DEN07LA152

NTSB accident investigation · Slingsby Swallow Type T.45 · Hutchinson, KS · September 2, 2007

Accident · Serious injuriesLimited investigationFinal report
Date
September 2, 2007, 15:45 local (20:45 UTC)
Place
Hutchinson, KS
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N7476Slingsby Swallow Type T.45
Weather
Visual (VMC) · Day
Status
Completed · report January 31, 2008
Report
Approved by Office Director
Parties
Wichita, Kansas
FAA report
20070902022759A
Case key
66593

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 aircraft control during a low altitude release resulting in an inadvertent stall/spin. Contributing factors were the pilot's decision to turn back to the airport at low altitude and the wind gust.

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
Weather condition - gustsFactor
Aircraft control - not maintainedPilot in commandCause
In-flight planning/decision - improperPilot in commandFactor
Stall/spin - inadvertentPilot in commandCause
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground

Analysis

The glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway there seemed to be some sort of external downward force like a wind gust. The glider wheel touched the runway and the glider bounced into the air, gaining altitude rapidly. The pilot released the glider tow line and continued straight. The pilot stated that the tow plane was not in sight and there was an impression that the tow plane may have taken off. The pilot banked the glider to the right to return to the airport. During the turn the right wing stalled and the glider lost altitude rapidly. The glider impacted terrain to the west of the runway on airport property. The pilot stated that the accident could have been prevented by making a small right turn and landing straight ahead on the remaining runway.

Factual narrative

On September 2, 2007, approximately 1545 central daylight time, a Slingsby Swallow Type T.45 glider, N7476, sustained substantial damage when it impacted terrain following a loss of control during takeoff from the Sunflower Aerodrome Gliderport (SN76), Hutchinson, Kansas. The private pilot, who was the sole occupant, was seriously injured. The aircraft was registered to Wichita Soaring Association, Inc., Wichita, Kansas, and operated by the pilot. The personal flight was being conducted under the provisions of Title 14 Code of Federal Regulations Part 91 without a flight plan. The local flight was originating at the time of the accident.

According to the pilot's statement, the glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway "there seemed to be some sort of external downward force like a wind gust." The glider wheel touched the runway and the glider bounced into the air, "gaining altitude rapidly." The pilot released the glider tow line and continued straight. The pilot stated that "the tow plane was not in sight and there was an impression that the tow plane may have taken off." The pilot banked the glider to the right to return to the airport. During the turn, "the right wing stalled and the glider lost altitude rapidly." The glider impacted terrain to the west of the runway on airport property.

According to the Pilot/Operator Aircraft Accident/Incident Report (NTSB Form 6120.1), Recommendation section (How could this accident/incident have been prevented?), the pilot stated, "A small turn to the right to place the glider slightly right and out of the way of the tow plane with a landing straight ahead on the remaining runway."

Examination of the accident site by a Federal Aviation Administration inspector revealed that the glider came to rest inverted. The forward fuselage was destroyed, and both wings were separated from the airframe. No anomalies were noted with the glider systems.

At 1552, the automated weather observation from Hutchinson Municipal Airport, located approximately 9 miles north of the accident site, reported variable winds at 6 knots, visibility 10 statute miles, sky clear, temperature 32 degrees Celsius, dew point 11 degrees Celsius, and an altimeter setting of 30.12 inches of Mercury.

Aircraft

Registration
N7476
Reported as
Slingsby Swallow Type T.45
Category
Glider
Serial number
1660
Airframe hours
1,285
Engine
Damage
Substantial damage
Flight
Glider tow · Part 91
Operator
Sonja Flesberg
Registered owner
Wichita Soaring Association, Inc
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 1, 2007
Departed
SN76 · Hutchinson, KS
Airport
SN76 · Sunflower Aerodrome Gliderport

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
42
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Last flight review
July 1, 2006
Seat
Single
Flight hours
121 total · 3 in this make and model · 73 as pilot in command · 2 in the last 90 days · 1 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F, dew point 52 °F
Altimeter
30.12 inHg
Observed at
KHUT, 9 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.