ASN Wikibase Occurrence # 201992
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| Date: | Saturday 27 February 1999 |
| Time: | 13:56 LT |
| Type: |  Enstrom F-28F |
| Owner/operator: | Hiro Takai |
| Registration: | N5700C |
| MSN: | 514 |
| Total airframe hrs: | 2335 hours |
| Engine model: | Lycoming HIO-360-F1AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Jose, CA -
 United States of America
|
| Phase: | Take off |
| Nature: | Unknown |
| Departure airport: | (KRHV) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and a mechanic were performing a postmaintenance test flight following tracking of the main rotor blades. One test flight had already been accomplished with no discrepancies. The pilot had not flown the helicopter during the preceding 90 days. As the pilot pulled the collective, the aircraft suddenly came to a 4-foot hover with the fuselage swinging side to side and fore and aft below the main rotor. The pilot attempted to recover; however, the aircraft pitched forward, the main rotor blades struck the ground, and the aircraft rolled onto its right side. The pilot said he thought he might have mispositioned the cyclic before raising the collective as he was attempting to comply with the mechanic's request to 'pull-off before vibration became a problem.' He said the controls 'felt' differently than he had expected. A detailed control system inspection found no evidence of preexisting discrepancies.
Probable Cause: The loss of aircraft control due to the pilot's sudden application of collective combined with excessive cyclic inputs.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA112
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Nov-2017 10:01 | ASN Update Bot | Added |
| 08-Apr-2024 09:13 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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