ANC05CA139

NTSB accident investigation · Piper PA-18 · Fairbanks, AK · September 6, 2005

Accident · No injuriesData collectionFinal report
Date
September 6, 2005, 12:00 local (20:00 UTC)
Place
Fairbanks, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N1907APiper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report December 20, 2005
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20050906022439A
Case key
62444

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 adequate airspeed during takeoff initial climb, which resulted in an inadvertent stall/mush, and subsequent in-flight collision with trees. A factor contributing to the accident was a tailwind.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - in flightTakeoff - initial climb
Airspeed(vs) - not maintainedPilot in commandCause
Weather condition - tailwindFactor
Stall/mush - inadvertentPilot in command
In flight collision with objectTakeoff - initial climb
Object - tree(s)

Analysis

The private certificated pilot was departing to the north, and downhill, from a one-way landing area, about 2,000 feet msl. The area, oriented north/south, was about 400 feet long, and about 15 feet wide. The pilot indicated that he began the takeoff roll with one notch of flaps selected. The airplane lifted off and climbed to about 40 feet agl. He reported that due to what he believed to be a tailwind, the tail of the airplane felt as if it was pushed downward, raising the nose of the airplane. He lowered the nose to prevent a stall, and began raising the flaps. The airplane collided with spruce trees about 200 yards from the takeoff area, and received damage to the landing gear, stabilizer, both wings and wing lift struts.

Factual narrative

On September 6, 2005, about 1200 Alaska daylight time, a tundra tire-equipped Piper PA-18 airplane, N1907A, sustained substantial damage when it collided with trees during takeoff initial climb from a remote area, about 45 miles south-southeast of Fairbanks, Alaska. The airplane was being operated as a visual flight rules (VFR) local area personal flight under Title 14, CFR Part 91, when the accident occurred. The airplane was operated by the pilot. The private certificated pilot, and the sole passenger, were not injured. Visual meteorological conditions prevailed. No flight plan was filed, nor was one required.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on September 6, the pilot's mechanic reported that the airplane had crashed, and the pilot was remaining in the field until the airplane was recovered. On September 13, the pilot telephoned the NTSB IIC, and reported that he was departing to the north, and downhill, from a one-way landing area, about 2,000 feet msl. The area, oriented north/south, was about 400 feet long, and about 15 feet wide. He said that after the engine run-up, he began the takeoff roll with one notch of flaps selected. The airplane lifted off and climbed to about 40 feet agl, with the engine rpm indicating about 2,700.

The pilot reported that due to what he believed to be a tailwind, the tail of the airplane felt as if it was pushed downward, raising the nose of the airplane. He lowered the nose to prevent a stall, and began raising the flaps. The airplane collided with spruce trees about 200 yards from the takeoff area, and received damage to the landing gear, stabilizer, both wings and wing lift struts.

Aircraft

Registration
N1907A
Reported as
Piper PA-18
Category
Airplane
Serial number
18-1741
Engine
Lycoming O-320-A2B, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
James Knopke
Airworthiness certificate
Standard, Normal
Departed
Fairbanks, 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
49
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3
Flight hours
216 total · 212 in this make and model · 30 in the last 90 days · 25 in the last 30 days

Weather

Conditions
Visual (VMC) · Day

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 N1907A · 1

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