Es werden
NUR Träger und Schlösser aufgeführt, nicht mehr, nicht weniger ...
Unter N° 5 "
спец. изделие" (Spezial-Erzeugnis) wir nur der bekannte Unterrumpfträger BDZ-66-21N gelistet
siehe dazu auch nochmal die beiden letzten Fotos ==>
Миг-21Бис в экспозиции совсем не бис! - Страница 3 - Форум
Träger und Bedienpult für das "
Spezial-Erzeugnis" ....
In fact, according to my contact who served as a Hungarian Airplane Supply Center officer at this time, not all Hungarian planes keep their original inventory books during their lifetime. Some cases every main part (fuselage, engine, fuel system, weapon systems etc..) have their original small logbooks (In Russian "Формуляр") and the Airplane Supply Center create a new Hungarian language inventory book. That practice is common at late 70's 80's when we have established an authorized aircraft repair center called "PG - Pestvidéki Gépgyár Szigethalom" where all of our MiG-21Bis's repaired.
Every Hungarian plane that sent to this factory for required inspection or repair changed their Russian language documentation to a Hungarian one. The mentioned Nr.3547 plane Russian language inventory book should remain in service because the plane was destroyed in 1989 by an air crash that prevents to change their documentation.
The reason why only the pylon listed under special weapons are should be simple. Inventory books usually have a separated sections for electric, engine, weapon systems. Some cases this equipment have belonged different departments. (That is valid for Russian and Hungary, but I don't know how this worked exactly in other Warsaw Pact country.)
For example, airplane radios, RSBN equipment, SRZO, SPO, SOD belong the Signal and communication departments
Guns, ejection seat pyro cartridges belong the regular weapon department
Pylons their equipment, UB blocks etc. belongs the airplane weapon department
Fuels and equipment belong the fuel department
Missiles, rockets, ammunition belong ammunition department
Drag chute, KM-1 ejection seat chute, and harness belong the chute department
I suspect Russians keep this separation in relation to special equipment too.
By the way, I own the plane 3547 ejection seat and other small parts and working to find additional information or documentation about this plane nuclear capability.