ASN Wikibase Occurrence # 292166
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| Date: | Tuesday 20 June 2006 |
| Time: | 09:30 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Pathfinder Leasing LLC |
| Registration: | N88SE |
| MSN: | 800775D |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 4610 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Salt Lake City, Utah -
 United States of America
|
| Phase: | Unknown |
| Nature: | Cargo |
| Departure airport: | Bountiful-Salt Lake Skypark, UT (BTF/KBTF) |
| Bountiful-Salt Lake Skypark, UT (BTF/KBTF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While placing an air conditioning unit on top of a commercial building, the pilot heard the main rotor pitch droop, and confirmed that the rotor rpm was beginning to decrease. He then confirmed the throttle was open in the full flight position, moved the load away from the personnel on the roof, and lowered the collective. The low rotor audio sounded, and the rotor rpm continued to decrease, so the pilot hit the load release switch and autorotated to an emergency landing on top of the roof. After a hard touchdown, the aircraft bounced, touched down again, and then balanced on the right skid before very slowly rolling onto its right side. The load he was placing on the roof weighed less than one-half of what the helicopter was capable of lifting under the ambient conditions, and neither an engine/airframe inspection nor a test run of the engine were able to establish any anomalies or the initiating factor in the rotor droop event.
Probable Cause: A loss of rotor rpm for undetermined reasons, resulting in a hard landing on top of the commercial building over which the helicopter was working.
Accident investigation:
 |
|
Sources:
NTSB SEA06LA124
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 15:15 | ASN Update Bot | Added |
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