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Aviation safety reports, made easier to study

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NTSB Report

July 6, 2012 · Piper PA-12 · N7779H

Quinhagak, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
July 6, 2012
Injury Outcomes
No injuries (2 uninjured)
Location
Quinhagak, AK
Aircraft
Piper PA-12
Tail Number
N7779H
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC12CA072

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.

NTSB 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.

Full 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.

Flight

Event TypeAccident
Event Time09:05 AKDT
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo

Aircraft

AircraftPiper PA-12
Tail NumberN7779H
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 SERIES · Reciprocating · 160
Seats3

People & Injuries

Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 56 · Third Class · None

Conditions

ConditionsVMC
LightDaylight
Wind350°
Visibility10 sm
CeilingBroken clouds 1200 ft
Temperature / Dew Point45 C / 43 C
Altimeter0
Weather SourcePILO

Appendix: Source Data