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Aviation safety reports, made easier to study

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August 2, 2017 · Cessna 180 Undesignat · N9455C

Puntilla, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
August 2, 2017
Injury Outcomes
No injuries (1 uninjured)
Location
Puntilla, AK
Aircraft
Cessna 180 Undesignat (1955)
Tail Number
N9455C
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
GAA17CA473

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.

NTSB 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.

Full 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.

Flight

Event TypeAccident
Event Time19:00 AKDT
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireGrd
Aircraft ExplosionNo

Aircraft

AircraftCessna 180 Undesignat
Tail NumberN9455C
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsCont Motor · O-470J · Reciprocating · 225
Seats4

People & Injuries

Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 26 · Third Class · None

Conditions

ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO

Appendix: Source Data