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NTSB Report
October 14, 2011 · Hughes 269A · N10375
Fort Worth, TX
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
October 14, 2011
Injury Outcomes
No injuries (2 uninjured)
Location
Fort Worth, TX
Aircraft
Hughes 269A
Tail Number
N10375
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN12CA031
The certified flight instructor (CFI) and pilot receiving instruction were practicing hovering autorotations on a taxiway. With the skids on the ground for about 20 seconds after completing a hovering autorotation and with the engine at 2,000 rpm, the helicopter began to vibrate and violently shake, consistent with ground resonance. The vibrations and shaking continued to increase and lasted about 15 to 30 seconds. After the shaking stopped, the CFI shut down the helicopter. A postaccident examination of the helicopter revealed that the tail rotor and gearbox separated, and the fuselage was bent and deformed. No preimpact mechanical malfunctions or failures with the helicopter were noted that would have precluded normal operation.
NTSB Probable Cause
Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Prop/rotor parameters-Not attained/maintained
Full Narrative
After practicing some flight and landing maneuvers, the certified flight instructor and pilot receiving instruction decided to practice some hovering autorotations on a taxiway. With the skids on the ground for approximately 20 seconds after completing a hovering autorotation and the engine at 2,000 RPM, the helicopter began to vibrate and violently shake. The vibrations and shaking continued to increase and lasted approximately 15 to 30 seconds. After the shaking stopped, the certified flight instructor shutdown the helicopter. Postaccident examination of the helicopter revealed the tail rotor and gearbox separated, and the fuselage was bent and deformed. No preimpact mechanical malfunctions or failures with the helicopter were noted that would have precluded normal operation.
Flight
Event TypeAccident
Event Time09:20 CDT
Nearest AirportFort Worth Mecham Intl. Airpor (0nm)
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 269A
Tail NumberN10375
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · HIO-360-B1A · Reciprocating · 180
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 40 · Second Class · None
Crew 2Age 40 · Third Class · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point54 / 50
Altimeter29.97 inHg
Weather SourcePILO