ANC10LA083

NTSB accident investigation · Cessna 207A · Tuluksak, AK · September 4, 2010

Accident · Serious injuriesLimited investigationFinal report
Date
September 3, 2010, 18:30 local (Sep 4, 2010, 02:30 UTC)
Place
Tuluksak, AK
Injuries
1 serious, 2 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N9942MCessna 207A
Defining event
Takeoff: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed · report May 11, 2011
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA FSDO-03
FAA report
20100903047499A
Case key
77235

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 delayed application of full power during a soft/wet field takeoff, resulting in a collision with trees during takeoff.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Aircraft capability: climb capabilityAircraft › Aircraft oper/perf/capability · Capability exceededCessna 207A: 1 caseAll aircraft: 183 casesProbable cause
Runway/land/takeoff/taxi surface: soft surfaceEnvironmental issues › Physical environment · Contributed to outcomeCessna 207A: 2 casesAll aircraft: 264 cases
Runway/land/takeoff/taxi surface: wet surfaceEnvironmental issues › Physical environment · Contributed to outcomeCessna 207A: 2 casesAll aircraft: 141 cases
Personnel issuesPersonnel issues › Task performance · PilotCessna 207A: 1 caseAll aircraft: 137 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The director of operations for the operator stated that soft field conditions and standing water on the runway slowed the airplane during the takeoff roll. The airplane did not lift off in time to clear trees at the end of the runway and sustained substantial damage to both wings and the fuselage when it collided with the trees. The pilot reported that he used partial power at the beginning of the takeoff roll to avoid hitting standing water on the runway with full power. After passing most of the water, he applied full power, but the airplane did not accelerate like he thought it would. He recalled the airplane being in a nose-high attitude and the main wheels bouncing several times before the airplane impacted the trees at the end of the runway.

Factual narrative

On September 3, 2010, about 1830 Alaska daylight time, a Cessna 207A airplane sustained substantial damage during a collision with trees while taking off at the Tuluksak Airport, Tuluksak, Alaska. The airplane was operated by Grant Aviation Inc., Anchorage, Alaska, as a visual flight rules on-demand passenger flight under Title 14, Code of Federal Regulations Part 135, when the accident occurred. The airline transport pilot received serious injuries, and the two passengers received minor injuries. Visual meteorological conditions prevailed, and company flight following procedures were in effect. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on September 4, the director of operations for the operator said it appeared that soft field conditions and standing water on the runway prevented the airplane from accelerating fast enough to lift off in time to clear trees at the end of the runway. He said the airplane came to rest off the end of the runway in the trees, and sustained substantial damage to both wings and the fuselage. In a written statement to the NTSB dated September 10, the pilot wrote that he did not apply full power at the beginning of the takeoff roll in order to avoid hitting standing water on the runway at full power. He said he applied full power after passing the puddles, but the airplane did not accelerate as he thought it would. He said he recalled the nose of the airplane being in a nose-high attitude, and the main wheels bouncing several times before the airplane impacted trees at the end of the runway.

Aircraft

Registration
N9942M
Reported as
Cessna 207A
Category
Airplane
Serial number
20700756
Airframe hours
29,550
Engine
Cont Motor IO-520-F, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Grant Aviation Inc, doing business as Grant Aviation
Registered owner
Alaska Aircraft Leasing LLC
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · August 10, 2010
Departed
TLT · Tuluksak, AK
Flight plan
Company VFR
Airport
TLT · Tuluksak, runway 20, 2,461 × 30 ft, gravel

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
Certificates
Airline transport, Flight instructor
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
April 26, 2010
Seat
Left
Flight hours
4,545 total · 245 in this make and model · 4,365 as pilot in command · 188 in the last 90 days · 83 in the last 30 days · 7 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
94° at 8 knots
Visibility
8 statute miles
Lowest ceiling
1,700 ft broken
Temperature
52 °F, dew point 50 °F
Altimeter
29.57 inHg
Observed at
PABE, 31 nm away

Docket · 1

The files NTSB released with the investigation on February 22, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 464 KB in all.

FAA reports on this event · 1

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