ASN Wikibase Occurrence # 193999
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| Date: | Sunday 5 March 2017 |
| Time: | 22:23 |
| Type: |  Cessna R172K Hawk XP |
| Owner/operator: | Private |
| Registration: | N736AS |
| MSN: | R1722378 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 2102 hours |
| Engine model: | Continental IO-360-K |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hastings Creek, east of Nome, AK -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Wasilla Airport, AK (WWA/PAWS) |
| Nome, AK (94Z) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot was conducting a cross-county flight from Wasilla to Nome, Alaska, at night. According to GPS data, the airplane departed at 1710 and crashed at 2223. The pilot's third-class medical certificate had the limitation "not valid for night flying," but meteorological information for Nome indicated that the end of civil twilight occurred at 2022. Thus, the pilot's operation of the flight after 2022 was not in compliance with his medical certification. The pilot was also not in compliance with the requirement in Title 14 Code of Federal Regulations 91.409(a) for airplanes operating under Part 91 to have annual inspections.
The pilot dispensed 35 gallons of fuel into the airplane and fuel containers before the flight. The fuel quantity in the fuel tanks before the flight is unknown. According to the airplane manufacturer's performance charts, if the airplane was filled to the maximum capacity of 52 gallons, it would have had a no-wind range of 505 to 545 nm with 5 gallons of reserve fuel, depending on the engine and propeller settings. The GPS data indicated that the airplane flew a total distance of 518 nm from the taxi to the accident time, which was above the minimum range.
The destination weather forecast product that was available before the flight indicated ceilings as low as 1,500 ft and visibility 4 miles in light snow and mist. The updated forecast that was published during the flight and was valid at the time of the accident indicated a ceiling of 500 ft and visibility of 1 ½ miles. No evidence indicated that the pilot obtained weather forecast information before or during the flight. About 45 minutes before the pilot's expected arrival, a friend at the destination told the pilot that the ceiling was 600 ft in fog, which was below visual flight rules weather. The pilot's text messages revealed that he would continue to the destination because he thought that he could "sneak in." However, the pilot did not have an instrument rating.
Witness statements and an automated weather recording revealed a low ceiling in fog at the time that the airplane arrived in the terminal area. The pilot attempted to land four times but was unable to see the unlit runway through the fog, so the pilot departed the terminal area. A larger, plowed, and well-lit airport was 1 mile away and would have been an appropriate destination for a night flight in a wheel-equipped airplane. Although the specific reasons why the pilot was determined to land at the small, dark, snow-covered destination airport are not known, it is possible that the pilot wanted to avoid detection because of the packaged marijuana that was found in the airplane wreckage.
GPS data indicated that, 8 minutes after departing the terminal area, the airplane slowed to a groundspeed of 35 knots (well below the 54-knot stall speed) at an altitude of 373 ft, and the airplane crashed about 1 minute later. An examination of the wreckage revealed that the airplane impacted sea ice in a nose-down spin, resulting in extensive wing leading edge crush damage, which was consistent with an aerodynamic stall at a low altitude and a loss of control.
The fuel tanks had no quantifiable fuel, and the propeller blades lacked chordwise scratches or torsional deformation, which were consistent with an impact due to a loss of engine power after fuel exhaustion. A forced emergency landing on the sea ice would have been possible had the pilot maintained glide speed after the loss of engine power. Also, a suitable airport with good weather conditions was located 60 nm northeast of the destination. Had the pilot elected to divert to that airport before attempting visual approaches in instrument meteorological conditions, the airplane might have had enough fuel to land at that airport.
Probable Cause: The pilot's improper decision to conduct multiple visual approaches to the destination airport despite the night instrument meteorological conditions; the airplane's low fuel state at that time, which resulted in a total loss of engine power due to fuel exhaustion; and the pilot's subsequent failure to maintain adequate airspeed, which led to an aerodynamic stall and a loss of control. Contributing to the accident was the pilot's operation of the flight with a medical certification limitation that precluded him from night flying.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=736AS
Location
Images:
Photo: NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2017 05:22 | Geno | Added |
| 02-Mar-2019 14:45 | ASN Update Bot | Updated [Time, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
| 02-Mar-2019 15:37 | harro | Updated [Departure airport, Source, Narrative, Photo] |
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