Monday, December 17, 2018

Sonex, N393SX: Accident occurred December 15, 2018 in Columbia County, Wisconsin and accident occurred July 18, 2016 at Lodi Lakeland Airport (9WN5)


Federal Aviation Administration / Flight Standards District Office; Milwaukee, Wisconsin

Struck tree line and landing in a field.


https://registry.faa.gov/N393SX


Date: 15-DEC-18

Time: 20:10:00Z
Regis#: N393SX
Aircraft Make: EXPERIMENTAL
Aircraft Model: SONEX
Event Type: ACCIDENT
Highest Injury: MINOR
Aircraft Missing: No
Damage: SUBSTANTIAL
Activity: UNKNOWN
Flight Phase: APPROACH (APR)
Operation: 91
City: LODI
State: WISCONSIN



One man has been taken to the hospital after a small plane crash in Lodi. The crash happened just before 2:15 p.m.

According to the Columbia County Sheriff’s Office, the pilot was the only person inside the plane when it went down. He suffered minor injuries but was able to get himself out of the plane before an ambulance took him to the hospital.


Investigators have not released his name, but they said the pilot is in his 70’s and lives in the Village of Dane.


Lt. Wayne Smith from the Columbia County Sheriff’s Office said the cause of the crash is still under investigation but they know the plane was coming in for a landing at the nearby Lodi-Lakeland airport. The plane flew too low and struck a tree before crashing in the field.


“This is really fortunate that this worked out the way it did,” Smith said. “It’s a bad crash but he was able to walk away to get help, there was no fire and nothing else was struck.”


Chris Layton was working just yards away at a nearby bar.


“We heard crackling from the trees behind us and we just happened to turn our heads just in time to see the plane nose dive right into the ground,” he said.


That’s when Layton said he ran towards the wreck.


“I kicked off my shoes because I don’t tie them and I was running barefoot through the field to make sure he was okay,” he said.


Layton said there was smoke at first but it dissipated before the man pulled himself out.


“He was conscious and he was a little shaken up,” Layton said. “He said he was done flying.”


Smith said the pilot is expected to recover and there was no evidence of any fuel leaks caused by the crash.


“The bad news is there was an airplane here that crashed,” he said. “The good news is the pilot is going to be fine and no one else on the ground was hurt.”


Layton said he didn’t know the man inside the plane but he’s looking forward to the pilot’s recovery. After such a violent scene, he said he never expected good news.


“From what I had seen,” he said. “I didn’t think anyone would have been alive.”


According to Smith, they’re still working to figure out why the plane was flying so low. He said they are in touch with the Federal Aviation Administration and the National Transportation Safety Board. Those agencies will take the lead on the investigation.


Crews were on scene until about 4:30.


Original article can be found here ➤ https://wkow.com




LODI, Wis. - A Lodi resident is feeling lucky to be safe tonight after a plane crashed in his backyard Saturday.

Officials are investigating the Columbia County crash which happened near KD’s Bar and Grill on Fair Street. The pilot, a town of Dane resident in his 70s, hit some trees and crashed into a field while on his way to a landing strip about a half-mile away, according to the Columbia County Sheriff’s Department.


“It’s kind of surreal,” said Kurtis Gauger, whose house is about 50 yards from the crashed plane.


It was strange enough for Gauger to see a commotion in his backyard Saturday afternoon. He definitely didn't expect to see the plane.


"I kind of had to look at it a couple times,” he said. “(I was thinking,) ‘Oh my God, what the hell happened? I hope everyone’s OK.'”


 Lt. Wayne Smith, of the Columbia County Sheriff’s Department, said the pilot was able to walk away from the crash, but was taken to the hospital with minor injures.


"This is really fortunate this worked out the way it did,” Smith said. "You're first concerned about how many people are on the plane and what might their conditions be, but also when a plane comes down out of the sky, what may it have struck?"


Smith said the plane will stay in place until the Federal Aviation Administration and the National Transportation Safety Board decide what should happen next.


He said the crashed plane is a Sonex, one that can be home-built. He's glad the aircraft took the brunt of the injuries.


"Oh my God, what if it was over a little bit?” Gauger said. “It could have been worse for him too."


Knowing everyone is safe, Gauger instead has something to tell his friends. He just hopes a plane never hits so close to home again.


"Oh no, this is a once-in-a-million thing that happens,” he said. “It’s just kind of crazy.”


Original article can be found here ➤ https://www.channel3000.com




COLUMBIA COUNTY, Wis. (WMTV) -- A pilot of a single-engine plane suffered minor injuries after crashing near Lodi Lakeland Airport on Saturday.


