Friday, February 23, 2018

Cessna 180, N2934A: Accident occurred February 17, 2018 in Big Lake, Alaska

Analysis

The pilot reported that, after landing on a snow-covered, off-airport landing site, he was positioning the airplane for parking. He added that the left ski broke through the ice, followed by the right ski. He reported that he had not seen the area of "soft/thin" ice before taxiing.

The airplane sustained substantial damage to the fuselage.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's selection of unsuitable terrain for landing, which led to both skis breaking through the ice while positioning the airplane after landing.

Findings

Personnel issues
Decision making/judgment - Pilot (Cause)
Monitoring environment - Pilot

Environmental issues
Snow/slush/ice covered surface - Decision related to condition (Cause)
Snow/slush/ice covered surface - Effect on operation

Factual Information

History of Flight

Taxi
Miscellaneous/other (Defining event)

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Anchorage, Alaska


Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Investigation Docket  - National Transportation Safety Board: https://dms.ntsb.gov/pubdms


http://registry.faa.gov/N2934A


Aviation Accident Factual Report - National Transportation Safety Board


Location: Big Lake, AK

Accident Number: GAA18CA136
Date & Time: 02/17/2018, 1230 AKD
Registration: N2934A
Aircraft: CESSNA 180
Aircraft Damage: Substantial
Defining Event: Miscellaneous/other
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal 

The pilot reported that, after landing on a snow covered
, off airport landing site, he was repositioning the airplane for parking. He added that the left ski broke through the ice, followed by the right ski. He reported that he had not seen the area of "soft/thin" ice before taxiing.


The airplane sustained substantial damage to the fuselage.


The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. 


Pilot Information


Certificate: Commercial

Age: 52, Male
Airplane Rating(s): Single-engine Land; Single-engine Sea
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 2 With Waivers/Limitations
Last FAA Medical Exam: 05/19/2017
Occupational Pilot: Yes
Last Flight Review or Equivalent: 07/12/2017
Flight Time:  (Estimated) 5344 hours (Total, all aircraft), 2172 hours (Total, this make and model), 5258 hours (Pilot In Command, all aircraft), 11 hours (Last 90 days, all aircraft), 4 hours (Last 30 days, all aircraft)

Aircraft and Owner/Operator Information


Aircraft Manufacturer: CESSNA

Registration: N2934A
Model/Series: 180 UNDESIGNATED
Aircraft Category: Airplane
Year of Manufacture: 1953
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 30134
Landing Gear Type: Retractable - Tailwheel
Seats: 4
Date/Type of Last Inspection: 04/12/2017, Annual
Certified Max Gross Wt.: 2550 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 3078.6 Hours at time of accident
Engine Manufacturer: CONT MOTOR
ELT: C126 installed, activated, aided in locating accident
Engine Model/Series: O-470-A
Registered Owner: On file
Rated Power: 225 hp
Operator: On file
Operating Certificate(s) Held: None 

Meteorological Information and Flight Plan


Conditions at Accident Site: Visual Conditions

Condition of Light: Day
Observation Facility, Elevation: PANC, 132 ft msl
Observation Time: 2053 UTC
Distance from Accident Site: 27 Nautical Miles
Direction from Accident Site: 156°
Lowest Cloud Condition: Few / 400 ft agl
Temperature/Dew Point: -9°C / -12°C
Lowest Ceiling:  Broken / 20000 ft agl
Visibility:  10 Miles
Wind Speed/Gusts, Direction: 3 knots, 40°
Visibility (RVR):
Altimeter Setting: 30.74 inches Hg
Visibility (RVV):
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point:  ANCHORAGE, AK (LHD)
Type of Flight Plan Filed: None
Destination: Big Lake, AK
Type of Clearance: None
Departure Time: 1130 AST
Type of Airspace: Class G 

Wreckage and Impact Information


Crew Injuries: 1 None

Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude:  61.580000, -150.410000 (est)

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