CHI00LA033

NTSB accident investigation · Schweizer SGS-1-34 · East Lynne, MO · November 13, 1999

Accident · Serious injuriesLimited investigationFinal report
Date
November 13, 1999, 14:30 local (20:30 UTC)
Place
East Lynne, MO
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N7646Schweizer SGS-1-34
Weather
Visual (VMC) · Day
Status
Completed · report June 21, 2000
Report
Approved by Office Director
FAA report
19991113047339A
Case key
47803

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

inadequate airspeed and a subsequent stall. Factors associated with the accident were the tailwind, the pilot's misjudgment of the wind condition, and poor inflight planning.

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
Weather condition - tailwindFactor
Weather evaluation - inaccuratePilot in commandFactor
In-flight planning/decision - misjudgedPilot in commandFactor
Airspeed - inadequatePilot in commandCause
Stall - inadvertentPilot in command
In flight collision with terrain/waterApproach - vfr pattern - final approach

Analysis

The pilot reported that while on short final to runway 18, at an altitude of 350 feet agl, the glider encountered a gust of wind and it turned left of the runway heading. He elected to perform a 360 degree turn to the left to realign the glider with the runway heading. The pilot stated that while on a northerly heading turbulence and a sink rate were encountered. He was unable to level the wings and the glider stalled, impacting the terrain. A glider pilot who witnessed the accident reported the glider was landing to the north, downwind, when the accident occurred. He reported it was common for them to land with a tailwind of 10 knots of less to minimize ground handling. The glider wreckage was located southeast of the runway. The pilot reported the local winds were from the northwest at 2 knots. The witness reported the local winds were from 200 degrees at 10 knots. The winds reported 18 miles northwest of the accident site, 23 minutes after the accident, were from 220 degrees at 15 knots.

Factual narrative

On November 13, 1999, at 1430 central standard time, a Schweizer SGS-1-34, N7646, operated by a commercial glider pilot collided with the terrain following a loss of control while in the traffic pattern to land at Richters Field, East Lynne, Missouri. The pilot was seriously injured and the glider was substantially damaged. The 14 CFR Part 91 flight was operating in visual meteorological conditions prevailed and no flight plan was filed. The local flight originated from Richter Field at 1400 cst.

The pilot reported the accident occurred when he returned to land following a local flight. He reported that while on short final to runway 18, at an altitude of 350 feet above ground level (agl), the glider encountered a gust of wind and it turned left of the runway heading. He reported he elected to perform a 360 degree turn to the left to realign the glider with the runway heading. The pilot continued to report that while on a northerly heading "violent turbulence" and a sink rate were encountered. He reported he was unable to level the wings and the glider stalled, impacting the terrain.

A glider pilot who witnessed the accident reported seeing the glider at an altitude of approximately 200 feet agl southeast of the runway on a westerly heading. He reported, "I thought it was a reasonable position for right turn to landing, but lower and slower than I would like to have seen." He reported the glider then made a turn to the left (away from the runway), and after about 270 degrees of turn, "...the nose dropped dramatically." He reported he then lost site of the glider. He reported the glider came to rest approximately 100 feet southeast of where it began its turn southeast of the runway. The witness reported they often landed downwind with a wind of 10 knots or less, to minimize ground handling.

The location of the wreckage was also comfirmed by the Cass County Sheriff's Office.

The pilot reported the local winds were from the northwest at 2 knots. The witness reported the local winds were from 200 degrees at 10 knots. The winds reported at the Kansas City, Richards-Gebaur Memorial Airport, located 18 miles northwest of the accident site were from 220 degrees at 15 knots. This weather observation was taken 23 minutes after the accident occurred.

Aircraft

Registration
N7646
Reported as
Schweizer SGS-1-34
Category
Glider
Serial number
26
Airframe hours
1,419
Engine
unknown
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Midwestern Soaring Assn., Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 1, 1999 · 16 hours before
Departed
86K
Destination
86K
Airport
86K · Richters, runway 36, 3,000 × 100 ft, grass/turf

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
73
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Center
Flight hours
2,606 total · 31 in this make and model · 27 in the last 90 days · 10 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
220° at 15 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 48 °F
Altimeter
29.00 inHg
Observed at
GVW, 18 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.

Other investigations on N7646 · 1

Matched to the same aircraft by N-number and date.