ANC08LA122

NTSB accident investigation · Piper PA-18 · Talkeetna, AK · September 11, 2008

Accident · FatalLimited investigationFinal report
Date
September 10, 2008, 16:30 local (Sep 11, 2008, 00:30 UTC)
Place
Talkeetna, AK
Injuries
1 fatal, 1 serious
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N7174KPiper PA-18
Defining event
Maneuvering-low-alt flying: Aerodynamic stall/spin
Weather
Visual (VMC) · Day
Status
Completed · report September 30, 2009
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Anchorage FSDO-03
FAA report
20080910846639A
Case key
68938

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

The pilot's failure to maintain sufficient airspeed to preclude a stall while maneuvering at a low altitude, resulting in an uncontrolled descent and collision with terrain.

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.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18: 5 casesAll aircraft: 1,681 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-18: 21 casesAll aircraft: 9,295 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 commercial pilot was on a Title 14, CFR Part 91, local area passenger flight in conjunction with his hunting/guiding business. The flight was to include landing at remote off airport sites. According to the surviving passenger, he and the pilot headed for a remote area to look for caribou. He said they were circling to the left looking for a likely camp site. He said the turn became tighter, and the angle of bank became steeper. The passenger said the angle of bank suddenly became very steep, and he heard the pilot say something like "Oh No!" over the intercom. He said he looked forward, and saw the ground through the front windscreen. The passenger said the airplane's left wing struck the ground first, followed by the nose. A fire erupted, and after putting out the fire and attempting to help the pilot, the passenger said he headed toward a camp they had seen from the air to get help. According to the passenger there were no known mechanical anomalies with the airplane prior to the accident. Given the absence of any mechanical issues with the airplane, the steep bank, and sudden decrease in pitch attitude, it is likely the pilot inadvertently stalled the airplane during the turn.

Factual narrative

On September 10, 2008, about 1630 Alaska daylight time, a Piper PA-18 airplane, N7174K, sustained substantial damage during an in-flight collision with terrain and postcrash fire, about 40 miles east of Talkeetna, Alaska. The airplane was being operated by the pilot as a visual flight rules (VFR), local other work use flight, in conjunction with his hunting guide business, under Title 14, CFR Part 91, when the accident occurred. The commercial pilot received fatal injuries, and the sole passenger received serious injuries. Visual meteorological conditions prevailed, and no flight plan was filed. The airplane departed the Talkeetna Airport, Talkeetna, about 1600. The airplane was reported overdue on September 10, when it failed to return to Talkeetna for a second passenger. Weather and darkness precluded a search of the area until September 11. On September 11, searchers located the airplane's wreckage, and the deceased pilot. The search continued for the passenger, until he was located about 5 miles from the accident site, trying to find help. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on September 12, the passenger said he and the pilot took off from the Talkeetna Airport looking for caribou to hunt, and a site to setup a hunting camp. He said they were about 40 miles east of Talkeetna, and started to circle a likely camp site. He said the airplane was in a left circling turn, and the turn became tighter, and the angle of bank became steeper. The passenger said at one point the angle of bank suddenly became very steep, and he heard the pilot say something like "Oh No!" over the intercom. He said he had been looking out the left side of the airplane, and the airplane was in a steep bank to the left. When he looked forward, he saw the ground. The passenger said the airplane's left wing struck the ground first, followed by the nose. He said the next thing he remembered was being outside the airplane, trying to put out the fire on himself, and then the pilot. He said his efforts to help the pilot, after extinguishing the fire, were in vain. He spent the night at the airplane, and when nobody came in the morning, he headed in the direction of a camp about 10 miles away. He said there were no problems with the airplane prior to the accident. Attempts by the IIC to reach the accident site on September 16 and 19 were canceled due to weather, and due to approaching winter storms no further attempts to reach the site were made. The airplane has not been examined by the NTSB. The accident site is located on a ridge in steep mountainous terrain bounded on two sides by rivers/creeks. Aerial photographs of the airplane taken from a search aircraft while looking for the missing passenger, showed the airplane impacted in a steep descent. The impact site appeared small in diameter, with no discernible horizontal component. All of the airplane's major components appeared to be at the site. Anexamination of the airplane's logbooks showed an annual inspection was performed on April 1, 2008, and no mechanical anomalies were noted. No personal pilot records were discovered for examination. According to FAA medical records, the latest application for an FAA medical certificate dated February 23, 2007, showed the pilot received an FAA third class medical certificate that date, and reported 2,000 hours of total flying experience. An autopsy performed by the Alaska State Medical Examiner showed the cause of death was blunt force trauma resulting from an airplane crash. Toxicological examination of tissue samples performed by the FAA Civil Aeromedical Institute (CAMI) in Oklahoma City, Oklahoma, were negative.

Aircraft

Registration
N7174K
Reported as
Piper PA-18
Category
Airplane
Serial number
18-393
Airframe hours
3,503
Engine
Lycoming O-320 SERIES, 180 horsepower, reciprocating
Damage
Substantial damage
Fire
On-Ground
Flight
Other work use · Part 91
Operator
Dinello Frank A
Registered owner
Dinello Frank A
Airworthiness certificate
Standard, Normal
Last inspection
Annual · April 1, 2008
Departed
PATK · Talkeetna, 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
48
Injuries
Fatal
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Seat
Front
Toxicology
Performed
Flight hours
2,000 total

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 43 °F
Altimeter
29.30 inHg
Observed at
PATK, 40 nm away

Docket · 3

The files NTSB released with the investigation on September 9, 2009, on NTSB’s docket system: statements, records, photos and specialists’ reports. 261 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 N7174K · 2

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