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NTSB Report
December 21, 1991 · Artic Aircraft S-1B2 · N71AT
Lysite, WY
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 21, 1991
Injury Outcomes
1 injury (1 minor injury), 1 uninjured
Location
Lysite, WY
Aircraft
Artic Aircraft S-1B2
Tail Number
N71AT
Operator
Sky Aviation
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
SEA92LA030
THE PILOT REPORTED THAT WHILE ON AN AERIAL SURVEY OF GAME THE AIRCRAFT ENCOUNTERED A HEADWIND BUT LITTLE TURBULENCE. UPON APPROACHING A RIDGE HE EXECUTED A RIGHT TURN TO REVERSE COURSE DURING WHICH A SEVERE DOWNDRAFT WAS ENCOUNTERED. THE PILOT REPORTED APPLYING FULL POWER AND ATTEMPTING TO ESTABLISH BEST ANGLE OF CLIMB DURING WHICH THE AIRCRAFT IMPACTED THE TERRAIN. THE PILOT REPORTED THE WINDS AT THE ACCIDENT SITE AS 20 KNOTS WITH GUSTS TO 25 KNOTS.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN CLEARANCE WITH TERRAIN. FACTORS CONTRIBUTING TO THE ACCIDENT WERE RISING TERRAIN, DOWNDRAFTS, AND THE PILOT'S INADEQUATE COMPENSATION FOR WIND CONDITIONS.
Full Narrative
THE PILOT REPORTED THAT WHILE ON AN AERIAL SURVEY OF GAME THE AIRCRAFT ENCOUNTERED A HEADWIND BUT LITTLE TURBULENCE. UPON APPROACHING A RIDGE HE EXECUTED A RIGHT TURN TO REVERSE COURSE DURING WHICH A SEVERE DOWNDRAFT WAS ENCOUNTERED. THE PILOT REPORTED APPLYING FULL POWER AND ATTEMPTING TO ESTABLISH BEST ANGLE OF CLIMB DURING WHICH THE AIRCRAFT IMPACTED THE TERRAIN. THE PILOT REPORTED THE WINDS AT THE ACCIDENT SITE AS 20 KNOTS WITH GUSTS TO 25 KNOTS.
Flight
Event TypeAccident
Event Time08:30 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftArtic Aircraft S-1B2
Tail NumberN71AT
Aircraft CategoryAir
DamageSubstantial
OperatorSky Aviation
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-B2B · Reciprocating · 160
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury), 1 uninjured
Fatal0
Serious0
Minor1
Uninjured1
Total2
Crew 1Age 42 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility60 sm
CeilingNone
Temperature / Dew Point7 C / 1 C
Altimeter30.00 inHg
Observation Time15:48
Weather SourceWFAC