CEN11CA532

NTSB accident investigation · Alon A-2A · Rolfe, IA · July 31, 2011

Accident · No injuriesData collectionFinal report
Date
July 31, 2011, 12:30 local (17:30 UTC)
Place
Rolfe, IA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N5647FAlon A-2A
Defining event
Enroute-cruise: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Completed · report October 17, 2011
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA-DSM-FSDO
FAA report
20110731016069A
Case key
81325

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot's decision to execute a precautionary landing to unsuitable terrain.

Findings · 3

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 equipmentAlon A-2A: 1 caseAll aircraft: 435 cases
Planning/preparationPersonnel issues › Task performance · PilotAlon A-2A: 1 caseAll aircraft: 113 casesProbable cause
Object/animal/substanceEnvironmental issues › Physical environment · Effect on equipmentAlon A-2A: 1 caseAll aircraft: 224 cases

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 applied carburetor heat twice during the flight to regain engine power. Following the second application of carburetor heat, he was not confident that the engine was producing full power and he elected to make a precautionary landing on a road; however, during the landing approach he noted power lines and a fence bordering the road. The pilot decided the road was not suitable for landing. Concerned that the engine was not performing well enough to execute a go-around, the pilot elected to continue the landing into a nearby cornfield. The airplane contacted the corn crop, a ditch, and a fence during the landing resulting in substantial damage to the wings and firewall. According to the Federal Aviation Administration icing probability chart, the airplane was operating in conditions conducive to carburetor icing at glide and cruise power at the time of the accident.

Factual narrative

The pilot reported that the engine began to lose power during cruise flight. He applied carburetor heat and engine power was restored. Approximately 5 minutes later, the engine again began to lose power. The pilot applied carburetor heat and the engine power increased; however, the pilot was concerned the engine was not developing full power. He elected to make a precautionary landing on a road, but during the landing approach he noted power lines and a fence bordering the road. The pilot decided the road was not suitable for landing. Concerned that the engine was not performing well enough to execute a go-around, the pilot elected to continue the landing into a nearby cornfield. The airplane contacted the corn crop, a ditch, and a fence during the landing resulting in substantial damage to the wings and firewall. According to the Federal Aviation Administration icing probability chart, with the temperature and dew point, 84 degrees Fahrenheit and 75 degrees Fahrenheit respectively, conditions were conducive for carburetor ice at glide and cruise power.

Aircraft

Registration
N5647F
Reported as
Alon A-2A
Category
Airplane
Serial number
B-247
Engine
Continental C90, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Howell Jan J
Registered owner
Howell Jan J
Airworthiness certificate
Standard, Normal
Last inspection
Annual · January 1, 2011 · 20 hours before
Departed
CCY · Charles City, IA
Destination
CKP · Cherokee, IA

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
76
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
February 7, 2011
Seat
Left
Flight hours
2,375 total · 300 in this make and model · 15 in the last 90 days · 10 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
170° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 75 °F
Altimeter
30.11 inHg
Observed at
FOD, 25 nm away

Docket · 2

The files NTSB released with the investigation on September 7, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 779 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.

Other investigations on N5647F · 1

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