Tuesday, October 17, 2017

Turbine Cubs of Wyoming PA-18, N181TJ: Accident occurred October 15, 2017 in Skull Valley, Tooele County, Utah -and- Accident occurred July 14, 2017 in Shoshoni, Fremont County, Wyoming

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

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


Location: Skull Valley, UT
Accident Number:  WPR18LA009
Date & Time: 10/15/2017, 1000 MDT
Registration: N181TJ
Aircraft: BARBER WARREN D TURBINE CUBS P A 18
Aircraft Damage: Substantial
Defining Event: Nose over/nose down
Injuries: 2 None
Flight Conducted Under:  Part 91: General Aviation - Personal

On October 15, 2017, about 1000 mountain daylight time, an experimental amateur built tailwheel equipped Barber Turbine Cubs PA-18, N181TJ, nosed over during a precautionary landing near Skull Valley, Utah. The private pilot and passenger were not injured. The airplane sustained substantial damage to both wings and empennage. 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. Visual meteorological conditions prevailed and no flight plan was filed for the local flight which originated from West Jordan, Utah, about 0915.

In a written statement to the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), the pilot reported that after a thorough pre-flight inspection, including checking for water in the fuel system, he conducted a local daytime flight. The pilot stated that he had just completed a low altitude pass at an altitude of about 250 to 300 feet above ground level to observe an object on the ground and was applying power to initiate a climb. During the application of power, the engine stumbled slightly and seemed to hesitate. The pilot applied carburetor heat after observing the outside air temperature to be 41° F and thinking maybe carburetor ice. The pilot further stated that he applied full power and the engine again seemed to hesitate, and decided to initiate a precautionary landing to an open salt flat area.

The pilot further reported that he conducted a tail low wheel landing and as the airplane touched down, as weight was transferred to the wheels, the tail raised and the airplane nosed over. Following the accident, the pilot noted that both main wheel brakes were engaged when he attempted to rotate both the left and right main wheels. He added that neither himself or his passenger applied pressure to the heel brakes during the landing sequence.

During a telephone conversation with the pilot, he reported that he was using cabin heat during the entire flight due to the outside air temperature.

Review of a video provided by the pilot's mechanic, revealed that following the accident, the right main wheel was difficult to rotate.

Examination of the recovered wreckage revealed that both wings were removed to facilitate transport of the wreckage. The airplane was equipped with a Dynon FlightDEK-D180, which has an option to provide carburetor air temperature. Power was applied to the airframe, and the FlightDEK-D-180 functioned normally.

The cabin heat vent, located at the base of the firewall, aligned in the middle of the airframe, was free of restrictions, and the cabin heat lever actuated normally. The left and right brake master cylinders remained secured to their respective mounts. When actuated by hand, the right brake pedal needed minimal input to actuate the brake, however, the left brake pedal needed a significant amount of movement to actuate the brake. Both the left and right main landing gear wheels moved unrestrictedly. The brake reservoir cap was removed and a minimal amount of hydraulic fluid was observed. The vented cap was free of debris and restrictions. A heat gun was utilized to heat both the left and right master cylinders. After about 25 minutes of the application of heat to the right master cylinder, it was noted that the brake engaged, resulting in restricted movement of the right main wheel by hand. The application of heat to the left master cylinder resulted in no change.

The engine remained secure to its mount. All engine accessories remained attached to their respective mounts. All fuel lines remained attached. Throttle, mixture, and carburetor heat control continuity was established from the cockpit controls to the engine. The wooden propeller assembly remained attached to the crankshaft however, one of the propeller blades was separated at the propeller hub.

One of the two magnetos were equipped with an impulse coupling. When the engine crankshaft was rotated, spark was produced on the impulse coupling equipped magneto leads. The opposing magneto was not removed or examined.

The bottom four spark plugs were removed and examined. All four spark plugs exhibited gray deposits within the electrode area and exhibited normal operational signatures. The ignition harness was intact and undamaged.

The carburetor was equipped with a carburetor temperature probe. It was noted that one of the two wires was separated from the crimped side of an electrical connector. The wire exhibited missing shielding at the end and no wire was observed within the electrical connector. The carburetor was removed and examined. The throttle and mixture levers moved from stop to stop by hand freely. The accelerator pump functioned normally when the throttle lever was actuated. The carburetor was disassembled and the internal floats were intact and moved freely. The needle valve and seat were intact.

