ASN Wikibase Occurrence # 366233
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| Date: | Friday 7 September 1990 |
| Time: | 09:45 LT |
| Type: |  Robinson R22A |
| Owner/operator: | Helistream, Inc. |
| Registration: | N85594 |
| MSN: | 0473 |
| Year of manufacture: | 1985 |
| Engine model: | LYCOMING O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Beatty, NV -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT PROVIDED HIS PASSENGER WITH A LOW ALTITUDE AERIAL SURVEY OF A RACE CAR ROUTE WHICH INVOLVED FLYING OVER MOUNTAINOUS TERRAIN BETWEEN 100 AND 150 ABOVE GROUND LEVEL. DURING THE FLIGHT THE HELICOPTER ENTERED AN AREA OF RAPIDLY RISING TERRAIN, AND THE LOW ROTOR RPM WARNING HORN SOUNDED. THE PILOT STATED THAT HE DID NOT IMMEDIATELY LOWER THE COLLECTIVE. HE STATED, HOWEVER, THAT HE ATTEMPTED TO REGAIN ROTOR RPM WHILE MANEUVERING THE HELICOPTER IN A LEFT TURN TO REVERSE COURSE. THE PILOT FURTHER INDICATED THAT THE HELICOPTER DID NOT HAVE SUFFICIENT ALTITUDE AND AIRSPEED SO HE ATTEMPTED TO LAND. THE PILOT ENTERED AN AUTOROTATIVE DESCENT. THE HELICOPTER TOUCHED DOWN HARD ON THE SLOPING TERRAIN AND ROLLED OVER. THE CRASH SITE'S ELEVATION WAS 6,300 FEET MSL. THE CALCULATED DENSITY ALTITUDE WAS AT LEAST 9,000 FEET.
Probable Cause: THE PILOT'S SELECTION OF AN INADEQUATE CRUISE ALTITUDE AND HIS FAILURE TO MAINTAIN ADEQUATE ROTOR RPM. CONTRIBUTING FACTORS RELATED TO THE HIGH DENSITY ALTITUDE, RISING TERRAIN, AND THE PILOT'S DELAYED AND IMPROPER USE OF THE COLLECTIVE.
Accident investigation:
 |
|
Sources:
NTSB LAX90LA317
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 18:47 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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