part 91. The purpose of the flight was to locate icing conditions for a prototype helicopter's in-flight icing tests. While in cruise flight, the airplane encountered icing conditions, and had accumulated about 1" of ice on the leading edges of the wings. The captain reported that he activated the wing deicing pneumatic boots, and the ice was shed from both wings. About 4 minutes after activating the deice boots, both engines simultaneously lost all power. The crew attempted several engine restarts, but were unsuccessful, and made a forced landing on frozen, snow-covered terrain. During the landing, the airplane struck several small, burned trees, and sustained substantial damage. The airplane's ice control system is comprised of two separate systems, one an anti-ice, the other, a deice. The majority of the wings' surfaces are deiced by pneumatic, inflating boots. The inboard section of the wings, directly in front of the engine air inlets, and the engine air inlets themselves, utilize a heated, anti-ice surface to preclude any ice accretion and potential for ice ingestion into the engines. The anti-ice system is not automatic, and must be activated by the flight crew prior to entering icing conditions. A researcher in the aft cabin photographed the airplane's wings before and after the activation of the deice boots. The photographs taken prior to the deice boot activation depicted about 1" of ice on the wings, as well as on the anti-ice (heated) inboard portion of the wings. The photographs taken after the deice boot activation revealed that the ice had been removed from the booted portion of the wings, but ice remained on the inboard, anti-ice segment. An engineer from the airplane's manufacturer said that if the anti-ice system was activated after ice had accumulated on the wings, it would take 2-4 minutes for the anti-ice portion of the wings and engine inlets to heat sufficiently to shed the ice. A postaccident inspection of the anti-ice components found no anomalies, and there was no record of any recent problems with the anti-ice system. The flight crew reported that the anti-ice activation switch is on the captain's side, and they could not recall if or when the anti-ice system was activated. They stated that they did not discuss its use, or use a checklist that addressed the use of the anti-ice system. A section of the airplane's flight manual states: "Failure to switch on the [anti-ice] system before ice accumulation has begun may result in engine damage due to ice ingestion." An inspection by an NTSB power plant engineer disclosed catastrophic engine damage consistent with ice ingestion.
Probable cause:
The pilot's improper use of anti-icing equipment during cruise flight, which resulted in ice ingestion into both engines (foreign object damage), the complete loss of engine power in both engines, and an emergency descent and landing on tree covered terrain. Factors associated with the accident were the icing conditions, inadequate crew resource management, and failure to use a checklist.
Final Report:

Crash of a Fairchild C-119G Flying Boxcar in Bettles

Date & Time: Jun 27, 1981 at 2215 LT
Operator:
Registration:
N8682
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Bettles - Fort Yukon
MSN:
10859
YOM:
1952
Flight number:
Tanker 138
Location:
Crew on board:
2
Crew fatalities:
Pax on board:
4
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
En route from Bettles to Fort Yukon on a fire fighting mission, the airplane was climbing when the right engine caught fire and exploded. The captain ordered the four passengers (firefighters) and the copilot to evacuate the cabin and the captain, sole on board, attempted an emergency landing on a sandbar located near the Kayokuk River. All six occupants were rescued while the aircraft was damaged beyond repair.
Probable cause:
Powerplant failure for undetermined reasons. The following contributing factors were reported:
- Fire in engine,
- Inadequate maintenance and inspection,
- Loose gravel,
- Sandy terrain,
- Forced landing off airport on land,
- Unknown intern fire in right engine,
- Unfeathered propeller.
Final Report:

Crash of a Lockheed PV-2T Harpoon in Fort Yukon: 1 killed

Date & Time: Aug 9, 1958
Type of aircraft:
Registration:
N7457C
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Aklavik – Fairbanks
MSN:
15-1594
YOM:
1945
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Circumstances:
The twin engine aircraft crashed in unknown circumstances in Fort Yukon. The copilot was killed while the captain was injured.