ANC07CA005

NTSB accident investigation · Letecky Zavody L-23 Super Blanik · Chugiak, AK · October 10, 2006

Accident · No injuriesData collectionFinal report
Date
October 9, 2006, 18:33 local (Oct 10, 2006, 02:33 UTC)
Place
Chugiak, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N394BALetecky Zavody L-23 Super Blanik
Weather
Visual (VMC) · Day
Status
Completed · report February 26, 2007
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20061009024949A
Case key
64830

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 control of the glider while landing in gusty crosswind conditions, which resulted in a hard landing and structural damage to the fuselage. Factors associated with the accident were turbulence, a crosswind and wind gusts, and the pilot's inadequate evaluation of the weather conditions.

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.

Hard landingLanding - flare/touchdown
Weather condition - gustsFactor
Weather condition - crosswindFactor
Aircraft control - not maintainedPilot in commandCause
Weather condition - turbulenceFactor
Weather evaluation - inadequatePilot in commandFactor
Terrain condition - runway

Analysis

The private pilot reported he was attempting to land a glider in a strong and gusty crosswind. He had departed the same airport about 1.5 hours earlier on a personal, Title 14, CFR Part 91 flight. At the time of his departure, there was an active SIGMET for forecast and reported severe turbulence, as well as strong surface winds reported at adjacent airports. Upon his return, he stated that the surface winds and turbulence had increased significantly, and he estimated a 50 degree crosswind at 15 knots, with gusts to 29 knots. During the landing attempt he continued to encounter turbulence, and reported that the glider landed hard on the nose, resulting in structural damage to the forward fuselage and empennage. In his written report to the NTSB, the pilot noted, in part, that the difficulty in controlling the glider during landing was most likely exacerbated by his less than optimal use of the dive brakes, and that flights into such conditions should only be attempted by very experienced pilots

Factual narrative

The private pilot reported that he was attempting to land a glider in a strong and gusty crosswind. He had departed the same airport about 1.5 hours earlier on a personal, Title 14, CFR Part 91 flight. At the time of his departure, there was an active SIGMET for forecast and reported severe turbulence, as well as strong surface winds reported at adjacent airports. Upon his return, he stated that the surface winds and turbulence had increased significantly, and he estimated a 50 degree crosswind at 15 knots, with gusts to 29 knots. During the landing attempt he continued to encounter turbulence, and reported that the glider landed hard on the nose, resulting in structural damage to the forward fuselage and empennage. In his written report to the NTSB, the pilot noted, in part, that the difficulty in controlling the glider during landing was most likely exacerbated by his less than optimal use of the dive brakes, and that flights into such conditions should only be attempted by very experienced pilots

Aircraft

Registration
N394BA
Reported as
Letecky Zavody L-23 Super Blanik
Category
Glider
Serial number
01900Z
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Civil Air Patrol
Airworthiness certificate
Standard, Utility
Last inspection
Annual · March 1, 2006
Departed
BCV · Chugiak, AK
Destination
Chugiak, AK
Flight plan
Company VFR
Airport
BCV · Birchwood, runway 19R

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
Airplane ratings
Single-engine land
Medical
Class 2
Flight hours
272 total · 26 in this make and model · 18 in the last 90 days · 13 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
140° at 15 knots, gusting 29

FAA reports on this event · 1

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