NTSB Identification: LAX90DVD03.
The docket is stored on NTSB microfiche number 42361.
Accident occurred Monday, August 27, 1990 in STOCKTON, CA
Probable Cause Approval Date: 11/09/1992
Aircraft: Texas Helicopter M47A WASP, registration: N43921
Injuries: 1 Uninjured.

THE PILOT LANDED THE HELICOPTER AND IT WAS RELOADED WITH CHEMICALS FOR ANOTHER AGRICULTURAL SPRAYING FLIGHT. SHORTLY AFTER DEPARTING THE LOAD SITE, THE PILOT HEARD A LOUD SOUND ENAMATE FROM THE ENGINE AREA FOLLOWED BY A SUDDEN LOSS OF POWER AND VIBRATION. THE PILOT IMMEDIATELY EXECUTED AN AUTOROTATION TO THE OPEN AREA, BUT MISJUDGED THE FLARE ALTITUDE AND EXPERIENCED A HARD LANDING WHICH CAUSED SUBSTANTIAL DAMAGE TO THE HELICOPTER. THE INVESTIGATION REVEALED THAT THE RIGHT MAGNETO CONTACT POINTS FAILED.

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

THE PILOT MISJUDGED THE ALTITUDE DURING THE FLARE/TOUCHDOWN PHASE OF THE AUTOROTATION. FACTORS RELATING TO THIS ACCIDENT ARE FAILURE OF THE RIGHT MAGNETO.

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