ERA18TA059

NTSB accident investigation · Cessna 172 · Union Mills, NC · December 24, 2017

Accident · Minor injuriesFinal report
Date
December 24, 2017, 15:00 local (20:00 UTC)
Place
Union Mills, NC
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N91SPCessna 172
Defining event
Approach: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Completed · report July 8, 2019
Report
Approved by Office Director
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20171224018669A
Case key
96538

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 failure to use carburetor heat in weather conditions conducive to serious carburetor icing, which resulted in a total loss of engine power and a subsequent forced landing.

Findings · 5

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 equipmentCessna 172N: 6 casesAll aircraft: 435 casesProbable cause
Use of equip/info: use of equip/systemPersonnel issues › Task performance · PilotCessna 172N: 10 casesAll aircraft: 1,391 casesProbable cause
Ice/rain protection system: intake anti-ice, deiceAircraft › Aircraft systems · Not used/operatedCessna 172N: 1 caseAll aircraft: 108 casesProbable cause
Action: lack of actionPersonnel issues › Action/decision · PilotCessna 172N: 10 casesAll aircraft: 792 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Contributed to outcomeCessna 172N: 14 casesAll aircraft: 933 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 commercial pilot was practicing landing approaches to a private airstrip that he was constructing. According to the pilot, while flying about treetop height with full flaps deployed, he added full power to initiate a climb; the engine "sputtered" and stopped producing power. He then performed a forced landing to the unimproved airstrip. During the landing, the airplane "bounced," departed the side of the cleared area, entered the woods, and sustained substantial damage. When asked about the performance and handling of the airplane, the pilot said it was "perfect." He stated that the reason for the loss of engine power was carburetor ice and that he had not used carburetor heat for the low approach and pass over the airstrip. The weather conditions in the area at the time of the accident were conducive to serious icing at cruise power. Therefore, it is likely that the pilot's failure to use carburetor heat resulted in an accumulation of ice within the carburetor that led to a total loss of engine power.

Factual narrative

On December 24, 2017, about 1500 eastern standard time, a Cessna 172N, N91SP, was substantially damaged during a forced landing in Union Mills, North Carolina. The commercial pilot, who was also the owner of the airplane, sustained minor injuries. Visual meteorological conditions prevailed, and no flight plan was filed for the personal flight conducted under the provisions of Title 14 Code of Federal Regulations Part 91.According to the pilot, the purpose of the flight was to perform approaches to the private airstrip that he was constructing on his property. He said the performance and handling of the airplane was "perfect" throughout the flight, and that he performed multiple low approaches successfully, with no anomalies noted. The pilot said the airplane was travelling slowly over his strip, about treetop height, with full flaps deployed. When he added full power to initiate a climb, the engine "sputtered" and stopped producing power. He performed a forced landing to the unimproved strip, "bounced" and departed the side of the cleared area where the airplane entered the woods and was substantially damaged. When asked about the performance and handling of the airplane, the pilot said it was "perfect" and volunteered that the reason for the loss of engine power was carburetor ice. When asked if he had deployed the carburetor heat for the low approach and pass over his property, he said "No." The pilot held a commercial pilot certificate with ratings for airplane single engine land, and instrument airplane. His most recent Federal Aviation Administration (FAA) second-class medical certificate was issued March 15, 2016. He reported 6,700 total hours of flight experience of which 3,400 were in the accident airplane make and model. According to FAA records, the airplane was manufactured in 1978. Its most recent annual inspection was completed November 12, 2017, at 9,034.9 total aircraft hours. At 1505, the weather reported at Rutherford County Airport (FQD), 7 miles east of the site, included an overcast ceiling at 2,200 ft, 10 miles visibility, and calm winds. The temperature was 10° C, the dew point was 5° C, and the altimeter setting was 29.97 inches of mercury. According to an FAA carburetor icing probability chart, the atmospheric conditions at the time of the accident were conducive to "serious icing" at cruise power.

Aircraft

Registration
N91SP
Reported as
Cessna 172 (N)
Category
Airplane
Serial number
17271100
Built
1978
Airframe hours
9,034.9
Engine
Lycoming O-360 SERIES, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 12, 2017
Departed
Union Mills, NC
Destination
Union Mills, NC
Equipment
Unknown

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
58
Injuries
Minor
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Seat
Left
Restraint
3-point
Flight hours
6,700 total · 3,400 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
2,200 ft overcast
Temperature
50 °F, dew point 41 °F
Altimeter
29.96 inHg
Observed at
KFQD, 7 nm away

Docket · 4

The files NTSB released with the investigation on April 4, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.6 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.