FTW02FA243

NTSB accident investigation · Schweizer SGS 1-34 · Decatur, TX · September 2, 2002

Accident · FatalField investigationFinal report
Date
September 2, 2002, 18:00 local (23:00 UTC)
Place
Decatur, TX
Injuries
1 fatal
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N2691HSchweizer SGS 1-34
Weather
Visual (VMC) · Day
Status
Completed · report September 30, 2003
Report
Approved by Office Director
Parties
North Texs Soaring, FAA FSDO
FAA report
20020902022419A
Case key
55599

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 failure to maintain airspeed resulting in an inadvertent stall. A contributing factor was lack of total experience in the make and model of the accident aircraft.

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 flightApproach - vfr pattern - final approach
Airspeed - not maintainedPilot in commandCause
Lack of total experience in type of aircraftPilot in commandFactor
Stall - inadvertentPilot in command
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground

Analysis

As the glider turned final for the runway, a witness observed the glider align with the taxiway. The witness reported that the glider "appeared to stall," then nosed-down and impact the ground short of the taxiway. The pilot had a total of 18.4 hours in gliders, and received a glider rating about 11 months prior to the accident. This was the pilot's second flight in the medium performance glider. The first flight was accomplished earlier in the day of the accident. Flight control continuity was confirmed from the cockpit to all flight control surfaces.

Factual narrative

History of flight

On September 2, 2002, approximately 1800 central daylight time, a Schweizer SGS 1-34 glider, N2691H, was substantially damaged when it impacted terrain during following a loss of control while on final approach for landing at the Decatur Municipal Airport near Decatur, Texas. The glider was registered to and operated by North Texas Soaring of Decatur. The private pilot, sole occupant of the glider, was fatally injured. 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 departed the Decatur Municipal Airport, approximately 1745.

A witness near the airport reported that he observed the glider turn final for runway 16, and it appeared to be aligned with the taxiway. The witness further reported that the glider "appeared to stall" on final approach as he observed the glider nosed down, descent, and impact the ground north of the taxiway.

Personnel information

The pilot was issued a private pilot certificate on January 22, 2001, for single-engine land airplanes, and on October 28, 2001, she was issued a glider rating. The pilot had accumulated a total of 92.4 flight hours, of which 74.0 hours were in airplanes and 18.4 hours in gliders. A review of the pilot's records revealed that the pilot had logged 1 hour and 45 minutes in the last 30 days in gliders. The accident flight was the second flight of the day in the same make and model as the accident glider. The pilot held a valid third class medical certificate, issued June 20, 2002. The medical certificate stipulated a limitation to wear corrective lenses when operating an aircraft.

Aircraft information

The 1976-model Schweizer SGS 1-34 was a single-place, medium performance, all metal sailplane with a wingspan of 49.2 feet. The wing area was 151.0 square feet with an aspect ratio of 16. The aircraft's empty weight was 640 pounds and its maximum gross weight was 840 pounds. The airplane had 75 pounds of ballast under the pilot's seat. A review of the aircraft's maintenance records revealed that the glider underwent its last annual inspection on September 1, 2001, at an aircraft total time of 1,515.0 hours. At the time of the accident, the glider had accumulated 1,560.0 hours. No evidence of uncorrected maintenance discrepancies was noted in the records.

Meteorological information

At 1753, the weather observation facility at the Denton Municipal Airport (located 20 miles east of the accident site), reported the wind from 140 degrees at 8 knots, visibility 10 statute miles, clear skies, temperature 96 degrees Fahrenheit, dew point 61 degrees Fahrenheit, and an altimeter setting of 29.89 inches of mercury.

Aerodrome information

The Decatur Municipal Airport is located 2 miles north of Decatur, at an elevation of 1,047 feet. The airport features one asphalt runway, identified as 17 and 35, which is 3,900 feet long and 60 feet wide. The ground drops sharply 160 feet north of threshold for runway 17.

Wreckage impact information

The glider impacted the ground on a magnetic heading of 150 degrees, approximately 2.5 feet below the crest of the steep embankment north of the taxiway for runway 17. The wreckage of the glider came to rest about 5 feet southwest of the initial impact scar.

The nose of the glider was crushed up and aft, and the canopy was found separated from the fuselage. The left wing was bent aft near the inboard end of the aileron, and there was a gap between the left wing's leading edge and the fuselage. A steel fence pole was found sticking into the bottom of the right wing. The fuselage was buckled forward of the leading edge of both wings. Control continuity was confirmed from the cockpit to all flight control surfaces.

Medical and pathological information

On September 3, 2002, an autopsy was performed on the pilot at the Tarrant County Morgue, Fort Worth, Texas. No evidence was found of any preexisting disease that could have contributed to the accident

Toxicological testing on the pilot, was performed by the FAA's Civil Aeromedical Institute, near Oklahoma City, Oklahoma, for carbon monoxide, cyanide, alcohol, and drugs. The toxicological tests were negative.

Additional data

The glider was released to the owner's representative on September 2, 2002.

Aircraft

Registration
N2691H
Reported as
Schweizer SGS 1-34
Category
Glider
Serial number
91
Airframe hours
1,515
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
North Texas Soaring
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 1, 2001 · 45 hours before
Departed
8F7 · Decatur, TX
Airport
8F7 · Decatur Muni, runway 17, 3,900 × 60 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
32
Injuries
Fatal
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Last flight review
October 28, 2001
Seat
Center
Toxicology
Performed
Flight hours
93 total · 1 in this make and model · 20 in the last 90 days · 1 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
97 °F, dew point 61 °F
Altimeter
29.88 inHg
Observed at
DTO, 20 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.