The induction system was intact and free of debris with the exception of dirt wedged within the air filter. The exhaust system was intact and undamaged. The scat tubing for cabin heat remained attached and undamaged.

No evidence of any preexisting mechanical malfunction that would have precluded normal operation of the engine was found.

The Federal Aviation Administration (FAA) published Special Airworthiness Information Bulletin (SAIB) CE-09-35 on June 30, 2009, regarding carburetor ice prevention. The conditions encountered in this accident (ambient temperature 41o F, dew point 23o F) were in the area of icing at glide and cruise power. 

Pilot Information

Certificate: Private
Age: 55, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s): None
Restraint Used:  
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: 01/20/2017
Occupational Pilot: No
Last Flight Review or Equivalent: 09/29/2017
Flight Time: 2344 hours (Total, all aircraft), 227 hours (Total, this make and model), 2284 hours (Pilot In Command, all aircraft), 13 hours (Last 90 days, all aircraft), 13 hours (Last 30 days, all aircraft), 1 hours (Last 24 hours, all aircraft)
  
Aircraft and Owner/Operator Information

Aircraft Manufacturer: BARBER WARREN D
Registration: N181TJ
Model/Series: TURBINE CUBS P A 18 NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 2009
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: TC0705014
Landing Gear Type: Tailwheel
Seats: 
Date/Type of Last Inspection: 07/01/2017, Conditional
Certified Max Gross Wt.: 
Time Since Last Inspection: 13 Hours
Engines: 1 Reciprocating
Airframe Total Time: 379.8 Hours at time of accident
Engine Manufacturer: Lycoming
ELT: 
Engine Model/Series: O-360
Registered Owner: On file
Rated Power: 180 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: KSLC, 4225 ft msl
Observation Time: 1654 UTC
Distance from Accident Site: 41 Nautical Miles
Direction from Accident Site: 75°
Lowest Cloud Condition: Clear
Temperature/Dew Point: 8°C / -5°C
Lowest Ceiling: None
Visibility:  10 Miles
Wind Speed/Gusts, Direction: 3 knots, 30°
Visibility (RVR): 
Altimeter Setting: 30.55 inches Hg
Visibility (RVV): 
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: West Jordan, UT (U42)
Type of Flight Plan Filed: None
Destination: West Jordan, UT (U42)
Type of Clearance: None
Departure Time: 0915 MDT
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: 40.609167, -112.836389 (est)

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

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Salt Lake City, Utah

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

http://registry.faa.gov/N181TJ

NTSB Identification: WPR18LA009
14 CFR Part 91: General Aviation
Accident occurred Sunday, October 15, 2017 in Skull Valley, UT
Aircraft: BARBER WARREN D TURBINE CUBS P A 18, registration: N181TJ
Injuries: 2 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 October 15, 2017, about 1000 mountain daylight time, a tailwheel equipped Barber Turbine Cubs PA-18, N181TJ, nosed over during a precautionary landing near Skull Valley, Utah. The private pilot and passenger were not injured. The airplane sustained substantial damage to both wings and empennage. 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. Visual meteorological conditions prevailed and no flight plan was filed for the local flight which originated from West Jordan, Utah, about 0915. 

The pilot reported that after descending to an altitude of about 250 to 300 feet above ground level, he applied power to initiate a climb. As he increased power, the engine "coughed" and the pilot applied carburetor heat. The pilot stated that the engine did not seem to accelerate as normal, and decided to initiate a precautionary landing to an open salt flat ahead. During the tail low landing, shortly after the main landing gear touched the ground, the airplane immediately nosed over. 

The wreckage has been relocated to a secure location for further examination.

Federal Aviation Administration / Flight Standards District Office; Denver, Colorado

Aircraft made a precautionary landing on a road, propeller separated.

Date: 14-JUL-17
Time: 14:30:00Z
Regis#: N181TJ
Aircraft Make: TURBINE CUBS
Aircraft Model: P A 18
Event Type: ACCIDENT
Highest Injury: NONE
Aircraft Missing: No
Damage: SUBSTANTIAL
Activity: UNKNOWN
Flight Phase: LANDING (LDG)
City: SHOSHONI
State: WYOMING

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