NTSB Identification: FTW82DA150
14 CFR Part 91: General Aviation
Accident occurred Monday, April 26, 1982 in HOUSTON, TX
Probable Cause Approval Date: 04/26/1983
Aircraft: AEROSPATIALE AS-350D, registration: N5784Y
Injuries: 2 Uninjured.

THE PURPOSE OF THE FLIGHT WAS FOR THE PILOT TO PRACTICE MANEUVERS IN PREPARATION FOR A PART 135 CHECK RIDE. THE PILOT WAS PRACTICING POWER RECOVERY AUTOROTATIONS TO A HEIGHT OF ABOUT 5 FT AG. HE REPORTED THAT ON HIS FOURTH AUTOROTATION, THE ENGINE DID NOT ACCELERATE WHEN HE ATTEMPTED THE POWER RECOVERY. SUBSEQUENTLY, THE HELICOPTER FELL THROUGH THE RECOVERY AND LANDED HARD. DURING THE INVESTIGATION, THE ENGINE FUEL CONTROL AND POWER TURBINE GOVERNOR WERE REMOVED FOR EXAMINATION. THE GOVERNOR WAS FOUND TO BE WITHIN SPECIFICATIONS. HOWEVER, AN EXAMINATION OF THE FUEL CONTROL UNIT REVEALED THE PX TRIM BLEED PART WAS OVERSIZE. THE SPECIFICATION CALLED FOR A SIZE #64 TO #68 PART, BUT A #61 PART WAS INSTALLED. ALSO, THERE WAS SOME WEAR ON THE BELLOWS. ACCORDING TO BENDIX CORP, THE OVERSIZE PART AND WEAR WOULD HAVE LEANED THE MIXTURE, BUT WOULD NOT HAVE CAUSED THE POWER LOSS.

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

REASON FOR OCCURRENCE UNDETERMINED


Contributing Factors

FLARE..MISJUDGED..PILOT IN COMMAND


Contributing Factors

MAINTENANCE..IMPROPER..OTHER MAINTENANCE PERSONNEL

Index for Apr1982 | Index of months