Saturday, March 17, 2018

McKenna SD-1A, N31313: Accident occurred June 07, 2017 at Dodge County Airport (UNU), Juneau, Wisconsin

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Milwaukee, Wisconsin

Aviation Accident Factual 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/N31313

Location: Juneau, WI
Accident Number: CEN17LA224
Date & Time: 06/07/2017, 0930 CDT
Registration: N31313
Aircraft: MCKENNA SD-1A
Aircraft Damage: Substantial
Defining Event: Flight control sys malf/fail
Injuries: 1 None
Flight Conducted Under:  Part 91: General Aviation - Personal

On June 7, 2017, about 0930 central daylight time, an experimental amateur-built SD-1A airplane, N31313, was substantially damaged during a precautionary landing at Dodge County Airport (KUNU), Juneau, Wisconsin. The private-rated pilot was not injured. The personal flight was conducted under the provisions of Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no Federal Aviation Administration (FAA) flight plan had been filed for the flight. The local flight had departed about 0900.

According to the pilot, immediately after takeoff the left wing felt "extremely heavy" and required an "exceptional amount of right aileron" to maintain level flight. The pilot was able to fly the airplane around the traffic pattern and perform a precautionary landing on runway 20. During the landing, the airplane bounced, and turned to the right. The left main landing gear collapsed, and the engine mount was substantially damaged.

According to the FAA inspector who responded to the accident, the wings had been taken off the airplane prior to its purchase. The pilot purchased the airplane in April of 2016. During the reinstallation of the wings, in April of 2017, the pilot installed the wing bolts where he thought they should go. He did not perform any measurements during this reinstallation. The Airframe and Powerplant Mechanic who signed off on the condition inspection did not confirm the position of the wings and more specifically, the angle of incidence.

The accident flight was the first flight after the reinstallation of the wings. Postaccident examination of the airplane revealed that the flight controls were continuous and correct; however, the angle of incidence, on the wings, was incorrect. No other anomalies were noted that would have precluded normal operation. 

Pilot Information

Certificate: Private
Age: 72, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 3-point
Instrument Rating(s):  None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Sport Pilot None
Last FAA Medical Exam: 04/01/2007
Occupational Pilot: No
Last Flight Review or Equivalent: 06/06/2016
Flight Time:  388.2 hours (Total, all aircraft), 1 hours (Total, this make and model), 120.5 hours (Pilot In Command, all aircraft), 4.7 hours (Last 90 days, all aircraft), 4.7 hours (Last 30 days, all aircraft), 0.5 hours (Last 24 hours, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Manufacturer: MCKENNA
Registration: N31313
Model/Series: SD-1A
Aircraft Category: Airplane
Year of Manufacture: 1977
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 7
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 04/26/2017, Condition
Certified Max Gross Wt.: 1300 lbs
Time Since Last Inspection: 197 Hours
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Continental Motors
ELT: C91A installed, not activated
Engine Model/Series: O-200G
Registered Owner: On file
Rated Power: 100 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: KUNU, 934 ft msl
Observation Time: 0935 CDT
Distance from Accident Site:
Direction from Accident Site:
Lowest Cloud Condition: Clear
Temperature/Dew Point: 19°C / 9°C
Lowest Ceiling: None
Visibility:  10 Miles
Wind Speed/Gusts, Direction: Calm
Visibility (RVR):
Altimeter Setting: 30.2 inches Hg
Visibility (RVV): 
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Juneau, WI (UNU)
Type of Flight Plan Filed: None
Destination: Juneau, WI (UNU)
Type of Clearance: None
Departure Time: 0900 CDT
Type of Airspace: Class G

Airport Information

Airport: Dodge County Airport (UNU)
Runway Surface Type: Asphalt
Airport Elevation: 934 ft
Runway Surface Condition: Dry
Runway Used: 20
IFR Approach: None
Runway Length/Width: 4027 ft / 75 ft
VFR Approach/Landing: Full Stop; Precautionary Landing 

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:  43.426389, -88.703889 (est)

NTSB Identification: CEN17LA224
14 CFR Part 91: General Aviation
Accident occurred Wednesday, June 07, 2017 in Juneau, WI
Aircraft: MCKENNA SD 1A, registration: N31313
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On June 7, 2017, about 930 central daylight time, an amateur-built McKenna SD 1A airplane, N31313, was substantially damaged during a precautionary landing at Dodge County Airport (UNU), Juneau, Wisconsin. The private pilot was not injured. The personal flight was conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no Federal Aviation Administration (FAA) flight plan had been filed for the flight. The local flight was originating at the time of the accident.

According to the pilot, immediately after takeoff the left wing felt "extremely heavy" and required an "exceptional amount of right aileron" to maintain level flight. The pilot was able to fly the airplane around the traffic pattern and perform a precautionary landing on runway 20. During the landing the airplane bounced and turned hard to the right. The left main landing gear collapsed and the engine mount was substantially damaged.

No comments: