DFW05LA016

NTSB accident investigation · Wilson Loenslo YMF-80 · Arcola, TX · November 5, 2004

Accident · Serious injuriesLimited investigationFinal report
Date
November 5, 2004, 15:00 local (21:00 UTC)
Place
Arcola, TX
Injuries
1 serious
Damage
Destroyed
Phase of flight
Initial climb
Aircraft
N6254AWilson Loenslo YMF-80
Weather
Visual (VMC) · Day
Status
Completed · report April 28, 2005
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20041105028909A
Case key
60514

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

On this page

Probable cause

The pilot's failure to maintain airspeed sufficient for flight resulting in an inadvertent stall/spin during takeoff initial climb.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - in flightTakeoff - initial climb
Airspeed - not maintainedPilot in commandCause
Stall/spin - inadvertentPilot in command
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground

Analysis

Shortly after takeoff, the airplane was observed on a pronounced nose-high climb attitude. Subsequently, the airplane stalled and impacted the terrain in a nose low attitude approximately 1,000 feet beyond the departure end of the runway. Witnesses observed the airplane in a very steep climb attitude to an altitude of approximately 500 feet above ground level then start to spin in a clockwise rotation as it descended behind a tree line. Flight control continuity was established throughout the airplane at the accident site and no mechanical anomalies were noted with airframe. The accident flight was the first flight in the airplane by the 328-hour pilot since the airplane was reassembled.

Factual narrative

On November 5, 2004, approximately 1500 central standard time, an amateur-built Wilson Loenslo YMF-80 tailwheel-equipped single-engine airplane, N6254A, was destroyed upon impact with terrain following a loss of control during initial takeoff climb from the Houston Southwest Airport (AXH), near Arcola, Texas. The private pilot, sole occupant of the airplane, was seriously injured. The airplane was registered to and operated by the pilot/builder. Visual meteorological conditions prevailed and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 personal flight. The local flight was originating at the time of the accident.

The Federal Aviation Administration (FAA) inspector, who responded to the accident site, reported that several witnesses located at AXH observed the airplane in a very pronounced nose-high climb attitude shortly after takeoff from runway 27 (5,003-foot long and 100-foot wide asphalt runway). At an approximately altitude of 500 feet above ground level (agl), the airplane was observed starting to spin in a clockwise rotation and descending behind a tree line. Subsequently, the airplane impacted terrain in a nose-low attitude approximately 1,000 feet beyond the departure end of the runway.

The FAA inspector stated that the airplane was initially built in 1999, and flown for approximately eight hours in 2000, by the 328-hour pilot, who was also the builder of the airplane. The airplane was disassembled in 2003, and transported to Arcola before being reassembled by the pilot. The accident flight was the first flight since the airplane was reassembled.

Examination of the wreckage of the airplane at the accident site by the FAA inspector confirmed that the airplane impacted soft ground in a nose-low attitude. The Subaru automotive engine was found partly embedded in the soft ground. All of the main components of the airframe were found within the main wreckage, and flight control continuity was established to all flight controls.

At 1453, the Automated Surface Observing System at the Sugar Land Regional Airport, near Sugar Land, Texas, located approximately 11 nautical miles northwest of the accident site reported variable wind at 5 knots, visibility 10 statute miles, sky condition clear, temperature 71 degrees Fahrenheit, dew point 45 degrees Fahrenheit, and an altimeter setting of 30.25 inches of Mercury.

Despite several attempts by the investigator-in-charge, the pilot did not provide the Safety Board with a completed Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2).

Aircraft

Registration
N6254A
Reported as
Wilson Loenslo YMF-80
Category
Airplane, amateur-built
Serial number
566786524
Engine
Subaru ALL MDLS A/B, 105 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Registered owner
Michael T. Wilson
Airworthiness certificate
Special, Experimental (Special)
Departed
AXH · Arcola, TX
Airport
AXH · Houston Southwest Airport, runway 27, 5,003 × 100 ft, asphalt

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
56
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Flight hours
329 total · 8 in this make and model · 39 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 45 °F
Altimeter
30.25 inHg
Observed at
KSGR, 11 nm away

FAA reports on this event · 1

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