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) |
Destination airport: | Walikale |
Confidence Rating: | Information is only available from news, social media or unofficial sources |
Narrative: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] |
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