MiG-21Bis Compressor Surge performing warning lights check.

[Fishbed-21]

Hi,

as said in the title, perfoming a warning lights check (using the knob on the left side of the cockpit, the one which display landing gear and flaps status) cause a total extension of the nose cone and a subsequent compressor stall.

The video show the start-up and the explained bug.

During the video you should check the nose cone movement indicator and the engine rpm gauge.

Thanks for all answer!:thumbup:

MiG-21BisCompressorSurge.trk

[BravoYankee4]

I noticed that as well. But it isn't for all warning light check buttons - just this one if I remember correct.

[Toybasher]

Maybe intended behavior? I swore this was mentioned in the manual. (maybe it was Chuck's MiG-21 guide.)

[grunf]

Maybe intended behavior? I swore this was mentioned in the manual. (maybe it was Chuck's MiG-21 guide.)

You're right, it's in the manual, page 59:

 

Precautions: The Nosecone won’t operate if landing gear are extended: the pilot can check its

functionality while on the ground with extracted gears by pressing and holding button LV50 for a few

To table of contents 60

seconds. By doing so, the nosecone will start to move. This operation should be kept very short, as it

could cause engine surge if prolonged. After takeoff and gear retraction, the pilot should pay

attention that the nosecone is extending.

[Fishbed-21]

You're right, it's in the manual, page 59:

Ah ok perfect, i thought it was a bug cause using the other warning lights knob (the one rear the stick and the one on the right side) the nosecone didnt extend