ASN Wikibase Occurrence # 362109
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| Date: | Wednesday 5 May 1993 |
| Time: | 17:45 LT |
| Type: |  Robinson R-22 |
| Owner/operator: | Private |
| Registration: | N80156 |
| MSN: | 0993 |
| Year of manufacture: | 1989 |
| Total airframe hrs: | 1614 hours |
| Engine model: | LYCOMING O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Davis, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Executive |
| Departure airport: | Napa, CA (KAPC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT DEPARTED FROM THE CONFINED AREA LANDING ZONE DOWNWIND. DURING THE INITIAL CLIMB THE HELICOPTER LOST TRANSLATIONAL LIFT. THE PILOT ADDED MORE COLLECTIVE AND INCREASED THE THROTTLE TO MAXIMUM RPM, BUT WITHOUT SUCCESS, AND THE ROTOR RPM BEGAN TO DECAY. THE HELICOPTER'S LEFT SKID CONTACTED THE TOMATO BED WHILE MOVING FORWARD AND IN A RIGHT YAWING TURN, AND THE HELICPTER ROLLED OVER. THE R-22 PILOT'S OPERATING HANBOOK STATES 'NEVER MAKE TAKE-OFFS OR LANDINGS DOWNWIND...THE RESULTING LOSS OF TRANSLATIONAL LIFT CAN CAUSE THE AIRCRAFT TO SETTLE INTO GROUND OBSTACLES.' IN ADDITION, THE MANUFACTURER ISSUED SAFETY NOTICE RSN-4 WHICH STATES, IN PART, 'POWER IS DIRECTLY PROPORTIONAL TO RPM. IF YOU RAISE THE COLLECTIVE TO STOP THE SHIP FROM SETTLING, YOU WILL PULL THE RPM DOWN EVEN LOWER AND SETTLE EVEN FASTER.'
Probable Cause: THE PILOT'S FAILURE TO FOLLOW A SAFETY TIP IN THE PILOT'S OPERATING HANDBOOK TO NEVER MAKE A DOWNWIND TAKEOFF, HIS FAILURE TO MAINTAIN ROTOR RPM, AND HIS IMPROPER USE OF THE HELICOPTER FLIGHT CONTROLS. A FACTOR WHICH CONTRIBUTED TO THE ACCIDENT WAS THE TAILWIND.
Accident investigation:
 |
|
Sources:
NTSB LAX93LA203
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Mar-2024 17:49 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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