ANC98LA142

NTSB accident investigation · Cessna 170B · Port Alsworth, AK · September 5, 1998

Accident · No injuriesLimited investigationFinal report
Date
September 5, 1998, 15:00 local (23:00 UTC)
Place
Port Alsworth, AK
Injuries
1 uninjured
Damage
Destroyed
Phase of flight
Taxi
Aircraft
N4368MCessna 170B
Weather
Visual (VMC) · Day
Status
Completed · report March 30, 2000
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19980905022779A
Case key
43880

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 solo student pilot's excessive application of brakes during taxi from landing. Factors associated with the accident were the pilot's selection of unsuitable terrain for a precautionary landing, rough terrain, and the fuel leak from the fuel tank vent.

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.

Nose overTaxi - from landing
Precautionary landing - performedPilot in command
Terrain condition - rough/unevenFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandFactor
Brakes(normal) - excessivePilot in commandCause
FireOther
Fuel system,vent - leakFactor

Analysis

The solo student pilot was on a cross country training flight. He stated that the airplane had been experiencing symptoms of carburetor ice, so he decided execute an off airport landing on a ridgetop gravel landing site to inspect the engine. The winds were light and variable. After landing, the tires hit a rut, he applied brakes, and the airplane nosed over. He indicated that fuel ran out of the tank vent, located just above the windscreen, and down over the engine. The airplane caught fire and was destroyed. The Emergency Locator Transmitter was consumed in the fire, and he was rescued the following day.

Factual narrative

On September 5, 1998, about 1500 Alaska daylight time, a Cessna 170B airplane, N4368M, was destroyed when it nosed over during landing at an off airport landing site 40 miles northwest of Port Alsworth, Alaska. The solo student pilot was not injured. The flight was conducted under 14 CFR Part 91 as a student solo cross country training flight. The flight departed from Nikiski, Alaska, about 1130, for Port Alsworth. Visual meteorological conditions prevailed at the time of the accident, and no flight plan was filed.

The pilot told the NTSB investigator-in-charge during a telephone interview on September 9, that during the flight he encountered repeated episodes of carburetor icing, which cleared up with application of carburetor heat. He decided to land on a ridgetop off airport landing site to inspect the airplane's carburetor heat control, and drain some fuel. The pilot reported winds to be light and variable. During taxi after landing, the airplane's tires struck a rut, the pilot applied brakes, and the airplane nosed over. Fuel ran out of the fuel tank vents onto the engine, and the airplane immediately caught fire. The fire destroyed the airplane.

The pilot indicated that he retrieved some survival equipment from the airplane before it was consumed, but was unable to reach the Emergency Locator Transmitter. The following day he saw some hunters, who ferried him to Port Alsworth.

Aircraft

Registration
N4368M
Reported as
Cessna 170B
Category
Airplane
Serial number
26685
Airframe hours
4,506
Engine
Continental O-300A, 145 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Instructional · Part 91
Operator
Craig M. Dominick
Registered owner
Peninsula Lawn Care, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · January 19, 1998 · 20 hours before
Departed
Nikiski-Mcgahan, AK
Destination
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
28
Certificate
Student
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
150 total · 150 in this make and model · 150 as pilot in command · 20 in the last 90 days · 10 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
40 statute miles
Lowest ceiling
None
Temperature
55 °F

FAA reports on this event · 1

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