SEA04LA181 · Hughes 369D
Hughes 369D · Accident: loss of engine power en route
From Hobby Field (77S) to an unrecorded destination
Event
- NTSB case
- SEA04LA181
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Hughes 369D
- Aircraft type
- Hughes 369
- Category
- Helicopter
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N505ST
- Operator
- Darren Kronberger
- Onboard fatalities
- Unknown
- Route
- From Hobby Field (77S), Creswell, ORTo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · cruise
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Reason for occurrence undetermined
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
At 1,000 feet AGL the pilot said the engine had a sudden loss of power and the collective became very heavy. After the pilot initiated an autorotation, he looked down and observed a split in the rotor rpm and the N2 needle. The pilot then elected to proceed to a rock pit he observed and initiated an autorotation. At 60 knots and 30 feet AGL, and just as the pilot pulled back on the cyclic to slow down, the helicopter impacted the ground with its left skid. The helicopter subsequently rolled over on its left side, sustaining substantial damage as the main rotor blades severed the tail boom. A post accident examination of the helicopter failed to reveal any anomalies which would have prevented normal operations.
Probable cause
In-flight loss of engine power during cruise for undetermined reasons.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record SEA04LA181
- Event ID
- 20040909X01372
- Case number
- SEA04LA181
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: local date, investigation status, coordinates. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2004-09-04.
- API snapshot SHA-256: a93a20fecccde650c84e19d99bba5bcc7ecba87a979ad25c7d68d46a0be063c4; retrieved 2026-09-22T06:46:30.451Z.