IAD96LA083

NTSB accident investigation · Lithuanian Factory of LAK-12 · Woodbine, MD · May 11, 1996

Accident · No injuriesLimited investigationFinal report
Date
May 11, 1996, 15:30 local (19:30 UTC)
Place
Woodbine, MD
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N112LKLithuanian Factory of LAK-12
Weather
Visual (VMC) · Day
Status
Completed · report March 31, 1998
Report
Approved by Office Director
FAA report
19960511046599A
Case key
28055

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 decision to fly with inadequate research of forecast weather.

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 weatherDescent - normal
Weather condition - crosswindFactor
Weather condition - downdraftFactor
Weather condition - turbulenceFactor
Preflight planning/preparation - inadequatePilot in commandFactor
Loss of control - in flightLanding - flare/touchdown

Analysis

The pilot stated that his weather information was what he had heard on a weather radio in the local area. When he took off there were strong winds with scattered to broken cumulus clouds in the area. Fifteen minutes after being released by the tow airplane, he noticed the 'black wall' of the cold front quickly approaching from the west. He started an immediate descent toward the field. During his approach to the field, he encountered severe turbulence and in order to avoid an extreme crosswind landing, he decided to land diagonally across the runway into the wind. Shortly before touchdown, the pilot encountered a sudden and severe down draft causing his head to hit and break the plexiglass canopy. The glider's right wing tip then hit the ground and the glider did a 360-degree 'ground-loop'.

Factual narrative

On May 11, 1996, at 1530 eastern daylight time, a Lithuanian Sport Factory of Aviation, LAK-12 glider, N112LK, impacted the runway while attempting to land during gusty wind conditions at Woodbine Gliderport, in Woodbine, Maryland. The glider was released from the tow line at approximately 1515. The private pilot, the sole occupant, was unharmed and the glider sustained substantial damage. No flight plan had been filed and visual meteorological conditions prevailed at the time of the accident. The flight was being conducted under 14 CFR Part 91.

The pilot indicated that he obtained his weather information from a National Oceanic and Atmospheric Administration weather radio in Sterling, Virginia. The pilot stated that when he took off (Aero-tow), there were strong winds from the south with scattered to broken cumulus clouds. The pilot stated that he was released by the tow airplane at 4200 feet MSL. About 15 minutes later, the pilot stated that he became aware of the cold front (black wall) fast approaching from the west and he started an immediate descent towards the field.

During his approach to the field, the pilot stated that he encountered severe turbulence and that the winds were coming from approximately 270 degrees. The runway is oriented 03/21 degrees and is 1600 feet long by 100 feet wide. In order to avoid an extreme cross wind landing, the pilot stated that he decided to land diagonally across the runway into the wind. Shortly before touchdown at approximately 12-15 feet above the ground, the pilot stated that he encountered a sudden and severe down draft causing his head to hit and break the plexiglass canopy. The pilot stated that the glider's right wing tip then hit the ground, and the glider did a 360 degree "ground-loop" causing the damage.

Aircraft

Registration
N112LK
Reported as
Lithuanian Factory of LAK-12
Category
Glider
Serial number
6220
Airframe hours
54
Engine
unknown
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Urs Thierstein/Steve Cruise
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · August 15, 1995 · 20 hours before
Airport
PVT · Woodbine Gliderport, runway 3, 1,600 × 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
54
Certificate
Private
Medical
Unknown, Unknown
Seat
Center
Flight hours
407 total

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 30 knots, gusting 43
Visibility
5 statute miles
Temperature
70 °F

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.