ANC01TA049

NTSB accident investigation · Piper PA-18 · King Salmon, AK · April 21, 2001

Accident · No injuriesFinal report
Date
April 21, 2001, 14:00 local (22:00 UTC)
Place
King Salmon, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N745Piper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report October 2, 2001
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA-AL-ANC FSDO 03
FAA report
20010421039979A
Case key
52116

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 inadequate compensation for wind conditions, and inadequate weather evaluation resulting in a loss of directional control during the landing roll. Factors in the accident were the presence of a quartering tailwind, and an inadvertent ground loop.

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 - on ground/waterLanding - roll
Weather condition - crosswindFactor
Compensation for wind conditions - inadequatePilot in commandCause
Weather condition - tailwindFactor
Weather evaluation - inadequatePilot in commandCause
Ground loop/swerve - inadvertentPilot in commandFactor

Analysis

The commercial certificated pilot was landing on runway 29 at an airport which was an intermediate stop on a cross-country government flight. The wind conditions were reported to the pilot as 070 degrees at 6 knots. After touchdown, the airplane veered to the left. The pilot applied right rudder and right brake pressure, but the airplane continued to the left. The right wingtip and the right aileron struck the gravel-covered ground along the left side of the runway. The wingtip was bent upward slightly, and the trailing edge of the right aileron was buckled upward. The pilot decided the airplane was airworthy, and continued the flight to his final destination.

Factual narrative

On April 21, 2001, about 1400 Alaska daylight time, a tundra tire equipped Piper PA-18 airplane, N745, sustained substantial damage during landing at the King Salmon Airport, King Salmon, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country government flight, under Title 14, CFR Part 91, when the accident occurred. The airplane was operated by the U.S. Department of Interior, U.S. Fish and Wildlife Service. The commercial certificated pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed, and VFR company flight following procedures were in effect. The flight originated at the Cold Bay Airport, Cold Bay, Alaska, about 1010.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on April 24th, an aviation investigator from the U.S. Department of Interior, Office of Aircraft Services, Boise, Idaho, reported that the pilot was bringing the airplane to Anchorage, Alaska, for maintenance. The investigator said that the pilot was landing on runway 29 at King Salmon, and the wind conditions were reported to the pilot as 070 degrees at 6 knots. After touchdown, the airplane veered to the left. The pilot applied right rudder and right brake pressure, but the airplane continued to the left. The right wingtip and the right aileron struck the gravel-covered ground along the left side of the runway. The wingtip was bent upward slightly, and the trailing edge of the right aileron was buckled upward. The pilot inspected the damage, decided the airplane was airworthy, and continued the flight to Anchorage.

At 1352, an Aviation Routine Weather Report (METAR) at King Salmon was reporting in part: Wind, calm; visibility, 10 statute miles; clouds and sky condition, 5,000 feet broken, 12,000 feet overcast; temperature, 50 degrees F; dew point, 33 degrees F; altimeter, 29.62 inHg.

Aircraft

Registration
N745
Reported as
Piper PA-18
Category
Airplane
Serial number
18-7709139
Airframe hours
4,183
Engine
Lycoming O-320-B2B, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Public aircraft · Part 91
Operator
U.S. Fish And Wildlife Service
Registered owner
Dept. Of Interior, Office Of Aircraft Services
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · May 18, 2000 · 37 hours before
Departed
PACD · Cold Bay, AK
Destination
PANC · Anchorage, AK
Flight plan
Company VFR
Airport
PAKN · King Salmon, runway 29, 8,500 × 150 ft, asphalt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
53
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
September 6, 2000
Seat
Front
Flight hours
2,676 total · 1,000 in this make and model · 2,613 as pilot in command · 23 in the last 90 days · 15 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
70° at 6 knots
Visibility
10 statute miles
Lowest ceiling
5,000 ft broken
Temperature
50 °F, dew point 34 °F
Altimeter
29.62 inHg
Observed at
PAKN

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.