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NTSB Report
November 6, 2010 · Aviat Aircraft A-1B · N178WW
Heber City, UT
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
November 6, 2010
Injury Outcomes
No injuries (1 uninjured)
Location
Heber City, UT
Aircraft
Aviat Aircraft A-1B
Tail Number
N178WW
Operator
Stern Lessing S
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR11CA041
The pilot reported that he was practicing the procedures for making approaches to back-country remote airstrips and was flying in approach configuration about 40 to 60 feet over a mountain ridge. Although the wind was light and variable, just as the airplane was crossing the ridge it encountered a downdraft, which resulted in a sudden loss of altitude. Before the pilot was able to correct the descent, one of the airplane's main landing gear tires came in contact with the snow-covered terrain, which resulted in the airplane slowing down and flipping over onto its back. The accident sequence resulted in damage to the top of the rudder and to one of the wing lift struts. The pilot reported no mechanical failures or malfunctions with the airplane at the time of the accident.
NTSB Probable Cause
The pilot's failure to maintain clearance from the ground during low-level maneuvering in mountainous/hilly terrain.
Full Narrative
The pilot reported that he was practicing the procedures for making approaches to back-country airstrips, and was flying in approach configuration about 40 to 60 feet over a mountain ridge. Although the wind was light and variable, just as the flight was crossing the ridge, the airplane encountered a downdraft which resulted in it suddenly losing altitude. The pilot stated that before he was able to correct the situation, one of the airplane's main gear tires came in contact with the snow-covered terrain, which resulted in the airplane slowing down and flipping over onto its back. The accident sequence resulted in damage to the top of the rudder and to one of the wing lift struts. The pilot reported no mechanical failures or malfunctions with the airplane at the time of the accident.
Flight
Event TypeAccident
Event Time12:30 MDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAviat Aircraft A-1B
Tail NumberN178WW
Aircraft CategoryAir
DamageSubstantial
OperatorStern Lessing S
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360-A1D6 · Reciprocating · 200
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 49 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point61 F / 0 C
Altimeter0
Weather SourcePILO