ERA09CA479

NTSB accident investigation · Jonker JS-1B · Tullahoma, TN · August 23, 2009

Accident · No injuriesData collectionFinal report
Date
August 23, 2009, 16:52 local (21:52 UTC)
Place
Tullahoma, TN
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N504BTJonker JS-1B
Defining event
Landing: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed · report December 29, 2009
Report
Approved by Office Director
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
Case key
74588

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 a proper glidepath while on approach, resulting in landing short of the runway.

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.

Performance/control parameters: descent/approach/glide pathAircraft › Aircraft oper/perf/capability · Not attained/maintainedJonker Sailplanes CC JS 1B: 1 caseAll aircraft: 809 casesProbable cause
Wind: sudden wind shiftEnvironmental issues › Conditions/weather/phenomena · Effect on operationJonker Sailplanes CC JS 1B: 1 caseAll aircraft: 114 cases

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 had completed his first flight in his newly purchased glider earlier in the day. He stated that the flight lasted about 2.3 hours and was "an absolute pleasure." A witness familiar with the make and model of the accident glider had flown alongside the accident pilot in an identical glider during the flight, and stated that the accident pilot's takeoff, flight, and landing were "textbook examples." During the second flight of the day, the accident pilot was towed to 1,000 feet above ground level for the purpose of making a traffic pattern flight with a subsequent landing. The pilot stated that the downwind leg of the traffic pattern turning to the base leg was "high." The pilot applied full flaps, and stated that on the final leg of the traffic pattern, his sight picture was "still high," and the runway was "easily made." The pilot's sight picture then "quickly" changed to "short of the runway," and he realized he would not clear the trees prior to the runway. The pilot pitched up to avoid the trees, and after clearing them, "unloaded the wings" and "dived" into a parking lot. The glider impacted the parking lot and came to rest after the left wing impacted a tree. The glider sustained substantial damage to the left wing and vertical stabilizer. Neither the pilot nor a Federal Aviation Administration inspector, who examined the glider after the accident, reported any mechanical malfunctions or anomalies. Several witnesses on the ground reported a noticeable subsidence of wind while the glider was on the final leg of the traffic pattern. The nearest weather reporting station, located approximately 50 miles northwest of the accident site, reported winds from 320 degrees at 10 knots at the time of the accident.

Factual narrative

The pilot had completed his first flight in his newly purchased glider earlier in the day. He stated that the flight lasted about 2.3 hours and was "an absolute pleasure." A witness familiar with the make and model of the accident glider had flown alongside the accident pilot in an identical glider during the flight, and stated that the accident pilot's takeoff, flight, and landing were "textbook examples." During the second flight of the day, the accident pilot was towed to 1,000 feet above ground level for the purpose of making a traffic pattern flight with a subsequent landing. The pilot stated that the downwind leg of the traffic pattern turning to the base leg was "high." The pilot applied full flaps, and stated that on the final leg of the traffic pattern, his sight picture was "still high," and the runway was "easily made." The pilot's sight picture then "quickly" changed to "short of the runway," and he realized he would not clear the trees prior to the runway. The pilot pitched up to avoid the trees, and after clearing them, "unloaded the wings" and "dived" into a parking lot. The glider impacted the parking lot and came to rest after the left wing impacted a tree. The glider sustained substantial damage to the left wing and vertical stabilizer. Neither the pilot nor a Federal Aviation Administration inspector, who examined the glider after the accident, reported any mechanical malfunctions or anomalies. Several witnesses on the ground reported a noticeable subsidence of wind while the glider was on the final leg of the traffic pattern. The nearest weather reporting station, located approximately 50 miles northwest of the accident site, reported winds from 320 degrees at 10 knots at the time of the accident.

Aircraft

Registration
N504BT
Reported as
Jonker JS-1B
Category
Glider
Serial number
1B-004
Airframe hours
122
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Barton L. Tate
Registered owner
Barton L. Tate
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · August 19, 2009
Departed
THA · Tullahoma, TN
Destination
THA · Tullahoma, TN
Flight plan
Unknown
Airport
THA · Tullahoma Regional, runway 36, 5,002 × 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
66
Injuries
None
Certificates
Flight instructor, Airline transport, Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
April 30, 2009
Seat
Single
Flight hours
5,705 total · 3 in this make and model · 5,463 as pilot in command · 394 in the last 90 days · 61 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
320° at 10 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 55 °F
Altimeter
29.97 inHg
Observed at
BNA, 49 nm away

Docket · 4

The files NTSB released with the investigation on October 15, 2009, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.0 MB in all.