ANC05LA085

NTSB accident investigation · Cessna U206F · Skwentna, AK · June 13, 2005

Accident · Serious injuriesLimited investigationFinal report
Date
June 12, 2005, 17:30 local (Jun 13, 2005, 01:30 UTC)
Place
Skwentna, AK
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N51205Cessna U206F
Weather
Visual (VMC) · Day
Status
Completed · report January 31, 2006
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA-ANC FSDO 03
FAA report
20050612015089A
Case key
61681

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 improper loading of externally carried lumber that caught fire due to exposure to hot exhaust gases during cruise flight, which resulted in an emergency descent/landing and subsequent collision with a gravel bar. A factor contributing to the accident was the operator's lack of FAA approval for the external lumber rack that was installed under the belly of the airplane.

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.

FireCruise
Miscellaneous,airframe - fireCause
Loading of cargo - improperPilot in commandCause
Towing/advertising/external load equipment - unapprovedFactor
In flight collision with terrain/waterEmergency descent/landing
Terrain condition - sand bar

Analysis

The commercial certificated pilot was on a 14 CFR Part 135 air taxi cargo flight transporting a load of plywood in an external rack that was attached to the belly of the fixed tricycle gear-equipped airplane. During cruise flight at 1,500 feet msl, he noticed the smell of smoke in the cockpit. He flew towards a river as flames entered the cabin of the airplane, and made an emergency landing on a gravel bar. He jumped from the airplane during the landing roll, and the airplane continued to roll until it struck a log and nosed over, with the fire still burning. Passing aircraft saw smoke in the area, and then spotted the airplane and the pilot in the river outside of the airplane. A helicopter pilot was nearby and responded to the scene. The pilot was airlifted to a local hospital by the helicopter pilot. According to the FAA, no records were found that the operator had an external load authorization. No records were found indicating that the airplane had a restricted category authorization for external loads, nor any authorization for installation of the external lumber rack.

Factual narrative

On June 12, 2005, about 1730 Alaska daylight time, a fixed tricycle gear-equipped Cessna U206F airplane, N51205, sustained substantial damage during an in-flight and postcrash fire, after an emergency landing on a remote gravel bar, about 11 miles, south-southwest of Skwentna, Alaska. The airplane was being operated as a visual flight rules (VFR) on-demand cargo flight under Title 14, CFR Part 135, when the accident occurred. The airplane was operated by the pilot, doing business as Alaska Airborne Adventures, Wasilla, Alaska. The commercial certificated pilot, the sole occupant, received serious injuries. Visual meteorological conditions prevailed. The flight departed the Willow Airport, Willow, Alaska, about 1715, en route to the Hayes River, Alaska, and no flight plan was filed, nor was one required.

The Federal Aviation Administration's (FAA) Alaska Regional Operations Center received notification from a remote lodge operator that the accident airplane was burning on a gravel bar in the Skwentna River. Passing aircraft initially saw smoke in the area, and then spotted the airplane and a single occupant in the river outside of the airplane. The operator of a helicopter who was flying in the area, overheard radio conversations about the accident and responded to the scene. The pilot was airlifted to a local hospital by the helicopter pilot.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on June 13, the lodge owner and the helicopter pilot reported that the airplane was carrying an external load of plywood under the belly of the airplane. During cruise flight, the plywood caught fire, and the pilot made an emergency landing on a gravel bar.

In the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) submitted by the pilot, he reported that he was transporting 500 pounds of lumber inside the airplane. He was transporting 200 pounds of 4 feet, by 8 feet, 1/2 inch-thick plywood in a external lumber rack, attached to the belly of the airplane. During cruise flight at 1,500 feet msl, the pilot indicated he noticed the smell of smoke in the cockpit. He flew toward the Skwentna River as flames entered the cabin of the airplane, and made an emergency landing on a gravel bar. He jumped out of the airplane during the landing roll, and the airplane continued to roll until it hit a log and nosed over, with the fire still burning.

According to FAA personnel from the Flight Standards District Office (FSDO), Anchorage, Alaska, the FAA had no records that the operator had any external load authorization. No records were found indicating that the airplane had a restricted category authorization for external loads, nor any authorization for installation of the external lumber rack.

Aircraft

Registration
N51205
Reported as
Cessna U206F
Category
Airplane
Serial number
U20601979
Airframe hours
13,785
Engine
Continental IO-520-F, 300 horsepower, reciprocating
Damage
Substantial damage
Fire
In-Flight
Flight
Part 135
Operator
Mark W. Bills, doing business as Alaska Airborne Adventures
Registered owner
Mark W. Bills II
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 1, 2004 · 95 hours before
Departed
PAUO · Willow, AK
Destination
Skwentna, 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
34
Injuries
Serious
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
August 1, 2004
Seat
Left
Flight hours
8,250 total · 2,850 in this make and model · 8,200 as pilot in command · 40 in the last 90 days · 15 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 5 knots
Visibility
50 statute miles
Lowest ceiling
None
Temperature
64 °F, dew point 54 °F
Altimeter
29.29 inHg

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 N51205 · 2

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