GAA17CA473

NTSB accident investigation · Cessna 180 · Puntilla, AK · August 2, 2017

Accident · No injuriesData collectionFinal report
Date
August 1, 2017, 19:00 local (Aug 2, 2017, 03:00 UTC)
Place
Puntilla, AK
Injuries
1 uninjured
Damage
Destroyed
Phase of flight
Landing
Aircraft
N9455CCessna 180
Defining event
Landing: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report March 14, 2018
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20170801015669A
Case key
95763

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 airplane’s encounter with a downdraft while maneuvering at a low altitude, which resulted in the exceedance of the airplane’s critical angle of attack and a subsequent aerodynamic stall.

Findings · 3

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.

Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Capability exceededCessna 180: 3 casesAll aircraft: 990 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotCessna 180: 65 casesAll aircraft: 9,295 casesProbable cause
Wind: downdraftEnvironmental issues › Conditions/weather/phenomena · Effect on operationCessna 180: 2 casesAll aircraft: 178 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

According to the pilot, he made two passes over a dry creek bed to assess a potential landing site. The second pass was accomplished up-creek into rising terrain. The airplane was configured with full power and with flaps at 20°, and it was about 50 ft above ground level at 80 mph. The pilot reported that the airplane encountered a downdraft as it transitioned from overflying the trees to overflying the creek bed, which he attempted to correct, but the airplane aerodynamically stalled. Following the stall, the pilot attempted to land on a dry creek bed. The airplane touched down on the creek bed, then bounced and descended into a "dry cut channel." The airplane came to rest nose down in a near vertical position. The airplane was destroyed by a postcrash fire. According to the National Transportation Safety Board's Pilot Aircraft Accident Report, the pilot reported that the event could have been avoided by making the low pass along descending terrain at a higher airspeed. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Factual narrative

According to the pilot, he made two passes over a dry creek bed to assess a potential landing site. The second pass was accomplished up creek into rising terrain. The airplane was configured with full power, with flaps at 20° and flying about 50ft AGL and 80 MPH. The pilot reported that the airplane encountered a downdraft as the airplane transitioned from overflying the trees, to overflying the creek bed, which he attempted to correct, but the airplane aerodynamically stalled. Following the stall, the pilot attempted to land on a dry creek bed. The airplane touched down on the creek bed, then bounced and descended into a "dry cut channel". The airplane came to rest nose down and the airplane in a near vertical position. The airplane was destroyed by a post-crash fire. According to the National Transportation Safety Board's, Pilot Aircraft Accident Report, the pilot reported that the event could have been avoided by making the low pass along descending terrain at a higher airspeed. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N9455C
Reported as
Cessna 180 (UNDESIGNAT)
Category
Airplane
Serial number
31853
Built
1955
Airframe hours
2,883
Engine
Cont Motor O-470J, 225 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 3, 2016
Departed
PAWS · Wasilla, AK
Equipment
Stall warning system

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
26
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Without waivers/limitations
Last flight review
June 3, 2017
Seat
Left
Restraint
Lap only
Flight hours
305 total · 70 in this make and model · 277 as pilot in command · 55 in the last 90 days · 30 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Observed at
KPTI, 13 nm away

Docket · 2

The files NTSB released with the investigation on January 30, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.7 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.