ANC02LA016

NTSB accident investigation · Cessna 208B · Tununak, AK · February 24, 2002

Accident · No injuriesLimited investigationFinal report
Date
February 24, 2002, 18:30 local (22:30 UTC)
Place
Tununak, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N454SFCessna 208B
Weather
Visual (VMC) · Day
Status
Completed · report June 4, 2002
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Fairbanks FSDO
FAA report
20020224015219A
Case key
54285

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 selection of unsuitable terrain for landing. Factors associated with the accident are snow drifts across the runway, and excessive braking during the rearward roll.

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.

On ground/water encounter with terrain/waterTaxi - from landing
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Terrain condition - snow coveredFactor
Brakes(normal) - excessivePilot in commandFactor

Analysis

During the landing roll, the pilot braked to a stop with the nose wheel atop a snow drift. The pilot released the brakes and the airplane rolled backward. When the pilot reapplied the brakes the aircraft rocked rearward, pivoting on the main landing gear, and the tail struck the ground, damaging two fuselage bulkheads.

Factual narrative

On February 24, 2002, about 1830 Alaska standard time, a wheel-equipped Cessna 208B airplane, N454SF, sustained substantial damage during taxi, after landing at the Tununak Airport, Tununak, Alaska. The airplane was being operated as a visual flight rules (VFR) cargo flight under Title 14, CFR Part 135, when the accident occurred. The airplane was operated by Grant Aviation, Inc. of Anchorage, Alaska. The solo certificated airline transport pilot was not injured. The flight originated at the Bethel Airport, Bethel, Alaska, about 1750.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on February 25, the director of operations for the operator reported that while en route to the Tununak airport the pilot had received a pilot report, stating that only half of the length of the 2,010 foot runway was plowed. When the pilot braked to a stop on the runway, the nose wheel of the airplane stopped on a snowdrift crossing the runway. When he released the brakes, the airplane started to roll backward off the snowdrift. When he reapplied the brakes to stop the roll, the airplane rocked rearward, pivoting on the main landing gear, and the tail struck the snow-covered ground. The pilot inspected the airplane and found that the tail tie down ring and the aft fuselage bulkhead were damaged.

During a telephone conversation with the IIC on March 4, the director of maintenance reported that the two furthest-aft fuselage bulkheads (Station 474.4 and 475.88), and the tail tie down ring and doublers, were replaced due to the damage received in the accident. He said the airplane had no known mechanical problems or damage prior to the accident.

Aircraft

Registration
N454SF
Reported as
Cessna 208B
Category
Airplane
Serial number
208B0797
Airframe hours
2,499.5
Engine
P&W Canada PT6A-114A, 675 horsepower, turbo prop
Damage
Substantial damage
Flight
Part 135
Registered owner
Grant Aviation, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · January 3, 2002 · 95.8 hours before
Departed
PABE · Bethel, AK
Destination
4KA · Tununak, AK
Flight plan
Company VFR
Airport
4KA · Tununak, runway 08, 2,010 × 40 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
30
Injuries
None
Certificates
Flight instructor, Commercial
Airplane ratings
Single-engine land, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Last flight review
February 24, 2002
Seat
Left
Flight hours
4,136 total · 1,537 in this make and model · 4,070 as pilot in command · 103 in the last 90 days · 69 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
130° at 10 knots
Visibility
10 statute miles
Lowest ceiling
3,000 ft overcast

Docket · 1

The files NTSB released with the investigation on May 15, 2002, on NTSB’s docket system: statements, records, photos and specialists’ reports. 426 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.

Other investigations on N454SF · 3

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