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NTSB Report
November 26, 2010 · Burkhart Grob G-103A TWIN II ACRO · N855BG
Warner Springs, CA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
November 26, 2010
Injury Outcomes
No injuries (2 uninjured)
Location
Warner Springs, CA
Aircraft
Burkhart Grob G-103A TWIN II ACRO
Tail Number
N855BG
Operator
Sky Sailing
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR11CA060
The certified flight instructor (CFI) stated that he was providing instruction to a student pilot in a glider. After a routine local instructional flight, they returned to the departure airport for landing. The student was flying the glider and the CFI was providing verbal instructions to him as they completed a standard traffic pattern to the dirt landing area. He reported that there was a crosswind at 12 knots, gusting to about 20 knots. The glider encountered a high sink rate and the CFI took authority over the controls. The glider ground looped, resulting in substantial damage to the tail. The CFI reported no preimpact mechanical malfunctions or failures with the glider that would have precluded normal operation.
NTSB Probable Cause
The certified flight instructor's inadequate compensation for the crosswind and delayed remedial action during landing, which resulted in a ground loop.
Full Narrative
The certified flight instructor (CFI) was providing instruction to a student pilot in a glider. After a routine local instructional flight, they returned to the departure airport for landing. They flew a standard traffic pattern to runway 08R (dirt glider landing area) and the wind was from approximately 100 degrees at 12 knots, gusting to about 20 knots. The student was flying the glider, and the CFI was providing verbal instructions to him. The glider encountered a high sink rate, the CFI took the controls, and the glider ground looped. Post accident examination showed that the tail boom was fractured.
Flight
Event TypeAccident
Event Time12:55 PST
Nearest AirportWarner Springs Gliderport (0nm)
Runway08
Runway Length4700 ft
Runway Width70 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBurkhart Grob G-103A TWIN II ACRO
Tail NumberN855BG
Aircraft CategoryGli
DamageSubstantial
OperatorSky Sailing
Operating RulePart 91
Engines0
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 52 · Third Class · None
Crew 2Age 49 · None · None
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 8 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point64 F / 21 C
Altimeter30.12 inHg
Observation Time20:53