ANC95LA125

NTSB accident investigation · Cessna 207 · Shishmaref, AK · July 23, 1995

Accident · No injuriesLimited investigationFinal report
Date
July 23, 1995, 12:00 local (20:00 UTC)
Place
Shishmaref, AK
Injuries
6 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N75738Cessna 207
Weather
Visual (VMC) · Day
Status
Completed · report February 14, 1996
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19950723026359A
Case key
2704

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 failure to adequately compensate for the downdraft. Factors associated with the accident were: the short, uphill runway, and downdrafts.

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.

In flight collision with terrain/waterTakeoff - initial climb
Airport facilities,runway/landing area condition - uphillFactor
Airport facilities,runway/landing area condition - short runway/landing areaFactor
Terrain condition - high vegetation
Weather condition - downdraftFactor
Compensation for wind conditions - inadequatePilot in commandCause
Stall/mush - inadvertentPilot in command

Analysis

The pilot was taking off from a short, uphill runway towards rising terrain. Tall brush bordered the end of the departure runway. The pilot reported the airplane became airborne about 3/4 of the way down the runway, but soon encountered downdrafts and was unable to climb. He said the stall warning horn went off, the airplane shuddered, and then descended into tall brush. An aviation mechanic who went to the scene said the airplane's first encounter with the brush was approximately 50 feet beyond the departure end of the runway, and the airplane's main landing gear made tracks in the dirt of the airstrip until approximately 150 feet from that initial impact point (approximately 100 feet from departure end of runway).

Factual narrative

On July 23, 1995, about 1200 Alaska daylight time, a wheel equipped Cessna 207 airplane, N75738, sustained substantial damage when it collided with brush and terrain during an attempted takeoff from an improved, but not maintained, rural airstrip at Serpentine Hot Springs. Serpentine Hot Springs is located approximately 45 miles southeast of Shishmaref, Alaska. The airline transport certificated pilot and five passengers aboard were not injured. The 14 CFR Part 91 flight operated in visual meteorological conditions without a flight plan.

The pilot reported he was attempting to takeoff into a 15 to 18 knot northeasterly wind. The wind favored runway 09, which slopes uphill approximately 3 percent. The pilot estimated the runway length as 1,300 feet long and 50 feet wide. In his written statement to the NTSB, the pilot states that the airplane lifted off after 3/4 of the runway had been used, accelerated in ground effect, and then began to climb. He said the airplane crossed the brush line at the end of the runway, and the airplane, "...encountered mechanically induced wind shear and downdrafts." He said that the stall warning horn went off, the airplane shuddered, and began to sink towards the brush. The airplane settled into the brush about 500 feet beyond the end of the runway.

An airframe and powerplant aviation mechanic who went to the site and inspected the wreckage, said, in part: "The runway is about 1,200 feet long...the site the airplane was recovered from was approximately 200 feet from the end of the runway. The aircraft had contacted the ground four times between the end of the runway and where it finally stopped. The first time was in four foot high willows about 50 feet from the end of the runway. Tracks from the aircraft right and left main gear could be seen in the dirt at the northeast end of the runway about 150 feet from the first point of contact in the willows."

A witness on the ground who saw the takeoff, said, in a portion of her written statement: "The airplane used the length of the runway and was airborne when its landing gear began to brush the willows beyond the runway."

Aircraft

Registration
N75738
Reported as
Cessna 207
Category
Airplane
Serial number
T20700641
Airframe hours
8,888
Engine
Continental IO-520-F3B, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Bering Air
Registered owner
Gustavus Dray
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · June 20, 1995 · 26 hours before
Destination
OME · Nome, AK
Airport
NONE · Serpentine Hot Springs, runway 9, 1,200 × 50 ft, dirt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
30
Certificates
Flight instructor, Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
7,250 total · 600 in this make and model · 7,050 as pilot in command · 300 in the last 90 days · 100 in the last 30 days · 14 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
60° at 15 knots, gusting 18
Visibility
20 statute miles
Lowest ceiling
2,500 ft broken
Temperature
48 °F

FAA reports on this event · 1

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