ASN Wikibase Occurrence # 297808
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| Date: | Saturday 3 August 2019 |
| Time: | 14:05 LT |
| Type: |  Robinson R44 II |
| Owner/operator: | Wallin Agricultural Aviation |
| Registration: | N440EM |
| MSN: | 13503 |
| Year of manufacture: | 2013 |
| Total airframe hrs: | 588 hours |
| Engine model: | Lycoming IO-540-AE1AB |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lyons, Nebraska -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Lyons, NE |
| Lyons, NE | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot of the agricultural aerial application flight stated that as the helicopter entered the field to be sprayed, the low rotor rpm annunciation sounded. He attempted to recover rotor rpm, but the rpm continued to decay rapidly. He then used the remaining rotor rpm to cushion a landing onto the field. As the helicopter touched down, it slid about 150-200 ft before the skid dug into soft dirt and the helicopter rolled over. Post-accident examination of the engine by the operator revealed that the no. 6 cylinder had more leakage/lower compression than the previous 100-hour recorded compression checks. Reduced compression on one or more cylinders would have reduced excess power available to maintain a rotor RPM and altitude.
Probable Cause: The engine's low cylinder compression, which resulted in low rotor rpm and a subsequent dynamic rollover following landing on soft terrain.
Accident investigation:
 |
|
Sources:
NTSB CEN19LA250
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Oct-2022 08:52 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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