CEN10LA416

NTSB accident investigation · Piper J3C-65 · Krum, TX · July 14, 2010

Accident · Minor injuriesLimited investigationFinal report
Date
July 13, 2010, 20:30 local (Jul 14, 2010, 01:30 UTC)
Place
Krum, TX
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N35645Piper J3C-65
Defining event
Maneuvering: Loss of engine power (total)
Weather
Visual (VMC) · Dusk
Status
Completed · report April 7, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20100713040759A
Case key
76696

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 total loss of engine power in flight due to carburetor icing.

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.

Temp/humidity/pressure: conducive to carburetor icingEnvironmental issues › Conditions/weather/phenomena · Effect on equipmentPiper J3C-65: 8 casesAll aircraft: 435 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 was practicing flight maneuvers near his home field over and around a lake. He reduced the engine's power to idle while performing a descending turn and then attempted to add power to bring the airplane to a level attitude. The engine experienced a total loss of power and the airplane's altitude was too low for the pilot to reach the shoreline. The pilot performed a forced landing into the lake, resulting in substantial damage to the left wing and aileron. The pilot reported no mechanical malfunctions with the airplane and opined that the loss of engine power was due to carburetor icing. A postaccident examination by a Federal Aviation Administration inspector did not reveal any evidence of a preimpact anomaly. A review of a carburetor icing chart located in Special Airworthiness Information Bulletin CE-09-35 revealed that the airplane was operating in an area that was conducive to serious icing at glide power.

Factual narrative

On July 13, 2010, approximately 2030 central daylight time, a Piper J3C-65, N35645, was substantially damaged during a forced landing to a body of water following a loss of engine power near Krum, Texas. The private pilot and airline transport pilot rated passenger on board sustained minor injuries. Visual meteorological conditions prevailed and no flight plan was filed for the Title 14 Code of Federal Regulations Part 91 personal flight. The local flight departed Bird Dog Airfield (TE58), Krum, Texas, approximately 1930. In an interview with the pilot and from his provided written statement, the pilot said he and his passenger had been practicing flight maneuvers in the local area. Before landing the pilot overflew a small lake. The pilot stated he began a slight descending turn with the power near idle. When he went to add power, the engine did not respond. During the loss of engine power, the pilot reported that the engine did not run rough or make any unusual sounds. The airplane was still over the water and the pilot did not think he could make land, so he performed a forced landing in the lake. The left wing was damaged upon impact with the water. The pilot stated there were no known malfunctions with his airplane and he attributed the loss of engine power to carburetor icing. An on-scene inspection of the airplane's engine ans other systems by a responding Federal Aviation Administration (FAA) inspector did not reveal any pre-impact anomalies. A review of the carburetor icing chart located in the FAA Special Airworthiness Information Bulletin CE-09-35, dated June 30, 2009, revealed that the airplane was operating in an area that was conducive for the production of serious icing at glide power.

Aircraft

Registration
N35645
Reported as
Piper J3C-65
Category
Airplane
Serial number
6503
Airframe hours
4,849
Engine
Continental A-65-8, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal; Standard, Utility
Last inspection
Annual · February 1, 2010 · 18 hours before
Departed
TE58 · Bird Dog, TX
Destination
TE58 · Bird Dog, TX

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
52
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
December 19, 2008
Seat
Left
Flight hours
341 total · 159 in this make and model · 274 as pilot in command · 10 in the last 90 days · 3 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dusk
Wind
160° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
86 °F, dew point 73 °F
Altimeter
29.85 inHg
Observed at
KDTO, 11 nm away

Docket · 2

The files NTSB released with the investigation on October 26, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 492 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.