CEN10CA089

NTSB accident investigation · Lyman Randall/Scott David Avid Flyer · Eldon, MO · December 28, 2009

Accident · Minor injuriesData collectionFinal report
Date
December 28, 2009, 13:30 local (19:30 UTC)
Place
Eldon, MO
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N491DSLyman Randall/Scott David Avid Flyer
Defining event
Maneuvering: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report May 6, 2010
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA-Kansas City FSDO
FAA report
20091228053139A
Case key
75231

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's inability to climb or maintain proper airspeed due to the improper pitch setting of the propeller.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Propeller system: propeller assemblyAircraft › Aircraft propeller/rotor · Incorrect service/maintenanceLyman Randall/Scott David AVID FLYER: 1 caseAll aircraft: 29 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleLyman Randall/Scott David AVID FLYER: 1 caseAll aircraft: 1,681 casesProbable cause
Aircraft capability: climb capabilityAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleLyman Randall/Scott David AVID FLYER: 1 caseAll aircraft: 183 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported that he was preparing the homebuilt airplane for its first flight for the owner. He said that on the morning of the accident the airplane's engine was run for approximately 30 minutes for break-in at full power. After the engine run the cowling was reinstalled and the engine ran for an additional 15 minutes. Subsequently, the pilot performed taxi testing of the airplane. He had made 2 taxi tests to about 40 miles per hour, which he estimated would be the airplane's approximate stall speed. He stated that on the third taxi test, when about two-thirds of the way down the runway, a gust of wind caused the airplane to become airborne. The pilot stated that when he was able to get the airplane under control there was insufficient runway remaining to perform a landing and he decided to continue and return for landing. He stated that this was to be a taxi test only and that he had no intention to fly the airplane at that time. While attempting to climb, the pilot noticed that the engine speed was too high and he was not able to climb effectively. The pilot attempted to turn the airplane back to the airport to make a downwind landing, but the airplane began to stall. He stated that he lowered the nose and determined that he would not be able to make the runway. As the airplane's altitude decayed, the pilot pulled back on the stick and the airplane struck the ground. The pilot stated that he believed that the pitch setting of the airplane's propeller was improper, which did not allow proper thrust production for flight. During the accident the propeller blades were fragmented and determination of the installed pitch setting could not be obtained.

Factual narrative

The pilot reported that he was preparing the homebuilt airplane for its first flight for the owner. He said that on the morning of the accident the airplane's engine was run for approximately 30 minutes for break-in at full power. After the engine run the cowling was re-installed and the engine run for an additional 15 minutes. Subsequently, the pilot performed taxi testing of the airplane. He had made 2 taxi tests to about 40 miles per hour which he estimated would be approximately stall speed for the airplane. He stated that on the third taxi test, when about two-thirds of the way down the runway, a gust of wind caused the airplane to become airborne. The pilot stated that when he was able to get the airplane under control there was insufficient runway remaining to perform a landing and he decided to continue and return for landing. He stated that this was to be a taxi test only and that he had no intention to fly the airplane at that time. While attempting to climb, the pilot noticed that the engine speed was too high and he was not able to climb effectively. The pilot attempted to turn the airplane back to the airport to make a downwind landing, but the airplane began to stall. He stated that he lowered the nose and determined that he would not be able to make the runway. As the airplane's altitude decayed, the pilot pulled back on the stick and the airplane struck the ground. The pilot stated that he believed that the pitch setting of the airplane's propeller was improper which did not allow proper thrust production for flight. During the accident the propeller blades were fragmented and determination of the installed pitch setting could not be obtained.

Aircraft

Registration
N491DS
Reported as
Lyman Randall/Scott David Avid Flyer
Category
Airplane, amateur-built
Serial number
491
Engine
Rotax 582, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Flight test · Part 91
Airworthiness certificate
Special, Experimental (Special)
Departed
H79 · Eldon, MO
Destination
H79 · Eldon, MO
Airport
H79 · Eldon Model Airpark, runway 36, 3,300 × 75 ft, concrete

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
60
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
July 12, 2009
Seat
Left
Flight hours
1,500 total · 0 in this make and model · 3 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 13 knots, gusting 17
Visibility
10 statute miles
Lowest ceiling
None
Temperature
39 °F, dew point 23 °F
Altimeter
30.26 inHg
Observed at
AIZ, 16 nm away

Docket · 1

The files NTSB released with the investigation on February 12, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.0 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.