National Transportation Safety Board
Aviation Accident Final Report

 

 

Location:

Burlington, WA

Accident Number:

WPR11LA015

Date & Time:

10/14/2010, 1140 PDT

Registration:

N525BD

Aircraft:

MISCHKE BD-5B

Aircraft Damage:

Substantial

Defining Event:

Loss of engine power (total)

Injuries:

1 Serious

Flight Conducted Under:

Part 91: General Aviation - Personal

Analysis

The pilot reported that shortly after takeoff for the local area flight the engine's rpms decreased and he felt a loss of thrust. The pilot made a turn in an attempt to make an emergency landing to another runway; however, the airplane touched down hard and short of the runway, substantially damaging the airplane. Postaccident examination revealed that the sprag clutch failed, preventing the engine from turning the propeller and causing a loss of thrust.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The failure of the sprag clutch during takeoff, resulting in a loss of engine thrust.

Findings

Aircraft

Propeller system - Failure (Cause)

Factual Information

On October 14, 2010, at 1140 Pacific daylight time, an experimental Mischke BD-5D, N525BD, impacted the approach end of runway 22 at Skagit Regional Airport, Burlington, Washington. The commercial pilot was operating the airplane under the provisions of 14 Code of Federal Regulations Part 91. The pilot sustained serious injuries; the airplane was substantially damaged. Visual meteorological conditions prevailed and no flight plan was filed for the local area flight.

The pilot submitted a written statement following the accident. After departing runway 10, the airplane rotated at 90 miles per hour (mph), he retracted the landing gear, and accelerated the airplane to 140 mph while climbing to 50 to 75 feet above ground level. The engine revolutions per minute (rpm) increased, then decreased from 9,000 to about 7,000, and he felt a loss of thrust in the airplane. He retarded the throttle and attempted an emergency landing on runway 22. The airplane landed hard short of the runway, with the landing gear retracted.

The pilot reported that the airplane was powered by a Yamaha Nytro snowmobile engine rated at 130 horsepower at 10,000 rpm. The engine ran at 8,000 rpm with the propeller at 4,000 rpm. Examination of the drive system revealed that the sprag clutch that connected the drive system had failed and the engine lost thrust.

A Dynon Avionics EFIS-D10A unit was recovered from the airplane and sent to the Safety Board Recorder Laboratory. Information regarding the flight track, ground, and altitude were obtained from the unit. Because the unit did not have a recent software upgrade, no additional information was recorded.

 

History of Flight

Takeoff

Loss of engine power (total) (Defining event)

Landing

Off-field or emergency landing

 

 

Pilot Information

Certificate:

Commercial

Age:

68, Male

Airplane Rating(s):

Single-engine Land

Seat Occupied:

Single

Other Aircraft Rating(s):

None

Restraint Used:

Seatbelt, Shoulder harness

Instrument Rating(s):

None

Second Pilot Present:

No

Instructor Rating(s):

None

Toxicology Performed:

No

Medical Certification:

Class 3 With Waivers/Limitations

Last FAA Medical Exam:

03/13/2009

Occupational Pilot:

No

Last Flight Review or Equivalent:

02/23/2008

Flight Time:

968 hours (Total, all aircraft), 229 hours (Total, this make and model), 968 hours (Pilot In Command, all aircraft)

 

 

Aircraft and Owner/Operator Information

Aircraft Make:

MISCHKE

Registration:

N525BD

Model/Series:

BD-5B

Aircraft Category:

Airplane

Year of Manufacture:

 

Amateur Built:

Yes

Airworthiness Certificate:

Experimental

Serial Number:

2

Landing Gear Type:

Tricycle

Seats:

1

Date/Type of Last Inspection:

03/04/2010, Condition

Certified Max Gross Wt.:

900 lbs

Time Since Last Inspection:

67 Hours

Engines:

1 Reciprocating

Airframe Total Time:

119 Hours as of last inspection

Engine Manufacturer:

YAMAHA

ELT:

Not installed

Engine Model/Series:

Nytro

Registered Owner:

David Mischke

Rated Power:

130 hp

Operator:

David Mischke

Operating Certificate(s) Held:

None

 

Meteorological Information and Flight Plan

Conditions at Accident Site:

Visual Conditions

Condition of Light:

Day

Observation Facility, Elevation:

NUW, 47 ft msl

Distance from Accident Site:

12 Nautical Miles

Observation Time:

1156 PDT

Direction from Accident Site:

200°

Lowest Cloud Condition:

Scattered / 500 ft agl

Visibility

10 Miles

Lowest Ceiling:

Broken / 1400 ft agl

Visibility (RVR):

 

Wind Speed/Gusts:

9 knots /

Turbulence Type Forecast/Actual:

/

Wind Direction:

240°

Turbulence Severity Forecast/Actual:

/

Altimeter Setting:

30.13 inches Hg

Temperature/Dew Point:

12°C / 10°C

Precipitation and Obscuration:

No Obscuration; No Precipitation

Departure Point:

Burlington, WA (BVS)

Type of Flight Plan Filed:

None

Destination:

Burlington, WA (BVS)

Type of Clearance:

None

Departure Time:

1145 PDT

Type of Airspace:

 

 

Airport Information

Airport:

Skagit Regional Airport (BVS)

Runway Surface Type:

Asphalt

Airport Elevation:

144 ft

Runway Surface Condition:

Dry

Runway Used:

22

IFR Approach:

None

Runway Length/Width:

3000 ft / 60 ft

VFR Approach/Landing:

Unknown

 

Wreckage and Impact Information

Crew Injuries:

1 Serious

Aircraft Damage:

Substantial

Passenger Injuries:

N/A

Aircraft Fire:

None

Ground Injuries:

N/A

Aircraft Explosion:

None

Total Injuries:

1 Serious

Latitude, Longitude:

48.470833, -122.420833 (est)

 


 


Administrative Information

Investigator In Charge (IIC):

Kristi Dunks

Report Date:

06/27/2011

Additional Participating Persons:

Bill Reichardt; Federal Aviation Administration; Seattle, WA

Publish Date:

06/27/2011

Investigation Docket:

http://dms.ntsb.gov/pubdms/search/dockList.cfm?mKey=77584