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NTSB Report
October 13, 2010 · Conrad Theodore J Thorp T-18 · N86TJ
Fredericksburg, TX
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
October 13, 2010
Injury Outcomes
No injuries (1 uninjured)
Location
Fredericksburg, TX
Aircraft
Conrad Theodore J Thorp T-18
Tail Number
N86TJ
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN11CA030
According to the pilot, he reduced engine power to slow the airplane for landing while on the downwind leg of the traffic pattern. He then attempted to increase power and the engine did not respond. The pilot maneuvered the airplane immediately toward the runway and it floated during the landing. When the airplane touched down, there was insufficient distance remaining to stop on the runway. The airplane departed the end of the runway and the pilot intentionally ground-looped the airplane to stay on the airport property, causing substantial damage to both wings. A postaccident examination of the engine revealed that the clamp securing the throttle controller end was allowing the cable to slip freely.
NTSB Probable Cause
The malfunction of the throttle clamp, which resulted in the pilot's inability to control the engine's power setting.
Full Narrative
While flying the downwind leg for a full-stop landing, the pilot reduced engine power to slow the airplane for landing. When the pilot advanced the throttle, the engine did not respond. The pilot turned the airplane immediately for the runway. Due to the "tighter" pattern and increased airspeed, the airplane floated during the landing. When the airplane touched down on the runway, there was insufficient distance remaining for the airplane to stop on the runway. The airplane departed the end of the runway and the pilot ground looped the airplane to stay on the airport property. Substantial damage was sustained to both wings. An examination of the engine revealed that the clamp securing the throttle controller end was allowing the cable to slip freely.
Flight
Event TypeAccident
Event Time10:00 CDT
Nearest AirportGillespie County (1nm)
Runway32
Runway Length5001 ft
Runway Width75 ft
Flight Plan FiledUnknown
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftConrad Theodore J Thorp T-18
Tail NumberN86TJ
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 SERIES · Reciprocating · 180
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 72 · Third Class · None
Conditions
ConditionsVMC
LightDaylight
Wind30° @ 8 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F / 52
Altimeter30.31 inHg
Observation Time15:05
Weather SourceWFAC