CEN11LA575

NTSB accident investigation · Cessna 150H · Sabetha, KS · August 14, 2011

Accident · Minor injuriesLimited investigationFinal report
Date
August 14, 2011, 08:00 local (13:00 UTC)
Place
Sabetha, KS
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N6953SCessna 150H
Defining event
Approach-VFR pattern final: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report December 27, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA Flight Standards District Office
FAA report
20110814024729A
Case key
81493

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 adequate airspeed, which resulted in a stall. Contributing to the accident was the pilot's lack of certification to act as a pilot and his lack of recent experience.

Findings · 4

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.

Experience/qualifications: qualification/certificationPersonnel issues › Experience/knowledge · PilotCessna 150H: 1 caseAll aircraft: 280 casesProbable cause
Experience/qualifications: recent experiencePersonnel issues › Experience/knowledge · PilotCessna 150H: 1 caseAll aircraft: 76 casesProbable cause
Action: incorrect action selectionPersonnel issues › Action/decision · PilotCessna 150H: 4 casesAll aircraft: 397 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 150H: 4 casesAll 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

According to witnesses, the airplane stalled four times while on final approach; the airplane would pull up, and then the nose would drop. The airplane finally nosed over from an altitude of 35 to 40 feet and impacted terrain. The pilot did not hold a valid pilot certificate and had been denied medical certification for, among other things, bilateral cataracts. The pilot reported no flight time in the preceding 90 days, and additionally reported that the airplane had no mechanical malfunctions or failures prior to the accident.

Factual narrative

On August 15, 2011, at 1038 central daylight time, a Cessna 150H, N6953S, impacted terrain during takeoff from Sabetha Municipal Airport (K83), Sabetha, Kansas. The private pilot and passenger received minor injuries. The airplane sustained substantial damage to both wings. The airplane was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight was originating from K83. In his accident report, the 84-year-old pilot said that he had a heart valve replacement in early May 2011. Not wanting to pay unnecessary hangar rent, he decided to fly his airplane to his farm, where he had a 2,500-foot grass runway and a hangar. Lacking recent landing experience on grass runways, he aborted the landing attempt and returned to Sabetha. On his accident report, the pilot did not indicate there had been an accident. In addition, he indicated that there were no preimpact mechanical malfunctions or failures with the airplane. He indicated he had logged 70 hours total time, 45 hours as pilot-in-command, but no flight time in the previous 90 days. A witness saw the airplane as it approached the airport. He said the airplane would stall and the nose would drop, and the airplane would lose altitude. Then the nose would come up and the airplane would climb, then stall again. These oscillations occurred about four times and the airplane continuously lost altitude. The airplane stalled from an altitude of about 35 to 40 feet, impacted the ground, and nosed over. A Federal Aviation Administration inspector said the pilot did not hold a valid pilot certificate. He had been granted special medical authorizations in October 2006 and December 2007, but was denied medical certification in July of 2008. Denial was based upon, among other things, bilateral cataracts.

Aircraft

Registration
N6953S
Reported as
Cessna 150H
Category
Airplane
Serial number
15067653
Airframe hours
4,500
Engine
Continental O-200-A, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Alvin R. Wenger
Registered owner
Alvin R. Wenger
Airworthiness certificate
Standard, Normal
Departed
K83 · Sabetha, KS
Destination
K83 · Sabetha, KS
Flight plan
Unknown
Airport
K83 · Sabetha Municipal

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
84
Injuries
None
Certificate
Student
Medical
Class 3
Seat
Left
Flight hours
70 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
350° at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F, dew point 63 °F
Altimeter
30.11 inHg
Observed at
STJ

Docket · 4

The files NTSB released with the investigation on November 23, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.2 MB 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.