As the WS - 10 engines and AL - 31 engines of the structure and shape of the nozzle significantly different, thus you can easily distinguish between the two, to determine whether the aircraft had been fitted on the WS - 10.
This is the WS - 10 engine nozzles
This is the AL - 31 engine nozzles
This is the WS - 10 engine nozzles
This is the AL - 31 engine nozzles
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