ASN Wikibase Occurrence # 374287
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| Date: | Monday 1 September 1986 |
| Time: | 11:50 LT |
| Type: |  Enstrom F-28C |
| Owner/operator: | Trans Rotor, Inc. |
| Registration: | N549H |
| MSN: | 345 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 1132 hours |
| Engine model: | LYCOMING HIO-360-E1AD |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Coshocton, OH -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT INITIATED A MAXIMUM POWER TAKEOFF FROM A CONFINED PARKING LOT WITH 2 PASSENGERS ON BOARD. THE AREA WAS BOARDERED BY OBSTRUCTIONS & PEOPLE. THE PLT RPRTD THAT DURING LIFT-OFF, SHE INCREASED POWER TO 2900 RPM, LIFTED OFF TO A 4' HOVER WITH 33' OF MANIFOLD PRESSURE, THEN BEGAN A MAX PERFORMANCE TAKEOFF, 'PULLING POWER AND TURNING THROTTLE' FOR EXTRA RPM WITH SLOW FORWARD SPEED, REACHING 36' OF MANIFOLD PRESSURE. AT APRX 15' AGL, THE PLT NOTED A DECREASE IN RPM. SHE INCREASED THROTTLE APPLICATION, THEN DECREASED THE COLLECTIVE, BUT WAS UNABLE TO RECOVER THE LOSS OF RPM. SHE MADE A LEFT PEDAL TURN TO AVOID OBSTRUCTIONS & PEOPLE. SUBSEQUENTLY, THE HELICOPTER TOUCHED DOWN HARD & WAS DAMAGED. AN EXAM OF THE ENG DID NOT REVEAL ANY DEFECTS. THE FLT MANUAL WARNED THAT LOSS OF ROTOR & ENG RPM WOULD FOLLOW WHEN THE ENG WAS OVERBOOSTED. AT 36.5' OF MANIFOLD PRESSURE, THE POP-OFF VALVE WOULD HAVE ACTIVATED WHICH WOULD HAVE RESULTED IN A SLIGHT POWER LOSS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB ATL86LA236
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Mar-2024 07:53 | ASN Update Bot | Added |
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