ASN Wikibase Occurrence # 238584
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| Date: | Tuesday 21 July 2020 |
| Time: | 05:58 LT |
| Type: |  MD Helicopters MD 600N |
| Owner/operator: | MP Aviation LLC |
| Registration: | N208MP |
| MSN: | RN042 |
| Year of manufacture: | 1998 |
| Total airframe hrs: | 2984 hours |
| Engine model: | Rolls Royce M250-C47M |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Thompson Falls, Sanders County, MT -
 United States of America
|
| Phase: | Landing |
| Nature: | Cargo |
| Departure airport: | Thompson Falls, MT |
| Thompson Falls, MT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While on an approach to the landing zone, the pilot lowered the collective to start a vertical descent to land. At that time, the engine and rotor speeds suddenly decreased, the helicopter yawed to the left and started to settle. Because the helicopter was approaching the ground fast, the pilot increased the collective to use the remaining engine power to cushion the landing. The helicopter impacted the ground, and the pilot rolled the throttle to idle, but noticed that engine speed and rotor rpm gauges were below the normal idle parameters. When he rolled the throttle to off, he heard a grinding "metal-to-metal" noise, and the rotor blades stopped spinning almost immediately.
Data downloaded from the onboard incident recorder captured a 'low rotor RPM' event during the flight, followed by 'Flameout' and 'Ng Low' triggers. According to the data, the full authority digital engine control system (FADEC) attempted to re-light the engine for the next 53 seconds until the throttle was rolled to cut-off; however, the engine did not restart.
A postaccident examination of the engine revealed no evidence of any preimpact mechanical malfunctions or failures that would have precluded normal operation, and the reason for the low rotor rpm triggering event could not be determined.
Probable Cause: A partial loss of engine power for reasons that could not be determined based on available evidence.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA235
History of this aircraft
Other occurrences involving this aircraft
| 6 February 2007 | N451DL | K-Tek Aircraft LLC | 0 | Vicksburg, Mississippi | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Jul-2020 01:09 | Captain Adam | Added |
| 03-Mar-2021 21:04 | rudy | Updated |
| 15-Jul-2022 11:02 | ASN Update Bot | Updated [Time, Total occupants, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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