- Date
- July 6, 2012, 09:05 local (17:05 UTC)
- Place
- Quinhagak, AK
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Initial climb
- Aircraft
- N7779HPiper PA-12
- Defining event
- Initial climb: Loss of engine power (partial)
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 26, 2012
- Report
- Approved by Office Director
- NTSB office
- Alaska Regional Office
- Parties
- FAA Anchorage FSDO
- FAA report
- 20120706013499A
- Case key
- 84257
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 continuous carburetor heat while operating in conditions conducive to carburetor icing, which resulted in the development of carburetor ice and a subsequent partial loss of engine power.
Findings · 2
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.
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 stated that he was landing his tailwheel-equipped airplane at an off-airport site. During the landing roll, he aborted the landing but was unable to clear terrain at the departure end of the site, about 400 feet from where he aborted the landing. The airplane impacted the ground, sustaining substantial damage to both wings and the fuselage. The pilot indicated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation. In his written statement to the NTSB, the pilot stated that the engine may not have been producing full power but, if so, he did not realize it or take any corrective action, such as applying carburetor heat. In a telephone conversation, he said that he had been flying at reduced power settings during his reconnaissance passes, with occasional use of carburetor heat to clear any possible carburetor ice. He also stated that his normal before-landing procedure is to turn off the carburetor heat on short final. According to a carburetor icing probability chart, an airplane operating in the ambient conditions at the accident site, as reported by the pilot, could expect a serious risk of carburetor icing while at cruise power.
Factual narrative
In a telephone conversation with the National Transportations Safety Board (NTSB) investigator-in-charge just after the accident, the pilot stated that he was landing his tailwheel-equipped airplane at an off-airport site. During the landing roll he aborted the landing, but he was unable to clear terrain at the departure end of the site, about 400 feet from where he aborted the landing. The airplane impacted terrain, sustaining substantial damage to both wings, and the fuselage. The pilot indicated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation. In his written statement to the NTSB, the pilot stated that the engine may not have been producing full power, but he did not realize it, or take any corrective action for application of carburetor heat. In a telephone conversation on August 23, he said had been flying at reduced power settings during his reconnaissance passes, with occasional use of carburetor heat to clear any possible carburetor ice. He also stated that his normal before-landing procedure is to turn off the carburetor heat on short final. According to a carburetor icing probability chart, an airplane operating in the ambient conditions at the accident site, reported by the pilot, could expect serious carburetor icing while at cruise power.
Aircraft
- Registration
- N7779H
- Reported as
- Piper PA-12
- Category
- Airplane
- Serial number
- 12-677
- Airframe hours
- 4,390
- Engine
- Lycoming O-320 SERIES, 160 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · June 28, 2012 · 9 hours before
- Departed
- Togiak, AK
- Destination
- Quinhagak, AK
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
- 56
- Injuries
- None
- Certificate
- Commercial
- Airplane ratings
- Multi-engine land, Single-engine sea, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 3, With waivers/limitations
- Last flight review
- September 23, 2010
- Seat
- Front
- Flight hours
- 6,304 total · 3,450 in this make and model
Weather
- Conditions
- Visual (VMC) · Day
- Visibility
- 10 statute miles
- Lowest ceiling
- 1,200 ft broken
- Temperature
- 45 °F, dew point 43 °F
Docket · 3
The files NTSB released with the investigation on October 5, 2012, on NTSB’s docket system: statements, records, photos and specialists’ reports. 697 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.