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September 2, 1994 · Piper PA-18 · N8597D

Tok, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
September 2, 1994
Injury Outcomes
No injuries (2 uninjured)
Location
Tok, AK
Aircraft
Piper PA-18
Tail Number
N8597D
Operator
40 Mile Air
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC94LA129

AS THE AIRPLANE REACHED THE END OF THE 600-FT STRIP, THE PILOT APPLIED THE SECOND NOTCH OF FLAPS. THE AIRPLANE BECAME AIRBORNE FOR ABOUT 20 FT, AND THEN SETTLED INTO BRUSH. THE PASSENGER REPORTED THAT 'MY IMPRESSION IS THAT WE LACKED OR LOST ADEQUATE POWER TO MAINTAIN FLIGHT...' ANOTHER COMPANY PA-18 AT SITE HAD NO DIFFICULTY IN FERRYING EVERYONE FROM THE SITE. EXAMINATION OF THE ENGINE SHOWED THAT AN EXHAUST CAM LOBE WAS 30-40% WORN, AND THE ASSOCIATED CAM FOLLOWER WAS WORN AND DISH SHAPED. THE DEPTH OF THE WORN AREAS EXCEEDED THE DEPTH OF THE NITRATED SURFACE. ACCORDING TO THE DIR OF MAINT, A 50-HR INSPECTION WAS PERFORMED PREVIOUS TO THIS FLIGHT AND METAL PARTICLES WERE FOUND IN THE OIL SCREEN.

NTSB Probable Cause

THE WORN CAM SHAFT LOBE AND WORN VALVE LIFTER.

Full Narrative

On September 2, 1994, at 1126 Alaska daylight time, a wheel equipped Piper PA-18 airplane, N8597D, registered to the pilot, and operated by 40 Mile Air Ltd., of Tok, Alaska, crashed beyond the departure end of an airstrip during a takeoff attempt. The air taxi flight, operating under 14 CFR Part 135, was departing the accident site, which is located 24 nautical miles southwest of Tok on Natahona Creek, and the destination was Tok. A VFR flight plan was filed and visual meteorological conditions prevailed. The pilot and the passenger were not injured and the airplane was substantially damaged. According to the pilot, during an interview with FAA Inspector Steve Ketzer, he did not perform a engine run up because of the gravel and he did not check nor did he use carburetor heat prior to take off. The pilot stated that when he reached the end of the 600 foot long airstrip he applied a second notch of flaps and the airplane became airborne. The airplane then settled and the wheels struck some brush and the airplane crashed. The pilot could not recall the airspeed or the engine tachometer readings during the take off roll. Examination of the engine showed that one of the exhaust cam lodes on the camshaft was 30 to 40 percent worn and the cam follower was worn and dish shaped. According to Randy Rallo, Director of Maintenance for 40 Mile Air LTD., previous to this flight they performed a 50 hour inspection on the airplane and found metal particles in the oil screen. He further stated the wear on the cam lobe and cam follower went beyond the nitrated surface. Another PA-18, a company airplane, was also on the airstrip and had no difficulty in ferrying everyone from the accident site.

Flight

Event TypeAccident
Event Time11:26 AKDT
Nearest AirportNatahona Creek (0nm)
Runway27
Runway Length600 ft
Runway Width10 ft
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftPiper PA-18
Tail NumberN8597D
Aircraft CategoryAir
DamageSubstantial
Operator40 Mile Air
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A2B · Reciprocating · 150
Seats2

People & Injuries

Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 31 · Second Class

Conditions

ConditionsVMC
LightDaylight
WindCalm
Visibility3 sm
CeilingOvercast 4500 ft
Temperature / Dew Point34 C / 0 C
Altimeter0
Weather SourcePILO

Appendix: Source Data