Tuesday, April 10, 2018

Cessna 170, N4133V: Accident occurred April 09, 2018 at Big Lake Airport (PAGQ), Alaska

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/N4133V

Analysis 

The pilot reported that, during the approach to land on a gravel airstrip, he increased engine power to "extend the approach," the airplane pitched up in a nose-high attitude, aerodynamically stalled, and yawed to the right. Subsequently, the airplane impacted a snowbank to the right side of the airstrip. A postcrash fire destroyed the airplane.

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 exceedance of the airplane's critical angle of attack, which resulted in an aerodynamic stall. 

Findings

Aircraft
Angle of attack - Capability exceeded (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Snow/ice - Contributed to outcome

Factual Information

History of Flight

Approach
Loss of control in flight (Defining event)
Aerodynamic stall/spin

Landing-flare/touchdown
Runway excursion

Landing
Collision with terr/obj (non-CFIT)

Post-impact
Fire/smoke (post-impact)

Location: Big Lake, AK
Accident Number: GAA18CA214
Date & Time: 04/08/2018, 1930 AKD
Registration: N4133V
Aircraft: CESSNA 170
Aircraft Damage: Destroyed
Defining Event: Loss of control in flight
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Instructional 

The pilot reported that, during the approach to land on a gravel airstrip, he increased engine power to "extend the approach", the airplane pitched up in a nose high attitude, aerodynamically stalled and yawed to the right. Subsequently, the airplane impacted a snowbank to the right side of the airstrip. A postcrash fire destroyed the airplane.

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

Pilot Information

Certificate: Flight Instructor; Commercial
Age: 79, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land; Single-engine Sea
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: Unknown
Instrument Rating(s): Airplane
Second Pilot Present: Yes
Instructor Rating(s): Airplane Multi-engine; Airplane Single-engine; Instrument Airplane
Toxicology Performed: No
Medical Certification: Class 3 Without Waivers/Limitations
Last FAA Medical Exam: 01/01/2016
Occupational Pilot: Yes
Last Flight Review or Equivalent:
Flight Time:  (Estimated) 9000 hours (Total, all aircraft), 3 hours (Total, this make and model), 9000 hours (Pilot In Command, all aircraft), 6 hours (Last 90 days, all aircraft), 6 hours (Last 30 days, all aircraft), 3 hours (Last 24 hours, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Manufacturer: CESSNA
Registration: N4133V
Model/Series: 170 UNDESIGNATED
Aircraft Category: Airplane
Year of Manufacture: 1948
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 18465
Landing Gear Type: Tailwheel
Seats: 4
Date/Type of Last Inspection: 07/26/2017, Annual
Certified Max Gross Wt.: 2200 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 3483.5 Hours as of last inspection
Engine Manufacturer: CONT MOTOR
ELT: Installed, not activated
Engine Model/Series: C145 SERIES
Registered Owner: CHESTER A. GODIN
Rated Power: 145 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: PAWS, 354 ft msl
Observation Time: 0256 UTC
Distance from Accident Site: 9 Nautical Miles
Direction from Accident Site: 89°
Lowest Cloud Condition: Scattered / 10000 ft agl
Temperature/Dew Point: 9°C / -7°C
Lowest Ceiling:
Visibility:  10 Miles
Wind Speed/Gusts, Direction: 7 knots, 60°
Visibility (RVR):
Altimeter Setting: 29.71 inches Hg
Visibility (RVV):
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: BIG LAKE, AK (BGQ)
Type of Flight Plan Filed: None
Destination: Big Lake, AK
Type of Clearance: None
Departure Time: 1800 AKD
Type of Airspace:  Class G 

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Destroyed
Passenger Injuries: 1 None
Aircraft Fire: On-Ground
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude:  61.568889, -149.851111 (est)

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