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NTSB accident investigation · Cessna T207 · Nanwalek, AK · August 23, 2016

Accident · No injuriesData collectionFinal report
Date
August 23, 2016, 09:46 local (17:46 UTC)
Place
Nanwalek, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N91025Cessna T207
Defining event
Landing-landing roll: Abnormal runway contact
Weather
Visual (VMC) · Day
Status
Completed · report January 18, 2017
Report
Approved by Office Director
NTSB office
General Aviation Accidents
FAA report
20160823015179A
Case key
93879

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot’s unstabilized approach and a subsequent runway overrun while landing on a short runway in variable wind conditions.

Findings · 5

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotCessna T207: 2 casesAll aircraft: 9,295 casesProbable cause
Aircraft capability: landing distanceAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna T207: 1 caseAll aircraft: 68 casesProbable cause
Wind: variable windEnvironmental issues › Conditions/weather/phenomena · Effect on equipmentCessna T207: 1 caseAll aircraft: 113 casesProbable cause
Object/animal/substance: poleEnvironmental issues › Physical environment · Contributed to outcomeCessna T207: 1 caseAll aircraft: 142 cases
Runway/land/takeoff/taxi surface: wet surfaceEnvironmental issues › Physical environment · Effect on operationCessna T207: 3 casesAll aircraft: 141 cases

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 pilot reported that during landing the wind sock at the airport indicated that the wind was variable, about 5 knots, and predominately favored runway 1. According to the FAA airport facility directory, runway 01/19 was 1,850 feet long, and soft gravel. However, 1,000 feet of northern portion of the runway was closed indefinitely. The pilot recalled that about 500 feet down the 1,850 foot runway, and just before touchdown the airplane encountered, "a pretty rapid shift in the winds in both direction and velocity." He reported that the airplane touched down momentarily, and then went airborne again. After the second touchdown, the speed did not decline as expected, and although the airplane did start to slow as it got a better grip on the gravel (which was wet from rain that had occurred earlier), he ran out of runway. He reported that the airplane overran the runway at a groundspeed of about 10 knots, went down a small embankment, had a propeller strike and the airplane sustained substantial damage when the left wing struck a post. The pilot reported that there were no mechanical malfunctions or anomalies during the flight that would have prevented normal flight operations. The pilot reported that he considered going around, but due to the wind and terrain rejected the idea.

Factual narrative

The pilot reported that during landing the wind sock at the airport indicated that the wind was variable, about 5 knots, and predominately favored runway 1. According to the FAA airport facility directory, runway 01/19 was 1,850 feet long, and soft gravel. However, 1,000 feet of northern portion of the runway was closed indefinitely. The pilot recalled that about 500 feet down the 1850 foot runway, and just before touchdown the airplane encountered, "a pretty rapid shift in the winds in both direction and velocity." He reported that the airplane touched down momentary, and then went airborne again. After the second touchdown, the speed did not decline as expected, and although the airplane did start to slow as it got a better grip on the gravel (which was wet from rain that had occurred earlier), he ran out of runway. He reported that the airplane overran the runway at a groundspeed of about 10 knots, went down a small embankment, had a propeller strike and the airplane sustained substantial damage when the left wing struck a post. The pilot reported that there were no mechanical malfunctions or anomalies during the flight that would have prevented normal flight operations. The pilot reported that he considered going around, but due to the wind and terrain rejected the idea.

Aircraft

Registration
N91025
Reported as
Cessna T207 (UNDESIGNAT)
Category
Airplane
Serial number
20700016
Built
1969
Airframe hours
4,536.7
Engine
Cont Motor IO-550-F12B, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Smokey Bay Air Inc
Registered owner
Smokey Bay Air Inc
Airworthiness certificate
Standard, Utility; Standard, Normal
Last inspection
100 hour · August 12, 2016
Departed
PGM · Port Graham, AK
Destination
KEB · Nanwalek, AK
Flight plan
Company VFR
Airport
KEB · Nanwalek, runway 01, 1,850 × 50 ft, gravel
Equipment
Stall warning system, Satellite tracking device

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
63
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
August 1, 2016
Seat
Left
Restraint
Lap only
Flight hours
18,100 total · 40 in this make and model · 12,000 as pilot in command · 40 in the last 90 days · 40 in the last 30 days · 4.4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
2,800 ft overcast
Temperature
54 °F, dew point 54 °F
Altimeter
29.89 inHg
Observed at
PASO, 9 nm away

Docket · 3

The files NTSB released with the investigation on December 6, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.7 MB 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 N91025 · 1

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