ASN Wikibase Occurrence # 364308
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| Date: | Saturday 26 October 1991 |
| Time: | 15:15 LT |
| Type: |  Aerospatiale AS350B |
| Owner/operator: | Lone Eagle Aviation, Inc. |
| Registration: | N9001S |
| MSN: | 1022 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 6641 hours |
| Engine model: | TURBOMECA ARRIEL 1B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Scottsdale, AZ -
 United States of America
|
| Phase: | Taxi |
| Nature: | Training |
| Departure airport: | Scottsdale, AZ (KSDL) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE CERTIFICATED COMMERCIAL PILOT/CERTIFIED FLIGHT INSTRUCTOR WAS CONDUCTING TRAINING WITH A SECOND PILOT IN HELICOPTER EMERGENCY PROCEDURES, THAT INCLUDED HYRAULICS OFF LANDINGS. ON THE THIRD LANDING WITHOUT HYRAULIC BOOST PRESSURE, AT AN AIRSPEED OF ABOUT 2 KNOTS AND A SKID HEIGHT OF ABOUT 1 FOOT, THE HELICOPTER BEGAN AN UNCOMMANDED TURN TO THE LEFT. THE PILOT ATTEMPTED TO COUNTER THE TURN BUT WAS UNABLE TO MOVE THE FLIGHT CONTROLS. THE HELICOPTER'S LEFT BANK ANGLE, NOSE DOWN ATTITUDE AND LEFT TURN CONTINUED UNTIL THE MAIN ROTOR BLADES STRUCK THE GROUND. THE LEFT FRONT PORTION OF THE FUSELAGE AND SKID TUBE THEN STRUCK THE GROUND. AN EXAMINATION OF THE HYDRAULIC SYSTEM, INCLUDING DISASSEMBLY OF THE MAIN ROTOR CONTROL SERVOS, FAILED TO LOCATE THE CAUSE OF THE MALFUNCTION. THIS IS THE SECOND RPTD HYD OFF FLT CONTROL SEIZURE THAT RESULTED IN AN ACCIDENT. THE FLT CREW OF BOTH HELICOPTERS WERE WELL QUALIFIED.
Probable Cause: AN UNDETERMINED MALFUNCTION OF THE HYDRAULIC SYSTEM IN WHICH THE SYSTEM WAS LOCKED, PREVENTING THE MOVEMENT OF THE FLIGHT CONTROLS, AND LOSS OF DIRECTIONAL CONTROL.
Accident investigation:
 |
|
Sources:
NTSB LAX92FA025
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 13:48 | ASN Update Bot | Added |
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