ASN Wikibase Occurrence # 133253
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| Date: | Monday 20 June 1994 |
| Time: | 19:30 LT |
| Type: |  Hughes 269C |
| Owner/operator: | U. S. Dept. Of Agriculture |
| Registration: | N7404F |
| MSN: | 650414 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 7604 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | London, TX -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Junction, TX (KJCT) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING A COYOTE ERADICATION FLIGHT, THE AIRCRAFT EXPERIENCED A PARTIAL POWER LOSS. THE PILOT STATED THAT WHILE HE WAS MANEUVERING AT LOW ALTITUDE AND AIRSPEED, HE FELT A VIBRATION THROUGH THE AIRFRAME, THE ENGINE AND MAIN ROTOR RPM BEGAN TO DECREASE, AND THE NEEDLES SPLIT. HE APPLIED FULL POWER, BUT THE ENGINE WOULD ONLY DEVELOP 2,000 RPM. WHILE THE PILOT WAS MANEUVERING TO A CLEAR AREA, THE MAIN ROTOR BLADES STRUCK TREES AND THE AIRCRAFT ROLLED TO THE RIGHT AND IMPACTED THE GROUND. FOLLOWING THE ACCIDENT, THE ENGINE WAS TEST RUN IN THE AIRFRAME AND FOUND TO BE RUNNING ROUGH. INVESTIGATION REVEALED THAT THE ENGINE CAMSHAFT LOBES WERE WORN BEYOND LIMITS AND THE #4 EXHAUST VALVE WAS HEAT DISCOLORED AND SHOWED SIGNS OF STICKING.
Probable Cause: THE PARTIAL POWER LOSS DUE TO A STICKING VALVE. FACTORS WERE THE REMAINING WORN LOBES ON THE CAMSHAFT AND THE LACK OF SUITABLE TERRAIN ONTO WHICH A SUCCESSFUL FORCED LANDING COULD BE EXECUTED.
Accident investigation:
 |
|
Sources:
NTSB FTW94GA204
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 12-Nov-2022 02:21 | Ron Averes | Updated [Operator, Narrative] |
| 10-Apr-2024 06:36 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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