Tuesday, August 06, 2019

Loss of Control on Ground: Schleicher ASW 27, N274JM; accident occurred July 27, 2019 in Mackay, Custer County, Idaho

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Boise, Idaho

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms 


Location: Mackay, ID
Accident Number: GAA19CA479
Date & Time: 07/27/2019, 1615 MDT
Registration: N274JM
Aircraft:Schleicher ASW 27
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal


The pilot reported that, while returning to the airport, the glider descended faster than expected, so he diverted to a field for landing. The glider encountered a wind gust, and the left wing hit the ground. The glider then ground looped to the left.

The glider sustained substantial damage to the fuselage, empennage, and right aileron.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the glider that would have precluded normal operation.

The pilot reported that the wind was from 140°, between about 10 and 20 knots, and gusting. The pilot landed the glider to the south.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's failure to maintain lateral control of the glider during landing in gusting wind conditions, which resulted in the left wing striking the ground and a subsequent ground loop. 


Lateral/bank control - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Gusts - Effect on operation (Cause)

Factual Information

History of Flight

Loss of lift

Landing-landing roll
Off-field or emergency landing
Collision with terr/obj (non-CFIT)
Loss of control on ground (Defining event)
Other weather encounter

Pilot Information

Certificate: Flight Instructor; Commercial
Age: 74, Male
Airplane Rating(s): None
Seat Occupied: Single
Other Aircraft Rating(s): Glider
Restraint Used:
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): Glider
Toxicology Performed: No
Medical Certification: None
Last FAA Medical Exam:
Occupational Pilot: No
Last Flight Review or Equivalent: 10/18/2018
Flight Time:  (Estimated) 3164 hours (Total, all aircraft), 1130 hours (Total, this make and model), 3164 hours (Pilot In Command, all aircraft), 82 hours (Last 90 days, all aircraft), 42 hours (Last 30 days, all aircraft), 4 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Schleicher
Registration: N274JM
Model/Series: ASW 27 Undesignated
Aircraft Category: Glider
Year of Manufacture: 1986
Amateur Built: No
Airworthiness Certificate: Experimental
Serial Number: 27029
Landing Gear Type: Retractable - Tailwheel
Seats: 1
Date/Type of Last Inspection: 10/19/2018, Condition
Certified Max Gross Wt.: 1102 lbs
Time Since Last Inspection:
Engines: 0
Airframe Total Time: 1408 Hours at time of accident
Engine Manufacturer:
ELT: Not installed
Engine Model/Series:
Registered Owner: On file
Rated Power:
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KSUN, 5306 ft msl
Distance from Accident Site: 40 Nautical Miles
Observation Time: 2347 UTC
Direction from Accident Site: 238°
Lowest Cloud Condition: Few / 12000 ft agl
Visibility:  10 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: 8 knots / 14 knots
Turbulence Type Forecast/Actual: None / Terrain-Induced
Wind Direction: 260°
Turbulence Severity Forecast/Actual: N/A / Moderate
Altimeter Setting: 30.18 inches Hg
Temperature/Dew Point: 29°C / 7°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Mackay, ID (U62)
Type of Flight Plan Filed: None
Destination: Mackay, ID (U62)
Type of Clearance: None
Departure Time: 1315 MDT
Type of Airspace: Class G

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 43.853333, -113.512778 (est)

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