ERA09CA171

NTSB accident investigation · Cessna 120 · Woodstock, GA · January 12, 2009

Accident · No injuriesData collectionFinal report
Date
January 12, 2009, 16:30 local (21:30 UTC)
Place
Woodstock, GA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N57NCessna 120
Defining event
Approach-VFR pattern final: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Completed · report June 11, 2009
Report
Approved by Office Director
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
Case key
73385

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

A loss of engine power, as reported by the pilot, for undetermined reasons.

Findings · 1

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.

Not determinedNot determined › Not determined · Unknown/Not determinedCessna 120: 7 casesAll aircraft: 2,247 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

While on the base leg of the traffic pattern, the pilot states that he applied carburetor heat and reduced the engine power to idle. He reported that when he turned onto the final leg, the airplane was lower than he wanted it be and that he advanced the throttle control, but the engine did not respond. The airplane subsequently struck trees prior to the runway and then impacted the ground. Both wings and the fuselage were substantially damaged. The National Transportation Safety Board was notified of the accident by the pilot about 1 month after the accident. Examination of the airplane by a Federal Aviation Administration inspector was conducted about 6 weeks after the accident and did not reveal evidence of any preaccident malfunctions. A weather report from an airport located about 9 miles northeast of the accident site about the time of the accident indicated a temperature of 9 degrees Celsius (C) and a dew point of -7 degrees C.

Factual narrative

The pilot was landing the Cessna 120, on a 2,000-foot-long, turf runway, at a private airport. While on the base leg of the traffic pattern, he applied carburetor heat and reduced the engine power to idle. The pilot reported that when he turned onto the final leg, the airplane was lower than he wanted it be and he advanced the throttle control; however, the engine did not respond. The airplane subsequently struck trees prior to the runway, and then impacted the ground. Both wings and the fuselage were substantially damaged. The National Transportation Safety Board was notified of the accident by the pilot, about 1 month after the accident. Examination of the airplane by a Federal Aviation Administration inspector was conducted about 6 weeks after the accident, and did not reveal evidence of any preaccident malfunctions. The weather reported at an airport located about 9 miles northeast of the accident site; about the time of the accident, included a temperature of 9 degrees Celsius C, and a dew point of -7 degrees C.

Aircraft

Registration
N57N
Reported as
Cessna 120
Category
Airplane
Serial number
11996
Airframe hours
5,623
Engine
Cont Motor C85 SERIES, 85 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Kobs Edward J
Registered owner
Kobs Edward J
Airworthiness certificate
Standard, Normal
Last inspection
Annual · December 2, 2008 · 1 hours before
Departed
CZL · Dalton, GA
Destination
5GA4 · Woodstock, GA
Airport
5GA4 · Air Acres, runway 18, 2,000 × 100 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
66
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
July 31, 2006
Seat
Left
Flight hours
1,650 total · 100 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
48 °F, dew point 19 °F
Altimeter
30.19 inHg
Observed at
RYY, 9 nm away

Other investigations on N57N · 1

Matched to the same aircraft by N-number and date.