FTW98LA264

NTSB accident investigation · Let Blanik L-13 · Hempstead, TX · June 14, 1998

Accident · Minor injuriesLimited investigationFinal report
Date
June 14, 1998, 17:15 local (22:15 UTC)
Place
Hempstead, TX
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N73534Let Blanik L-13
Weather
Visual (VMC) · Day
Status
Completed · report February 16, 2001
Report
Approved by Office Director
FAA report
19980614013479A
Case key
20646

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 the proper rate of descent. Factor were the pilot's inadvertent lowering of the flaps instead of extending the spoilers, and his lack of experience in gliders.

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.

OverrunLanding
Lowering of flaps - inadvertentPilot in commandFactor
Lack of total experience in kind of aircraftPilot in commandFactor
Proper descent rate - not maintainedPilot in commandCause
In flight collision with objectLanding
Object - wire,static
On ground/water collision with objectLanding - roll
Object - building(nonresidential)

Analysis

When the glider was adjacent to the intended touch down point, the pilot 'took out some of the spoilers to decrease sink [rate].' After initiating a left turn to base leg he realized that the 'altitude was still much too great and attempted to deploy full spoilers.' Observers on the ground noted that 'no spoilers were deployed; rather, the flaps appeared to have been extended instead.' On final approach, the pilot lowered the nose to try and touch down on the runway, and the aircraft 'porpoised' due to the 'excessive' speed. Approximately 50 feet from the departure end of the runway and less than 15 feet agl, the pilot 'lifted the plane off the ground to avoid hitting the property fence and crossing Highway 290.' He flew the glider over the highway and forced it to the ground in a dirt parking lot. The glider came to a stop after hitting a metal building. The glider also hit a neutral power line during the landing to the parking lot. In the Blanik L-13, the handle for the spoilers is located directly underneath the handle used to deploy the flaps. The pilot stated that 'in concentrating on other factors during landing, it appears that I pulled the wrong lever.' The private pilot rated student had 7 hours total glider time.

Factual narrative

On June 14, 1998, at 1715 central daylight time, a Let Blanik L-13 glider, N73534, registered to and operated by the Greater Houston Soaring Association of Richmond, Texas, was substantially damaged while landing at the Hempstead Gliderport near Hempstead, Texas. The private pilot, the sole occupant, sustained minor injuries. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 Code of Federal Regulations (CFR) Part 91 local solo instructional flight. The flight originated from the Hempstead Gliderport at 1641.

The pilot reported in the Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1/2, and in a written statement that a "normal aero-tow was taken, and he disengaged at 3,000 feet agl." After 23 minutes, he elected to return to the gliderport. He entered left traffic for runway 17L at approximately 900 feet agl. He went through the "USTALL" checklist, lowering and locking the undercarriage, slowing to 55 knots and trimming the aircraft.

The pilot further reported that he deployed the "airbrakes [spoilers] approximately halfway and looked to the left wing to verify their deployment." About midfield on downwind, he realized that he was too high due to "substantial amount of thermal lift on the fields underneath the downwind leg," and deployed more spoilers. When the glider was adjacent to the intended touch down point, he "took out some of the spoilers to decrease sink [rate]." After initiating a left turn to base leg, he realized that the "altitude was still much too great and attempted to deploy full spoilers."

Observers on the ground noted that "no spoilers were deployed; rather, the flaps appeared to have been extended instead." In the Blanik L-13, the handle for the spoilers is located directly underneath the handle used to deploy the flaps. The pilot stated that "in concentrating on other factors during landing, it appears that I pulled the wrong lever."

The pilot also reported that the glider was not losing enough altitude, so he "lowered the nose of the plane to approach the ground. The airspeed increased substantially." On final approach, he lowered the nose to try and touch down on the runway. The aircraft "porpoised" due to the "excessive" speed of approximately 15-20 knots. Approximately 50 feet from the departure end of the runway and less than 15 feet agl, he "lifted the plane off the ground to avoid hitting the property fence and crossing Highway 290. He flew the plane over the highway and forced it to the ground in a dirt parking lot. The glider came to a stop after hitting a metal building. Although the pilot did not realize it, the glider also hit a neutral power line during the landing to the parking lot.

The pilot reported that the glider's left and right wings were sheared and that the nose cone was dented.

The pilot held a private pilot certificate with an airplane single engine land rating. On the day of the accident, the pilot received 1.1 hours dual instruction during three flights prior to solo endorsement. He had previously received 4.9 hours of dual instruction in gliders.

Aircraft

Registration
N73534
Reported as
Let Blanik L-13 (BLANIK L-1)
Category
Glider
Serial number
175214
Engine
unknown
Damage
Substantial damage
Flight
Instructional · Part 91
Registered owner
Greater Houston Soaring Assoc.
Airworthiness certificate
Standard, Normal
Departed
35R
Airport
35R · Hempstead Gliderport, runway 17, 3,055 × 50 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
17
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
81 total · 7 in this make and model · 31 as pilot in command · 4 in the last 90 days · 3 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 5 knots, gusting 10
Visibility
12 statute miles
Lowest ceiling
None
Temperature
99 °F

FAA reports on this event · 1

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