NTSB Identification: LAX92LA301.
The docket is stored on NTSB microfiche number 47131.
Accident occurred Friday, July 17, 1992 in FRESNO, CA
Probable Cause Approval Date: 08/31/1993
Aircraft: ROBINSON R-22, registration: N83556
Injuries: 1 Fatal,1 Serious.

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 CFI DEMONSTRATED A RIGHT CIRCLING CONFINED AREA APPROACH IN A STAND OF OAK TREES AFTER FLYING OVER THE AREA. HE THEN INSTRUCTED THE DUAL STUDENT TO PERFORM THE MANEUVER. AFTER THE DUAL STUDENT COMPLETED TWO SUCCESSFUL CONFINED AREA APPROACHES TO A HOVER, THE CFI ASSUMED THE CONTROLS AND DEPARTED STRAIGHT OUT OVER THE LOWEST SECTION OF THE TREES. SECONDS LATER THE HELICOPTER STRUCK SOME POWER LINE WIRES THAT WERE PARTIALLY OBSTRUCTED FROM VIEW BY THE TREES.

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

THE CFI'S POOR IN-FLIGHT DECISION TO PROCEED OVER THE TREES INSTEAD OF THE PREVIOUSLY PERFORMED RIGHT CIRCLING TURNS AND BOTH PILOTS INADEQUATE VISUAL LOOK-OUT. CONTRIBUTING TO THIS ACCIDENT WERE THE TREES THAT PARTIALLY OBSTRUCTED THE VIEW OF THE POWER LINE WIRES.

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