According to the Columbia County Sheriff's office, the Sonex 393 plane crashed into a field near 1445 Fair St., after striking trees while approaching the airport just after 2:00 p.m.


The 73-year-old male pilot from Dane County was transported to the hospital. The aircraft was heavily damaged.


Officials at the Columbia County Sheriff's Office believe the plane is privately operated and there are no reports pilot had communication with the Lodi Lakeland Airport.


The cause of the crash is under investigation by the National Transportation Safety Board and Federal Aviation Administration.


The Columbia County Sheriff's Office was assisted by Lodi Fire and EMS.


Original article can be found here ➤ https://www.nbc15.com


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


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


Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf


http://registry.faa.gov/N393SX


Location: Lodi, WI
Accident Number: CEN16LA273
Date & Time: 07/18/2016, 1915 CDT
Registration: N393SX
Aircraft: BRANDT SONEX
Aircraft Damage: Substantial
Defining Event: Loss of engine power (partial)
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal

Analysis

During a local flight, the pilot of an experimental amateur-built airplane had a partial engine power loss. He said that the engine sounded different but remained running. He turned the airplane back to the airport and noted he was high and fast. He indicated that he bled off airspeed, as he wanted to avoid buildings before landing. He subsequently reduced power and performed a landing with calm wind present. The airplane's nose and left main landing gear collapsed after touchdown, the airplane skidded to the north side of the runway, and exited the runway into a ditch where it sustained the substantial damage. The airplane was powered by an engine that the pilot/builder assembled from a kit. The airplane accumulated 25 hours of flight time at the time of the accident. The kit manufacturer engine assembly and installation manual had specific rocker shaft instructions that included procedures on how to adjust and install rocker arms. An examination revealed that the threaded shaft of a rocker arm swivel pad had separated at a point on the shaft where there was a cross drilled hole. The remaining rocker arms did not exhibit the appearance of arm adjustment in accordance with the kit manufacturer's assembly manual. Detailed examination of the failed valve adjuster showed it separated into two portions approximately mid length in the shank area between the two threaded areas. This location was coincident with a hole drilled crosswise through the shank of the valve adjuster. The fracture surfaces exhibited crack arrest patterns consistent with a fatigue fracture. The origin of the fatigue fracture appears to be coincident with the edge of the cross-drilled hole. Examination of the exemplar valve adjuster and specifically the cross-drilled hole revealed a roughly finished surface with a pronounced burr around the circumference of the hole. A professional materials engineering publication, in part, stated, "The fatigue strength of components can be reduced merely by the presence of a drilled hole; it is further reduced by failure to remove burrs (incurred during drilling) from the hole edges. Fractures originating at drilled holes are common in complex parts containing internal, intersecting machined passages because of the difficulty and expense of providing adequate break-edge radii at such locations. It could not be determined if the failure of the rocker arm was due to the misassembly of the rocker arm assembly and/or the toolmarks left by the manufacturing process. 

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The separated rocker arm assembly for undetermined reasons, which resulted in the partial loss of engine power and led to the landing gear collapsing during the subsequent forced landing.

Findings

Aircraft
Recip eng cyl section - Failure (Cause)

Personnel issues
Installation - Owner/builder
Fabrication - Other/unknown

Factual Information 

On July 18, 2016, about 1915 central daylight time, a Brandt Sonex experimental amateur-built airplane, N393SX, impacted a ditch when it exited runway 9 (1,875 feet by 105 feet, turf) at the Lodi Lakeland Airport (9WN5), near Lodi, Wisconsin, during a forced landing following a partial loss of engine power. The sport pilot was uninjured. The airplane fuselage was substantially damaged during the impact with the ditch. The airplane was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Day visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight originated from 9WN5 at time unknown.

The pilot reported a partial loss of engine power, which occurred northwest of 9WN5. He said that the engine sounded different but remained running. He turned the airplane back to the airport and noted he was high and fast. He indicated that he bled off airspeed, as he wanted to avoid buildings before landing. He subsequently reduced power and performed a landing. The airplane's nose and left main landing gear collapsed after touchdown, the airplane skidded to the north side of the runway, and exited the runway into a ditch where it sustained the substantial damage.

The pilot, age 71, held a Federal Aviation Administration (FAA) sport pilot certificate and he reported that he accumulated 180 hours of total flight time.

