ANC00LA119

NTSB accident investigation · Piper PA-18 · Sleetmute, AK · September 11, 2000

Accident · Serious injuriesLimited investigationFinal report
Date
September 11, 2000, 11:00 local (19:00 UTC)
Place
Sleetmute, AK
Injuries
1 serious, 1 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N9692PPiper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report May 18, 2001
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20000911042669A
Case key
50991

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 loss of aircraft control precipitated by the pilot's inadvertent stall. Factors associated with the accident are the disengagement of the stabilizer trim system, which resulted in reduced aircraft control, an inadvertent stall by the pilot, and a large set of moose antlers attached to the left float, which disrupted the airflow over the stabilizer.

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 - in flightTakeoff - initial climb
Flt control syst,stabilator trim - disengagedFactor
External load equipment - improper use ofPilot in commandFactor
Aircraft control - reducedFactor
Stall - inadvertentPilot in commandCause
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - water

Analysis

The pilot said that immediately after takeoff, he had difficulty lowering the float-equipped airplane's nose. The airplane stalled and impacted the water. The pilot said he thought the elevator trim did not function. He also stated that there was a large moose rack tied to the left float. Postaccident inspection by two FAA inspectors revealed the stabilizer rear trim mechanism was in the neutral position and rotated freely. The rear stabilizer hinge was free to rotate. The stabilizer trim actuator handle in the cockpit was missing, and the actuator would only partially engage. The inspectors could not determine if the damage was preaccident or postaccident.

Factual narrative

On September 11, 2000, about 1100 Alaska daylight time, a float equipped Piper PA-18 airplane, N9692P, sustained substantial damage during takeoff from a lake about 16 miles southeast of Sleetmute, Alaska, at 61 degrees, 26 minutes north latitude, 156 degrees, 59 minutes west longitude. The commercial pilot was not injured. The single passenger received serious injuries. The flight was conducted under 14 CFR Part 91, by Anderson Wilderness Guide Service, Inc., of McComb, Michigan, as a hunter guide flight. The flight was departing for Sleetmute. 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 22, and in his NTSB pilot/operator report, that immediately after takeoff he had difficulty lowering the airplane's nose. He said that while attempting to return to the lake, the airplane stalled and impacted the water. The airplane sustained substantial damage to both wings and the fuselage. The pilot said he thought the elevator trim did not function. He also stated that there was a large moose rack tied to the left float.

Postaccident inspection of the airplane on October 17 by two FAA inspectors, after it had been recovered to Wolf Lake Airport, Alaska, revealed the stabilizer rear trim mechanism was in the neutral position and rotated freely. The rear stabilizer hinge was free to rotate. The stabilizer trim actuator handle in the cockpit was missing, and the actuator would only partially engage. The inspectors could not determine if the damage was preaccident or postaccident.

Aircraft

Registration
N9692P
Reported as
Piper PA-18
Category
Airplane
Serial number
18-7509036
Airframe hours
2,500
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Operator
Anderson Wilderness Guide Svc
Registered owner
Anton Anderson
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 1, 2000 · 80 hours before
Destination
SLQ · 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
55
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
1,500 total · 1,000 in this make and model · 1,400 as pilot in command · 100 in the last 90 days · 80 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
39 °F

FAA reports on this event · 1

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

Other investigations on N9692P · 2

Matched to the same aircraft by N-number and date.