ASN Wikibase Occurrence # 353145
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| Date: | Monday 21 June 1999 |
| Time: | 19:30 LT |
| Type: |  RotorWay Exec 90 |
| Owner/operator: | Private |
| Registration: | N4359N |
| MSN: | 5042 |
| Total airframe hrs: | 125 hours |
| Engine model: | Rotorway RI 162 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lutz, FL -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | (X39) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The non-certificated pilot preflighted the helicopter and after engine start, one of the magnetos was intermittent. Manipulation of the magneto switch corrected the problem; the flight then departed and flew about 5 miles away. While returning, the non-rotorcraft rated passenger began flying the helicopter and while descending over the airport about 300 feet, the engine quit. The passenger lowered full collective, maintained 60 mph, then when the helicopter was 20 feet agl, he flared using a 45 degree flare angle. The tailboom contacted the ground first, followed by the main rotor blades contacting the tailboom. The helicopter then landed hard. The passenger stated after takeoff, the pilot performed 3 or 4 simulated loss of engine power with power recoveries and while performing another, the engine quit at 100-150 feet. He took the controls from the pilot and with the main rotor tachometer indicating 0, performed an autorotative landing but the helicopter landed hard. The engine was started postaccident and found to operate normally. Examination of the engine systems revealed no evidence of preimpact failure or malfunction. The pilot stated that he found corrosion at the wiring connections at each ignition pack. Preflight examination of the ignitions packs is required.
Probable Cause: The excessive cyclic input by the non-qualified passenger during the autorotative landing following a reported loss of engine power. A factor in the accident was the inadequate preflight of the helicopter by the unqualified pilot for his failure to detect corrosion at each ignition pack during the helicopter preflight, resulting in the loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB MIA99LA186
History of this aircraft
Other occurrences involving this aircraft
| 4 July 2005 | N4359N | Private | 0 | Weston, WV | |
w/o |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Mar-2024 10:49 | ASN Update Bot | Added |
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