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D3-57D release unit. Before loading an external stores,must be this device mechanicaly locked-up by special key.

This system (circuit)is primary designate for preserving transverse (yaw) stability of A/C.

Yes a little bit + 10 yars of maintenance on 21MF.

Hi all, A few words about bomb release modes. MAIN -TACTICAL RELEASE- by button WEAPON RELEASE,all bombs are dropped in ARMED status.(always) EMERGENCY-by two buttons EMERGENCY RELEASE INNER and OUTER. There is a choice between ARMED or UNARMED by switch TACTICAL RELEASE.Red light is ON or OFF. EMERGENCY with no pilot input(no release button).This is fully auto-release . In case that load is dropped(electrical or mechanical failure),automaticaly is released load from second pylon in pair(1-2 or 3-4). This el. circuit is powered stright from EMER.RELEASE in breakers section. Very quickly for start,I will by proceed tomorow.

Yes,this is non standart,unusual but not impossible.For training flight with bombing task,exist such mechanical thingy which can imitate second bomb in pair(1-2 or 3-4). Just now I have not much free time,but I try to explain something about bombing system as soon as possible.

Yes,you are right.

This is russian terminology-vneschnyi-external -vnutrennyi-internal So, it does not mean,that optical rangefinder is out of board of a/c. Or,you can try to ask somebody on russian forum for exactly explanation.

At second. External-base optical range-finder or -vneschne-bazovoy optitcheskoy dalnomer-. When we have exactly set wingspan(on inner scale) and exactly framed target by rotation grip (MANUAL mode) we can read range on 400-2000 range scale. When a piper is off from some reason,we can read range on fix net.

DV-30 and ZDV-30 do not belong to ASP set.DV-30 has only to provide baro- pressure for altitude computation unit which is a part of analog. computer. This unit(in ASP comp) has to convert physical pressure to electrical signal. ZDV-30 (potentiometr) can correct this signal. By this input we can fix a difference between baro-altitude of ground target and take-off airfield. This system is used only in GROUND mode.

Probably is located in forward avionics bay.Altitude correction was adjusted before flight by ground personel,or by pilot.

Altitude input is from DV-30 unit,which is connected to static pressure system and pitch angle(epsilon) input is from AGD-1. The DV-30 has el.correction unit ZDV-30,but I do not know, where is on BIS variant.On MF variant is located in cockpit.