NTSB Identification: ATL87LA040.
The docket is stored on NTSB microfiche number 32354.
Accident occurred Wednesday, December 10, 1986 in CHARLOTTE, NC
Aircraft: HUGHES 269C, registration: N58188
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE FLYING AT 300' TO 500' AGL ON A CABLE PATROL FLT, THE PLT HEARD A LOUD LOISE. THE ROTOR RPM STARTED TO DECAY & THE ENG RPM INCREASED SHARPLY. THE PLT INITIATED AN AUTOROTATION TO A PARKING LOT, BUT HAD TO MANEUVER TO AVOID TREES & A VEHICLE. THE HELICOPTER TOUCHED DOWN HARD ON THE RGT SKID, COLLAPSING THE SKID & DAMAGING THE MAIN ROTOR BLADES. AN INV REVEALED THE FORWARD COUPLING SPLINES ON THE LOWER PULLEY DRIVE SHAFT, PN 269A5559-3, HAD FAILED, EFFECTIVELY DISCONNECTING THE ENG FROM THE MAIN ROTOR. THE BOOT FOR RETAINING THE LUBRICANT IN THE SPLINE AREA WAS MISSING & THE SPLINE & RECEPTACLE WERE DRY OF LUBRICANT. THE ACDNT OCCURRED ABOUT 71 HRS AFTER THE COUPLINGS HAD BEEN REPACKED WITH LUBRICANT.

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

ROTOR DRIVE SYSTEM,ENGINE TO TRANSMISSION DRIVE..FAILURE,PARTIAL

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

MAINTENANCE..IMPROPER..COMPANY MAINTENANCE PERSONNEL



Contributing Factors

TERRAIN CONDITION..HIGH OBSTRUCTION(S)


Contributing Factors

OBJECT..VEHICLE

Index for Dec1986 | Index of months