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NTSB Report
June 14, 2006 · Grumman-Schweizer G-164A · N9709
Cokeville, WY
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
June 14, 2006
Injury Outcomes
1 injury (1 minor injury)
Location
Cokeville, WY
Aircraft
Grumman-Schweizer G-164A
Tail Number
N9709
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
DEN06CA088
According to the pilot, he was returning to the airport due to an approaching thunderstorm. During the landing roll the airplane encountered a gust of wind and ground looped. Both wings separated, the propeller was bent, and the horizontal stabilizer was crushed and wrinkled. The pilot reported no anomalies with the airframe or airplane systems. The routine aviation weather report reported, winds, 230 degrees at 25 knots, gusting 31 knots. The pilot estimated the gust of wind at 40 knots.
NTSB Probable Cause
the pilot's failure to maintain directional control resulting in a ground loop. Contributing factors included the high winds and crosswind.
Full Narrative
According to the pilot, he was returning to the airport due to an approaching thunderstorm. The pilot entered traffic for runway 15, and while on final, noticed that the wind had shifted to favor runway 33. During the landing roll to runway 33 (3,400 feet by 60 feet, asphalt), the airplane encountered a gust of wind and the airplane ground looped. Both wings separated, the propeller was bent, and the horizontal stabilizer was crushed and wrinkled. The pilot reported no anomalies with the airframe or airplane systems. The closest official weather observation station was Uninta County Airport/Burns Field (EVW), Evanston, Wyoming, located 45 nautical miles south of the accident site. The routine aviation weather report (METAR) for EVW, issued at 1053, reported, winds, 230 degrees at 25 knots, gusting 31 knots. The pilot estimated the gust of wind at 40 knots.
Flight
Event TypeAccident
Event Time10:30 MDT
Nearest AirportCokeville Municipal Airport (1nm)
Runway33
Runway Length3400 ft
Runway Width60 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman-Schweizer G-164A
Tail NumberN9709
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsHoneywell · TPE 331-2-201 · Reciprocating · 600
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 50 · Second Class · Minor
Conditions
ConditionsVMC
LightDaylight
Wind230° @ 25 kt, gusting 31 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point61 F / 32 C
Altimeter30.01 inHg
Observation Time16:53
Weather SourceWFAC