NTSB Identification: FTW85FA254.
The docket is stored on NTSB microfiche number 30371.
Accident occurred Thursday, June 13, 1985 in DALLAS, TX
Aircraft: Robinson R-22, registration: N9075Y
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

EMERGENCY PROCEDURE..IMPROPER..DUAL STUDENT

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRCRAFT HANDLING..IMPROPER..DUAL STUDENT

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,SKID ASSEMBLY..SEPARATION

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,SKID ASSEMBLY..OVERLOAD

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRCRAFT HANDLING..IMPROPER..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AUTOROTATION..IMPROPER..DUAL STUDENT

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