ASN Wikibase Occurrence # 361585
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| Date: | Friday 30 July 1993 |
| Time: | 10:30 LT |
| Type: | Continental Copters El Tomcat Mk V-A |
| Owner/operator: | Penn-tex Helicopters, Inc. |
| Registration: | N9014T |
| MSN: | CC174-5 |
| Total airframe hrs: | 3786 hours |
| Engine model: | LYCOMING VO-435-A1F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Duson, LA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE ENGAGED IN AN AERIAL APPLICATION OPERATION, THE PILOT HEARD BANGING NOISES AND THE ENGINE BEGAN TO OVERSPEED. ALTHOUGH COLLECTIVE CONTROL WAS INEFFECTIVE, THE PILOT WAS ABLE TO MANEUVER THE HELICOPTER TO A HARD LANDING USING THROTTLE AND PARTIAL CYCLIC CONTROL. POST ACCIDENT INVESTIGATION DISCLOSED THE TRANSMISSION MAST BEARING HAD FAILED, CONTAMINATING THE OIL WITH STEEL PARTICLES THAT OBSTRUCTED THE INTERNAL OIL PASSAGES.
Probable Cause: FAILURE OF THE TRANSMISSION MAST BEARING, RESULTING IN OIL CONTAMINATION AND SUBSEQUENT BLOCKAGE OF THE INTERNAL OIL PORTS AND PASSAGES. FACTORS WERE: TOTAL LOSS OF COLLECTIVE CONTROL AND PARTIAL LOSS OF CYCLIC CONTROL.
Accident investigation:
 |
|
Sources:
NTSB DEN93LA091
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 20:01 | ASN Update Bot | Added |
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