ATL95LA080

NTSB accident investigation · Let Blanik L-13 · Brownsboro, AL · April 8, 1995

Accident · No injuriesLimited investigationFinal report
Date
April 8, 1995, 17:00 local (22:00 UTC)
Place
Brownsboro, AL
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N48039Let Blanik L-13
Weather
Visual (VMC) · Day
Status
Completed · report August 21, 1995
Report
Approved by Office Director
FAA report
19950408007409A
Case key
3547

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 NTSB’s determination of the probable cause, and any contributing factors.

The student pilot's inadvertent use of spoilers during takeoff. Factors related to the accident were: the glider instructor's failure to identify the extended spoilers, and the proximity of trees in the emergency landing area.

Analysis

The glider instructor (CFI) reported that as the glider was being towed on the takeoff roll, the student pilot accidentally activated the spoilers. After lift-off, the tow plane could not gain sufficient altitude, while towing the glider in this configuration, so the tow pilot released the glider at an altitude of about 80 feet above ground level. The instructor pilot turned the glider to avoid trees and attempted to land in a clearing; however, the wing of the glider contacted the ground. The glider then rotated about 90 degrees and slid to a stop with substantial damage.

Factual narrative

On April 8, 1995, at 1700 central daylight time, a Blanik L-13 glider, N48039, collided with the ground while maneuvering for an emergency landing following an aborted takeoff near Brownsboro, Alabama. The training flight operated under provisions of 14 CFR Part 91 with no flight plan filed. Visual weather conditions prevailed at the time of the accident. The glider sustained substantial damage; the flight instructor and student pilot were not injured. The flight departed Brownsboro at 1658 hours.

The flight instructor reported that during the takeoff roll, he was occupied assisting the student with the takeoff. He did not realize how much of the runway had been used during the takeoff roll until after the aircraft was in the air. He stated that the student was a large man, and that because of his size, his knee was located immediately under the spoiler handle. The student pilot failed to keep his hand on the spoiler handle to prevent accidental activation of the spoiler, and inadvertently deployed the spoiler with his left knee during takeoff roll as the glider was towed. Before the flight instructor could gain control of the glider, at an altitude of about 80 feet above ground level, the tow aircraft pilot released the glider. The flight instructor attempted to maneuver the glider for a landing, but the left wing collided with the ground.

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.

Miscellaneous/otherTakeoff - initial climb
Spoiler extension - inadvertent useDual studentCause
Aircraft performance,climb capability - impeded
Glider/tow release - performedPilot of other aircraft
Forced landingEmergency landing after takeoff
Spoiler extension - not identifiedPilot in command(cfi)Factor
Dragged wing,rotor,pod,float or tail/skidManeuvering - turn to landing area (emergency)
Object - tree(s)Factor
Maneuver to avoid obstructions - performedPilot in command

Aircraft

Registration
N48039
Reported as
Let Blanik L-13 (BLANIK L-1)
Category
Glider
Serial number
026102
Airframe hours
2,600
Engine
unknown
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Theodore N. Mavrotheris
Registered owner
Huntsville Soaring Club
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 28, 1995 · 25 hours before
Airport
3M5 · Moontown Airport, runway 27, 2,300 × 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
52
Certificates
Flight instructor, Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Rear
Flight hours
1,210 total · 120 in this make and model · 686 as pilot in command · 16 in the last 90 days · 15 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 48 °F
Altimeter
29.00 inHg
Observed at
HSV, 30 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.