CHI96LA110

NTSB accident investigation · Yakovlev YAK C-11 · North Vernon, IN · March 16, 1996

Accident · No injuriesLimited investigationFinal report
Date
March 16, 1996, 09:40 local (14:40 UTC)
Place
North Vernon, IN
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9YKYakovlev YAK C-11
Weather
Visual (VMC) · Day
Status
Completed · report May 29, 1996
Report
Approved by Office Director
FAA report
19960316004399A
Case key
10211

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

Failure of the pilot to maintain adequate airspeed during an aborted landing, which resulted in an inadvertent stall.

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.

Loss of control - in flightLanding - aborted
Airspeed - not maintainedPilot in commandCause
Stall - inadvertentPilot in commandCause
In flight collision with terrain/waterLanding - aborted

Analysis

The pilot said that as he was crossing the threshold for landing, he detected 'an excessive sink rate.' The pilot applied aft stick pressure and climbed to approximately 20 feet AGL, then applied power. The airplane rolled left. The left wing tip struck the terrain about 20 feet left of the runway, followed by the propeller and cowling. The airplane then 'spun in a counter-clockwise direction and fell to the ground, coming to rest with the nose pointed toward the runway, approximately 40 feet from the runway's edge.' Examination of the wreckage at the scene revealed no anomalies which contributed to the accident.

Factual narrative

On March 16, 1996, at 0940 eastern standard time (est), a Yakovlev, Yak C-11, N9YK, operated by a private pilot, sustained substantial damage when during landing at North Vernon, Indiana, the airplane impacted the terrain along side the runway. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under 14 CFR Part 91. No flight plan was on file. The pilot reported no injuries. The flight originated at Louisville, Kentucky at 0900 est.

In his written statement, the pilot said that as he was crossing the threshold for landing, at an altitude of 20 feet above ground level (AGL) and an airspeed of 100 knots, "an excessive sink rate was detected." The pilot applied aft stick pressure and climbed to approximately 20 feet AGL, then applied power. The airplane rolled left. The left wing tip struck the terrain 20 feet left of the runway, followed by the propeller and cowling. The airplane then "spun in a counter-clockwise direction and fell to the ground coming to rest with the nose pointed toward the runway, approximately 40 feet from the runway's edge."

The Federal Aviation Administration inspector who examined the wreckage at the scene found damage to both wing tips, the right main landing gear, the propeller and cowling. The forward fuselage skin, skin along the leading edges of both wings, and skin along the bottom of the fuselage showed substantial wrinkling. The right main wing spar was bent up approximately 25 degrees. Flight control continuity was confirmed. No other anomalies were found.

Aircraft

Registration
N9YK
Reported as
Yakovlev YAK C-11
Category
Airplane
Serial number
172612
Airframe hours
3,300
Engine
Shvetsov A-SH21, 720 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
William Gossmann
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · September 27, 1995 · 23 hours before
Departed
LOU · Louisville, KY
Destination
OVO
Airport
OVO · North Vernon Municipal, runway 5, 4,500 × 50 ft, concrete

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 3, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
1,249 total · 23 in this make and model · 1,249 as pilot in command · 25 in the last 90 days · 6 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
4 statute miles
Lowest ceiling
None
Temperature
45 °F
Altimeter
29.00 inHg
Observed at
BAK, 19 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.