N393SX was a low-wing, fixed tricycle gear, 2-seat, experimental amateur-built airplane with serial number 393. It was powered by a 70-horsepower AeroVee engine driving a fixed pitch Sensenich propeller. The pilot reported that the airplane had a condition inspection completed on December 4, 2015, and that the airplane accumulated 25 hours of flight time at the time of the accident.

The airplane and engine were sold as kits that the owner assembled. The kit manufacturer engine assembly and installation manual had specific rocker shaft instructions that included procedures on how to adjust and install rocker arms.

At 1953, the recorded weather at the Dane County Regional Airport-Truax Field, near Madison, Wisconsin, was: Wind calm; visibility 10 statute miles; sky condition few clouds at 5,500 feet; temperature 27 degrees C; dew point 17 degrees C; altimeter 30.15 inches of mercury.

An FAA inspector examined the wreckage and observed that the threaded shaft of a rocker arm swivel pad on the rocker arm assembly had separated at a point on the shaft where there was a cross drilled hole. The accident engine's remaining rocker arm assemblies did not exhibit the appearance of arm assembly adjustment in accordance with the adjustment directions in the kit manufacturer's assembly manual. The separated rocker arm swivel pad and an exemplar pad from the accident engine were shipped to the National Transportation Safety Board (NTSB) Materials Laboratory for detailed examination.

An NTSB Materials Laboratory Engineer examined the items and produced Materials Laboratory Factual Report No. 16-101, which is appended to the docket material associated with this investigation. The report, in part, indicated the failed valve adjuster separated into two portions approximately mid length in the shank area between the two threaded areas. This location was coincident with a hole drilled crosswise through the shank of the valve adjuster. The fracture surfaces exhibited crack arrest patterns consistent with a fatigue fracture. The origin of the fatigue fracture appears to be coincident with the edge of the cross-drilled hole. The ball bearing on the end of the valve adjuster had seized in place and could not be rotated. A measurement of the hardness on a section of the fractured valve adjuster revealed a hardness of 20.2 on the Rockwell C scale.

Examination of the exemplar valve adjuster and specifically the cross-drilled hole revealed a roughly finished surface with a pronounced burr around the circumference of the hole.

ASM International Handbook, Volume 11, Failure Analysis and Prevention, in part, stated:

The fatigue strength of components can be reduced merely by the
presence of a drilled hole; it is further reduced by failure to remove burrs
(incurred during drilling) from the hole edges. Fractures originating at
drilled holes are common in complex parts containing internal, intersecting
machined passages because of the difficulty and expense of providing
adequate break-edge radii at such locations.

History of Flight

Prior to flight
Aircraft maintenance event

Enroute
Powerplant sys/comp malf/fail
Loss of engine power (partial) (Defining event)

Emergency descent
Off-field or emergency landing

Landing
Collision during takeoff/land 

Pilot Information

Certificate: Sport Pilot
Age: 71, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Unknown
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
Last FAA Medical Exam:
Occupational Pilot: No
Last Flight Review or Equivalent: 10/30/2015
Flight Time:  (Estimated) 180 hours (Total, all aircraft), 180 hours (Pilot In Command, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: BRANDT
Registration: N393SX
Model/Series: SONEX
Aircraft Category: Airplane
Year of Manufacture:
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 393
Landing Gear Type: Unknown
Seats: 2
Date/Type of Last Inspection: 12/04/2015, Condition
Certified Max Gross Wt.: 1100 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 25 Hours at time of accident
Engine Manufacturer: Aerovee
ELT: C91  installed, activated, did not aid in locating accident
Engine Model/Series: 
Registered Owner: On file
Rated Power: 70 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: KMSN, 866 ft msl
Distance from Accident Site: 14 Nautical Miles
Observation Time: 1953 CDT
Direction from Accident Site: 146°
Lowest Cloud Condition: Few / 5500 ft agl
Visibility:  10 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: Calm /
Turbulence Type Forecast/Actual: /
Wind Direction:
Turbulence Severity Forecast/Actual:  /
Altimeter Setting: 30.15 inches Hg
Temperature/Dew Point: 27°C / 17°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Lodi, WI (9WN5)
Type of Flight Plan Filed: None
Destination: Lodi, WI (9WN5)
Type of Clearance: None
Departure Time:  CDT
Type of Airspace:

Airport Information

Airport: LODI LAKELAND (9WN5)
Runway Surface Type: Grass/turf
Airport Elevation: 844 ft
Runway Surface Condition: Dry
Runway Used: 09
IFR Approach: None
Runway Length/Width: 1875 ft / 105 ft
VFR Approach/Landing: Forced 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:  43.333333, -89.520833 (est)

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