ANC95LA037

NTSB accident investigation · Piper J3 · Skwentna, AK · March 10, 1995

Accident · No injuriesLimited investigationFinal report
Date
March 10, 1995, 17:00 local (21:00 UTC)
Place
Skwentna, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N88415Piper J3
Weather
Visual (VMC) · Day
Status
Completed · report September 24, 1995
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19950310008189A
Case key
2634

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

A frozen engine breather tube which resulted in a loss of oil and engine power.

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 engine power(partial) - nonmechanicalCruise
Lubricating system,oil tubing - obstructedCause
Lubricating system,oil tubing - frozen
Fluid,oil - exhaustion
Forced landingDescent - emergency
On ground/water collision with objectLanding - roll
Object - tree(s)

Analysis

During a cross-country ferry flight, the airplane's windshield began to get spattered with oil and the engine oil pressure began to decrease. The pilot selected a forced landing area on a remote frozen lake. During the landing roll, the airplane's right wing struck a tree, producing damage to the wing and fuselage. The pilot indicated that the engine breather tube was frozen over. Due the remote nature of the area, the pilot replaced the engine oil and departed the lake. The airplane was flown to the next available airstrip and secured. Damage to the airplane was reported to the NTSB 12 days later.

Factual narrative

On March 10, 1995, about 1700 Alaska standard time, a ski equipped Piper J3, N88415, collided with a tree during a forced landing, about 65 miles northwest of Skwentna, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country ferry flight to deliver the airplane to Aniak, Alaska, via McGrath, Alaska, when the accident occurred. The airplane sustained substantial damage. The certificated commercial pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed. After refueling the airplane, the flight originated at Big Lake Airport, Big Lake, Alaska, about 1300 after an initial departure from Birchwood, Alaska.

The pilot reported that while in cruise flight after transiting through Rainy Pass, the windshield began to get spattered with oil. The engine began losing oil pressure and the pilot selected a forced landing area on a remote frozen lake. During the landing roll, the airplane's right wing struck a tree, resulting in damage to the right wing spar and rear fuselage longeron. The pilot indicated that he found the engine breather tube frozen. Due to the remote nature of the area, the pilot replaced the engine oil and departed. The airplane was flown to Farewell Lake, Alaska, and secured. The damage to the airplane was reported on March 22, 1995.

Aircraft

Registration
N88415
Reported as
Piper J3
Category
Airplane
Serial number
16139
Airframe hours
9,598
Engine
Continental C-85, 85 horsepower, reciprocating
Damage
Substantial damage
Flight
Ferry · Part 91
Operator
Dean Heimermann
Registered owner
Joe Fanazock
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 22, 1995 · 15 hours before
Departed
BGQ · Big Lake, AK
Destination
MCG · Mcgrath, AK

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
23
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
2,100 total · 15 in this make and model · 1,900 as pilot in command · 300 in the last 90 days · 100 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
50 statute miles
Lowest ceiling
None
Temperature
19 °F

FAA reports on this event · 1

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