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| Date: | Thursday 9 July 2020 |
| Time: | |
| Type: |  Boeing 737-8CX (WL) |
| Owner/operator: | MIAT - Mongolian Airlines |
| Registration: | EI-CXV |
| MSN: | 32364/1166 |
| Year of manufacture: | 2002 |
| Engine model: | CFMI CFM56-7B |
| Fatalities: | Fatalities: 0 / Occupants: 174 |
| Other fatalities: | 0 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | over China -
 China
|
| Phase: | En route |
| Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
| Departure airport: | Seoul-Incheon International Airport (ICN/RKSI) |
| Buyant-Ukhaa International Airport (ULN/ZMUB) | |
| Investigating agency: | AAIB Mongolia |
| Confidence Rating: |  Accident investigation report completed and information captured |
The aircraft, a Boeing 737-800, diverted to Beijing following the in-flight shutdown of one of the engines.
The flight departed Seoul-Incheon at 02:23 UTC. At 02:56 engine speed values for engine no.1 began to drop, followed by a master warning and a low oil pressure light.
The flight crew reported an engine failure and issued a "Pan pan" alarm, asking for permission to descend to 5,800 meters. At 02:58, the flight crew shut down the left engine.
The flight diverted to Beijing International Airport, where it landed safely at 05:21 UTC.
Probable causes
In 2017, 2018, 2019, and 2020, the aircraft began operating 30-80 percent of all flights over short distances (Ulaanbaatar-Khanbumbat) due to extreme weather conditions, hot and dusty aerodromes, resulting in loss of internal engine cooling. The HPT Nozzle caused fatigue and damage to the engine.
Contributing factors
- In the event of icing at an altitude of 17.749 feet, when the outside air temperature reaches +10° C (SAT -8° C) as measured by the Total Air Temperature, the flight crew does not switch on the engine anti-ice
- The aircraft's CFM56-7B26, S / N 890116 left engine HPT NGV TE [Trailing Edge of Nozzle Guide Vanes of the High Pressure Turbine] was damaged.
- During about 100 cycles of flight, the engine's air temperature reserve (EGT Margin) decreases by 10° C and changes sharply.
Accident investigation:
 |
|
Sources:
AAIB Mongolia
History of this aircraft
Other occurrences involving this aircraft
| 3 May 2016 | EI-CXV | MIAT - Mongolian Airlines | 0 | Khovd Airport (HVD/ZMKD) |  |
min |
| Runway excursion | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Aug-2021 17:20 | harro | Added |
| 18-Aug-2021 18:40 | harro | Updated [Destination airport, Narrative, ] |
| 23-Dec-2021 20:37 | harro | Updated [Destination airport, Accident report, ] |
| 19-Jul-2023 13:46 | harro | Updated |
Corrections or additions? ... Edit this accident description
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