NTSB Identification: CHI88LA108.
The docket is stored on NTSB microfiche number 36206.
Accident occurred Saturday, May 07, 1988 in MINNEAPOLIS, MN
Probable Cause Approval Date: 06/07/1989
Aircraft: HUGHES 269B, registration: N9487F
Injuries: 1 Minor,2 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.

THE PILOT WAS EXECUTING A DOWNWIND TAKEOFF, THE WINDS REPORTEDLY GUSTING TO 25 KNOTS, LOADED WITH TWO PASSENGERS, WHEN JUST AFTER TAKEOFF THE PILOT STATED THE HELICOPTER EXPERIENCED A LOSS OF POWER. THE PILOT THEN ATTEMPTED TO EXECUTE AN AUTOROTATION, BUT DURING THE EMERGENCY DESCENT THE PILOT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL. AS A RESULT THE HELICOPTER STRUCK A MOVING VEHICLE WITH ITS TAIL ROTOR AND SUBSEQUENTLY COLLIDED WITH THE TERRAIN. THE HELICOPTER WAS APPROXIMATELY 130 LBS UNDER GROSS WT AT THE TIME OF TAKEOFF. WHEN EXAMINED AND TESTED THE ENGINE OPERATED NORMALLY AND NO MECHANICAL MALFUNCTIONS WERE FOUND. EXAMINATION OF THE ENGINE DID REVEAL THAT A FUEL NOZZLE HAD BEEN INSTALLED IN THE AIRCRAFT'S FUEL SYSTEM WITH A RESTRICTOR MISSING BUT TO COMPENSATE FOR THE MISSING RESTRICTOR THE FUEL SERVO IDLE MIXTURE WAS SET AT A VERY LEAN SETTING. THIS WAS DETERMINED NOT TO BE A FACTOR IN THE ACCIDENT.

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

PREFLIGHT PLANNING/PREPARATION..IMPROPER..PILOT IN COMMAND

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

ADEQUATE ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND

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

WIND INFORMATION..DISREGARDED..PILOT IN COMMAND




Contributing Factors

TERRAIN CONDITION..DOWNHILL


Contributing Factors

WEATHER CONDITION..TAILWIND


Contributing Factors

WEATHER CONDITION..GUSTS

Index for May1988 | Index of months