ASN Wikibase Occurrence # 297697
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| Date: | Tuesday 31 December 2019 |
| Time: | 13:30 LT |
| Type: |  Enstrom F28 |
| Owner/operator: | |
| Registration: | N57SJ |
| MSN: | 278 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 3632 hours |
| Engine model: | Lycoming HIO-360-C1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Danbury, Texas -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Danbury, TX (07TA) |
| Danbury, TX (07TA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The student pilot turned the helicopter onto the crosswind leg of the traffic pattern during a training flight when the engine suddenly began to run rough and lost partial power. The flight instructor took the controls and executed an autorotation into a clearing. The skids of the helicopter sank into the soft mud, the rotor blades contacted the ground, and the helicopter rolled onto its side.
Examination of the engine revealed that a portion of the No. 3 cylinder intake valve had broken off and migrated into the No. 1 cylinder, where it lodged between the No. 1 cylinder's intake valve and seat, holding that valve in the open position and resulting in the partial loss of engine power.
Probable Cause: The failure of the engine's No.3 intake valve resulting is a loss of engine power and a rollover following the autorotation to soft ground.
Accident investigation:
 |
|
Sources:
NTSB CEN20LA051
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Oct-2022 07:30 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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