ANC97LA104

NTSB accident investigation · Piper PA-18 · Gakona, AK · July 16, 1997

Accident · Minor injuriesLimited investigationFinal report
Date
July 16, 1997, 13:00 local (21:00 UTC)
Place
Gakona, AK
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N83675Piper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report May 4, 1998
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19970716018659A
Case key
3027

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 selection of unsuitable terrain for landing.

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.

Main gear collapsedLanding - flare/touchdown
Terrain condition - rough/unevenFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Nose overLanding - roll

Analysis

The pilot was landing a tailwheel and tundra tire equipped airplane on a rocky mountain ridge at 5,400 feet mean sea level. The landing area was about 600 feet long and 50 feet wide. The pilot was landing in a westerly direction and during touchdown the right main landing gear tire struck a rock. The right main landing gear collapsed, and the airplane nosed over. The pilot described the wind conditions as light and variable.

Factual narrative

On July 16, 1997, about 1300 Alaska daylight time, a tundra tire equipped Piper PA-18 airplane, N83675, crashed during landing on remote mountainous terrain, about 20 miles east of Gakona, Alaska. The airplane was being operated as a visual flight rules (VFR) on-demand passenger flight under Title 14 CFR Part 135 when the accident occurred. The airplane, registered to and operated by McMahan Guide and Flying Service, Gakona, sustained substantial damage. The certificated commercial pilot received minor injuries. The sole passenger was not injured. Visual meteorological conditions prevailed. VFR company flight following procedures were in effect. The flight originated at Gakona about 1230.

On July 16, 1997, at 1807, the pilot reported in a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), he was landing on a rocky mountain ridge of Mount Drum, at 5,400 feet mean sea level. The landing area was about 600 feet long, and 50 feet wide. The pilot was landing in a westerly direction and during the landing touch down, the right main gear tire struck a rock. The right main gear collapsed, and the airplane nosed over. The airplane received damage to the fuselage, vertical stabilizer, and rudder. The pilot described the wind conditions as light and variable.

Aircraft

Registration
N83675
Reported as
Piper PA-18
Category
Airplane
Serial number
18-7709116
Airframe hours
3,980
Engine
Lycoming O-320-A2B, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Mcmahan Guide, Flying Service
Registered owner
Harley B. Mcmahan
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · June 20, 1997 · 40 hours before
Departed
AK
Flight plan
Company VFR

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
45
Certificate
Commercial
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
25,000 total · 24,500 in this make and model · 25,000 as pilot in command · 350 in the last 90 days · 100 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Visibility
40 statute miles
Lowest ceiling
6,500 ft broken
Temperature
50 °F

FAA reports on this event · 1

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