mig21 engine airflow picture. explanation what some switches do on the fuselage. anti-surge doors etc... i had some trouble finding out what the derumble doors are. also called anti shutter doors,  anti-surge doors. couldn't figure out what the nozzle 2 position was too.<br /> after searching i found what these witches externally do on the fuselage.  i made a picture with the explanations written on the picture. they all have to do with the engine airflow and engine and emergency settings ...
Datum: 03/15/2019

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