FTW98LA262

NTSB accident investigation · Rolladen-Schneider LS-6A · Green River, UT · June 11, 1998

Accident · Serious injuriesLimited investigationFinal report
Date
June 11, 1998, 12:15 local (18:15 UTC)
Place
Green River, UT
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N511MRolladen-Schneider LS-6A
Weather
Visual (VMC) · Day
Status
Completed · report February 15, 2001
Report
Approved by Office Director
FAA report
19980611013239A
Case key
20644

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. Factor's were the unforecasted weather (tail wind) and the inadvertent stall/spin.

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.

In flight encounter with weatherManeuvering
Weather condition - downdraftFactor
In-flight planning/decision - attemptedPilot in command
Airspeed - inadequatePilot in commandCause
Stall/spin - inadvertentPilot in commandFactor
Stall/mush - continuedPilot in command
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - open field
Terrain condition - rough/uneven

Analysis

According to the co-owner of the glider, the pilot was given an auto-tow launch from the runway and he believed that the pilot released at approximately 700 feet agl. The co-owner observed the glider circling southwest of the runway, but was losing altitude. The pilot stated that he encountered 'heavy sink almost immediately after tow release.' The co-owner further observed the glider fly over the runway, but 'was too high too land straight ahead.' The pilot further reported that 'he turned left to return to the runway and the glider began to rotate left.' The pilot said that he 'got the right rudder in and the rotation stopped within 90 degrees.' The co-owner stated that 'an apparent wind gust from above or behind caused the glider to nose down.' The pilot stated that 'just as the rotation stopped, the left wing tip impacted the ground.'

Factual narrative

On June 11, 1998, at 1215 mountain daylight time, a Rolladen-Schneider LS-6 glider, N511M, was substantially damaged after impacting terrain during landing at Green River Municipal Airport, Green River, Utah. The private pilot, the sole occupant onboard, was seriously injured. The glider was being operated by the owner under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the local personal flight which had originated approximately 3 minutes before the accident. No flight plan was filed.

According to the co-owner of the glider, the pilot was given an auto-tow launch from runway 13 (5,600 feet X 60 feet, elevation 4225 feet) and he believed that the pilot released at approximately 700 feet agl. The co-owner observed the glider circling southwest of the runway, losing altitude. The pilot stated that he encountered "heavy sink almost immediately after tow release." The co-owner further observed the glider fly over runway 13, but "was too high to land straight ahead." The pilot further reported that "he turned left to return to the runway and the glider began to rotate left."

The pilot told the Investigator-In-Charge (IIC) that he "got the right rudder in and the rotation stopped within 90 degrees." The co-owner stated that "an apparent wind gust from above or behind caused the glider to nose down." The pilot stated that "just as the rotation stopped, the left wing tip impacted the ground." The glider came to rest facing approximately 220 degrees. The left wing and the tail section were substantially damaged. The canopy, flight deck, and instrument panel were destroyed.

Aircraft

Registration
N511M
Reported as
Rolladen-Schneider LS-6A
Category
Glider
Serial number
6037
Airframe hours
915
Engine
unknown
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Walter J. Lafford II
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · January 1, 1998 · 55 hours before
Departed
U34
Destination
PVC · Price, UT
Airport
U34 · Green River, runway 13, 5,600 × 75 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
53
Certificate
Private
Seat
Front
Flight hours
910 total · 480 in this make and model · 860 as pilot in command · 20 in the last 90 days · 15 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
70 °F, dew point 39 °F
Altimeter
29.00 inHg
Observed at
GJT, 100 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 N511M · 1

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