ASN Wikibase Occurrence # 22709
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| Date: | Thursday 11 August 1994 |
| Time: | 12:15 LT |
| Type: |  Aérospatiale AS 350D |
| Owner/operator: | Hawaiian Heli-jet Inc. |
| Registration: | N889AT |
| MSN: | 1332 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 7395 hours |
| Engine model: | Lycoming LTS-101-A3 |
| Fatalities: | Fatalities: 0 / Occupants: 7 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 2 mi W of Kukuihaele, Hawaii, HI -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Hilo, HI (ITO) |
| Waimea, HI (MUE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING A SIGHTSEEING HELICOPTER TOUR FLIGHT AT 1200 FEET AGL, THE PILOT HEARD AND THEN NOTICED A DECREASE IN THE MAIN ROTOR RPM. THE PILOT BEGAN A PRECAUTIONARY LANDING TO A BOULDER-COVERED LEDGE ABOUT 50 FEET FROM THE SURF LINE. WHEN THE PILOT ADDED POWER FOR THE LANDING, THE ENGINE FAILED TO RESPOND AND THE MAIN ROTOR RPM HORN SOUNDED. AFTER TOUCHDOWN, THE MAIN ROTOR AND TAIL ROTOR BLADES STRUCK THE ROCKS AND THE HELICOPTER ROLLED ONTO ITS RIGHT SIDE. A SUBSEQUENT ENGINE EXAMINATION REVEALED A FATIGUE CRACK IN A STEEL 'T' FITTING THAT ATTACHED THE PNEUMATIC PG ACCUMULATOR TO THE POWER TURBINE GOVERNOR. THE CRACK WAS LOCATED IN THE CHANNEL OF THE FITTING WHERE THE ADJACENT NUT RETENTION WIRE IS WRAPPED. A METALLURGICAL EXAMINATION REVEALED NO OTHER CONDITIONS THAT MAY HAVE CONTRIBUTED TO THE INITIATION OF THE CRACK.
Probable Cause: a fatigue crack in the 'T' fitting on the power turbine governor pneumatic accumulator. A factor was the rough, rock-covered landing area.
Accident investigation:
 |
|
Sources:
NTSB LAX94FA317
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=889AT
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Sep-2008 10:48 | Vaclav Kudela | Added |
| 24-Jun-2014 18:10 | Dr. John Smith | Updated [Time, Total fatalities, Total occupants, Other fatalities, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 02-Jul-2014 21:20 | Dr. John Smith | Updated [Nature, Departure airport, Source, Narrative] |
| 21-Dec-2016 19:14 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 15-Jun-2023 04:52 | Ron Averes | Updated [[Time, Damage, Category, Investigating agency]] |
| 10-Apr-2024 05:25 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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