CEN09CA475

NTSB accident investigation · Glasflugel Standard Libelle · Faribault, MN · July 26, 2009

Accident · Minor injuriesData collectionFinal report
Date
July 26, 2009, 17:25 local (22:25 UTC)
Place
Faribault, MN
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N3872Glasflugel Standard Libelle
Defining event
Approach-VFR pattern final: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed · report December 15, 2009
Report
Approved by Office Director
NTSB office
Central Region
FAA report
20090726048419A
Case key
74397

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 inability to maintain proper airspeed on approach to land.

Findings · 2

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedGlasflugel STANDRD LIBELLE 201B: 1 caseAll aircraft: 1,681 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported no anomalies with the glider's flight controls during the preflight inspections that preceded two flights on the day of the accident. The first flight was 40 minutes in duration and no anomalies were noted with the glider. The second flight, which was the accident flight, was about 2 1/2 hours in duration. When the pilot completed a before-landing check of the dive brakes, the closure of the dive brakes was normal. During the downwind leg of the approach, the dive brakes were extended and locked in place. The pilot stated that during the dive brake extension, they "seemed difficult to open, as sometimes happens" in the accident glider. The pilot stated that the dive brakes could not be retracted during the approach and that she had to fly a closer traffic pattern to land on the runway, resulting in a steep approach. The right wing tip struck the ground and the glider experienced a hard landing on the grass landing area adjacent to Runway 30. Damage to the glider included a fuselage separation several feet forward of the empennage, resulting in substantial damage. Postaccident photos of the glider show the dive brakes retracted. The pilot received minor injuries. The pilot stated the dive brakes operated normally after the accident.

Factual narrative

The pilot reported no anomalies with the glider's flight controls during preflight inspections that preceded two flights on the day of the accident. The first flight was 40 minutes in duration and no anomalies were noted with the glider. The second flight, which was the accident flight, was about 2 1/2 hours in duration during which the the pilot completed a before landing check of the dive brakes. The closure of the dive brakes during the check was described as normal. During the downwind leg of the approach, the dive brakes were extended and locked in place. The pilot stated that during the dive brake extension, they "seemed difficult to open, as sometimes happens" in the accident glider. The pilot stated the dive brakes could not be retracted during the approach and that she had to fly a closer traffic pattern to land on the runway resulting in a steep approach. The right wing tip struck the ground and the glider experienced a hard landing on the grass landing area adjacent to runway 30. Damage to the glider included a fuselage separation several feet forward of the empennage and towards the lateral direction resulting in substantial damage. Post accident photos of the glider show the dive brakes retracted. The pilot received minor injuries. The pilot stated the dive brakes operated normally after the accident.

Aircraft

Registration
N3872
Reported as
Glasflugel Standard Libelle
Category
Glider
Serial number
218
Airframe hours
1,834
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Pilot
Registered owner
Pilot
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 8, 2008
Departed
FBL · Faribault, MN
Destination
FBL · Faribault, MN
Airport
FBL · Faribault Municipal Airport, runway 30, 4,254 × 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
59
Injuries
Minor
Certificate
Commercial
Airplane ratings
Single-engine land
Last flight review
April 28, 2009
Seat
Single
Flight hours
1,749 total · 279 in this make and model · 1,496 as pilot in command · 21 in the last 90 days · 3 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
280° at 9 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 57 °F
Altimeter
29.92 inHg
Observed at
FBL

Docket · 3

The files NTSB released with the investigation on September 23, 2009, on NTSB’s docket system: statements, records, photos and specialists’ reports. 857 KB in all.

FAA reports on this event · 1

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