ASN Wikibase Occurrence # 294606
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| Date: | Tuesday 24 August 2004 |
| Time: | 15:00 LT |
| Type: |  Robinson R-22 |
| Owner/operator: | Airman Testing And Training Inc. |
| Registration: | N4062X |
| MSN: | 2264 |
| Year of manufacture: | 1993 |
| Total airframe hrs: | 2537 hours |
| Engine model: | Lycoming 0320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West Palm Beach, Florida -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | West Plam Beach, FL |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the flight instructor, the student pilot was practicing autorotations with the instructor at an indicated altitude from about 1,500 to 500 feet. The flight instructor decided to fly back to their departure airport, and while doing so the flight instructor idled the helicopter engine to simulate an engine out for the student pilot. When the student pilot went to recover from the simulated engine out, the helicopter engine did not respond to any power inputs. The flight instructor heard a low RPM horn, and took over the flight controls of the helicopter. The instructor proceeded to re-enter autorotation, flared, leveled the helicopter, and landed in an uneven field. The helicopter came to rest on its side. The helicopter engine was removed from the airframe and taken to a certified engine overhaul facility with NTSB and FAA oversight. The engine operated through several parameters, engine start, magneto check, and a series of several rapid throttle advancements from idle, to full engine power. No abnormalities were noted with the test. A differential compression check was conducted and the following compressions were recorded: Cylinder one, 15/80 PSI, cylinder two, 15/80 PSI, cylinder three, 20/80 PSI, cylinder four, 15/80 PSI. The cylinders were removed, and sent to ECI, Engine Components Inc., for further examination of the pistons and cylinders, with FAA oversight. Pistons, pistons pins, and combustion chambers of all four cylinders displayed discoloration, consistent with of high engine temperature operation.
Probable Cause: The partial loss of engine power due to low cylinder compression during recovery from a practice autorotation resulting in a hard landing and damage to the helicopter.
Accident investigation:
 |
|
Sources:
NTSB MIA04LA122
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 06:52 | ASN Update Bot | Added |
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