ASN Wikibase Occurrence # 68133
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| Date: | Tuesday 18 December 2007 |
| Time: | 12:30 |
| Type: |  Mil Mi-8MTV-1 |
| Owner/operator: | UTair, opf. MONUC |
| Registration: | RA-25492 |
| MSN: | 95637 |
| Year of manufacture: | 1991 |
| Fatalities: | Fatalities: 1 / Occupants: 11 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Matanda -
 Congo (Democratic Republic)
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Goma Airport (GOM/FZNA) |
| Walikale | |
| Confidence Rating: |  Information is only available from news, social media or unofficial sources |
The Mi-8 helicopter crash occurred during a forced landing in a mountainous area, due to the failure of the left engine, which the crew mistakenly took as a rejection of the main gearbox.
The accident was the result of a combination of the following factors:
- Left engine failure in flight, which occurred due to loss of efficiency of the turbine compressor, as a result of contact with its flow part of blades destroyed nozzle apparatus of the first stage.
The reason for the destruction of the nozzle was a hot spot and the thermal deformation of the shell and the outer clamping ring, due, most likely, a significant non-uniformity of temperature field in front of the nozzle device due to disruptions in the fuel injector reservoir.
- Crew failed to detect a left engine failure due to a grinding noise in the area of the main gearbox, which prevented the crew to properly assess all available information and identify the failure;
- Erroneous assessment of the CF values in the gradient (about 35 degrees) in the location of the forced landing, which led to the rotor blades striking terrain
Sources:
1. https://mak-iac.org/russian/investigations/2007/mi-8_ra-25492.html
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Sep-2009 02:41 | harro | Added |
| 04-Mar-2011 11:47 | TB | Updated [Operator, Location, Source, Narrative] |
| 15-Mar-2011 16:40 | TB | Updated [Aircraft type] |
Corrections or additions? ... Edit this accident description
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