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NTSB Report
June 13, 1985 · Robinson R-22 · N9075Y
Dallas, TX
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 13, 1985
Injury Outcomes
No injuries (2 uninjured)
Location
Dallas, TX
Aircraft
Robinson R-22
Tail Number
N9075Y
Operator
W N Cope
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
FTW85FA254
THE STUDENT PLT ALLOWED THE MAIN ROTOR BLADES TO DROP TO A SLOW SPEED WELL BELOW THE GREEN ARC. THE STUDENT PLT AND THE INSTRUCTOR PLT ATTEMPTED TO DO A POWER RECOVERY FROM THE ABORTED AUTOROTATION MANEUVER BUT THE ENG COULD NOT ACCELERATE THE MAIN ROTOR BLADES AT AN ADEQUATE RATE DUE TO THE LOW INERTIA-TYPE BLADES. THE ENG DID DRIVE THE BLADES INTO A CONE SHAPE WHICH DID NOT DEVELOP ADEQUATE LIFT TO PREVENT THE HARD TOUCHDOWN LANDING. THE SPEARATED SECTION OF TAIL BOOM AND TAIL ROTOR DRIVE SHAFT WERE FOUND A GREAT DISTANCE FROM THE WRECKAGE DRIVEN BY THE MAIN ROTOR BLADE WHICH WAS DRIVEN BY THE ENG UNDER POWER. THE DEFORMED MAIN ROTOR BLADES SHOWED EVIDENCE OF CONEING. THE ONE BLADE TIP CONTACTED THE SOD SURFACE AND BENT DOWNWARD. THE SKID ASSY SEPARATED DUE TO THE HARD TOUCHDOWN.
Full Narrative
THE STUDENT PLT ALLOWED THE MAIN ROTOR BLADES TO DROP TO A SLOW SPEED WELL BELOW THE GREEN ARC. THE STUDENT PLT AND THE INSTRUCTOR PLT ATTEMPTED TO DO A POWER RECOVERY FROM THE ABORTED AUTOROTATION MANEUVER BUT THE ENG COULD NOT ACCELERATE THE MAIN ROTOR BLADES AT AN ADEQUATE RATE DUE TO THE LOW INERTIA-TYPE BLADES. THE ENG DID DRIVE THE BLADES INTO A CONE SHAPE WHICH DID NOT DEVELOP ADEQUATE LIFT TO PREVENT THE HARD TOUCHDOWN LANDING. THE SPEARATED SECTION OF TAIL BOOM AND TAIL ROTOR DRIVE SHAFT WERE FOUND A GREAT DISTANCE FROM THE WRECKAGE DRIVEN BY THE MAIN ROTOR BLADE WHICH WAS DRIVEN BY THE ENG UNDER POWER. THE DEFORMED MAIN ROTOR BLADES SHOWED EVIDENCE OF CONEING. THE ONE BLADE TIP CONTACTED THE SOD SURFACE AND BENT DOWNWARD. THE SKID ASSY SEPARATED DUE TO THE HARD TOUCHDOWN.
Flight
Event TypeAccident
Event Time18:15 CDT
Nearest AirportDallas Redbird (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson R-22
Tail NumberN9075Y
Aircraft CategoryHeli
DamageDestroyed
OperatorW N Cope
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 · Reciprocating · 160
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 35 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind135° @ 5 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time18:40
Weather SourcePILO