Wednesday, April 4, 2018

Aviat A-1B, N335SB, registered to and operated by Park County Sheriff's Office: Accident occurred August 27, 2017 at Yellowstone Regional Airport (KCOD), Cody, Park County, Wyoming

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Casper, Wyoming

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/N335SB





National Transportation Safety Board - Aviation Accident Factual Report

Location: Cody, WY
Accident Number: GAA17CA512
Date & Time: 08/27/2017, 1700 MST
Registration: N335SB
Aircraft: AVIAT AIRCRAFT INC A 1
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted Under: Public Aircraft 

Analysis 

According to the pilot in the tailwheel-equipped airplane, he landed on the asphalt surface of runway 4 with full flaps and about 40 knots airspeed. The pilot reported that, during the landing roll, a wind gust struck the airplane's left side, the airplane ground looped to the left, and the right-wing strut collided with the 7,000-ft runway distance marker.

The airplane sustained substantial damage to the right-wing strut and the wing spar.

The METAR at the accident airport reported that, about the time of the accident, the wind was from 020° at 9 knots. No wind gusts were reported at the time of the accident.

The pilot reported that there were no preaccident mechanical malfunctions or failures 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 failure to maintain directional control during the landing roll.

Findings

Aircraft
Directional control - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Factual Information

History of Flight

Landing-landing roll
Other weather encounter
Loss of control on ground (Defining event)
Runway excursion
Collision with terr/obj (non-CFIT)

According to the pilot in the tailwheel-equipped airplane, he landed on the asphalt surface of runway 4 with full flaps and about 40 knots airspeed.

During the landing roll, a wind gust struck the left side of the airplane, and the airplane ground-looped to the left, and the right-wing strut collided with the 7,000ft runway distance marker.

The airplane sustained substantial damage to the right-wing strut and the wing spar.

The METAR at the accident airport reported that about the time of the accident, the wind was from 020° at 9kts. No wind gusts were reported at the time of the accident.

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

Pilot Information

Certificate: Commercial
Age: 83, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land; Single-engine Sea
Seat Occupied: Unknown
Other Aircraft Rating(s): None
Restraint Used: Unknown
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: 01/31/2018
Occupational Pilot: No
Last Flight Review or Equivalent: 09/19/2017
Flight Time:  14777 hours (Total, all aircraft), 610 hours (Total, this make and model), 22 hours (Last 90 days, all aircraft), 5 hours (Last 30 days, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Manufacturer: AVIAT AIRCRAFT INC
Registration: N335SB
Model/Series: A 1 B
Aircraft Category: Airplane
Year of Manufacture: 2000
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 2090
Landing Gear Type: Tailwheel
Seats: 1
Date/Type of Last Inspection:  04/01/2017, Annual
Certified Max Gross Wt.: 2200 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 610 Hours at time of accident
Engine Manufacturer: Lycoming
ELT: Installed, not activated
Engine Model/Series: O-360
Registered Owner: PARK COUNTY SHERIFF'S OFFICE
Rated Power: 180 hp
Operator: PARK COUNTY SHERIFF'S OFFICE
Operating Certificate(s) Held: None 

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Dusk
Observation Facility, Elevation: KCOD, 5092 ft msl
Observation Time: 2256 UTC
Distance from Accident Site: 0 Nautical Miles
Direction from Accident Site: 124°
Lowest Cloud Condition: Clear
Temperature/Dew Point: 28°C / 6°C
Lowest Ceiling: None
Visibility:  10 Miles
Wind Speed/Gusts, Direction: 9 knots, 20°
Visibility (RVR):
Altimeter Setting: 30.23 inches Hg
Visibility (RVV):
Precipitation and Obscuration:  No Obscuration; No Precipitation
Departure Point: Cody, WY (COD)
Type of Flight Plan Filed: None
Destination:  Cody, WY (COD)
Type of Clearance: None
Departure Time: 1530 MDT
Type of Airspace: Class E 

Airport Information

Airport: YELLOWSTONE RGNL (COD)
Runway Surface Type: Asphalt
Airport Elevation: 5102 ft
Runway Surface Condition: Dry
Runway Used: 04
IFR Approach: None
Runway Length/Width: 8268 ft / 100 ft
VFR Approach/Landing: Full Stop; Traffic Pattern 

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude:  44.520278, -109.023889 (est)

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