NTSB Identification: LAX82FVD16
14 CFR Part 91: General Aviation
Accident occurred Friday, May 07, 1982 in FREMONT, CA
Probable Cause Approval Date: 05/07/1983
Aircraft: SCORPION 133, registration: N19NS
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE STUDENT PILOT, BUILDER OF THE HELICOPTER WAS ON A DUAL INSTRUCTIONAL FLIGHT WITH AN INSTRUCTOR PILOT (IP). THE STUDENT HAD ABOUT 71 HOURS IN THIS MAKE AND MODEL WHILE THE IP HAD 18 HOURS. AFTER MAKING TWO LANDINGS, A DESCENDING TURN WAS MADE TO A DOWNWIND AT ABOUT 15 FT AGL TO DEMONSTRATE THE RELATIONSHIP BETWEEN AIRSPEED AND GROUND SPEED. AFTER THAT, THE IP INSTRUCTED THE STUDENT TO FOLLOW THROUGH AS HE (THE IP) WAS GOING TO MAKE A CLIMBING TURN TO POSITION THE HELICOPTER FOR A NORMAL LANDING PATTERN. DURING THE CLIMB, THE IP FELT INTERFERENCE ON THE CONTROLS FROM THE STUDENT. THE AIRSPEED DROPPED NEAR ZERO AND THE HELICOPTER WAS ABOUT TO START SETTLING WITH POWER. REPORTEDLY, THE IP OVERPOWERED THE CONTROLS AND STARTED A RECOVERY, BUT NOT IN TIME TO AVOID CONTACTING THE GROUND. THE HELICOPTER TOUCHED DOWN HARD, TILTED TO THE LEFT, AND A MAIN ROTOR BLADE STRUCK THE TAIL BOOM. THE IP SAID THE STUDENT WAS RELUCTANT TO RELEASE THE CONTROLS WHEN INSTRUCTED TO DO SO.

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

CREW/GROUP COORDINATION..INADEQUATE..PILOT IN COMMAND(CFI)

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

CONTROL INTERFERENCE..INITIATED..DUAL STUDENT

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

AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND(CFI)

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

DESCENT..EXCESSIVE..PILOT IN COMMAND(CFI)

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