I believe you should stick to that if it is true. But even if I`ve never seen a SM, SMT, ST nor BIS aircraft “passports”, I`ve seen plenty of Mig-21PF, PFM, M, MF, R, US, UM. I doubt the passport of Iraqi Mig-21 in Yugoslavia said anything similar like SM. See following pics, taken from various Mig-21 passports, usually there is written a code, the “izdelie” of aircraft and engine or an aircraft construction/engine number. Never a commercial name, like PFM, M, MF, R, UM….etc
Could be also surely wrong, bcs Migs-21SM/MF were equiped with R-13-300, whereas the Mig-21SMT the predecessor of Mig-21ST with the modified R-13F-300 engine. You mentioned that before, Iraqi Migs-21 were some kind of BA$TARDS, smaller intake(maybe SM/MF sized??), engine R-13-300 from older SM models, the SMT sized spine(fuel tank), additional turbo cooler for avionics/engine, modified avionics like the added RSBN antenna on a/c intake and some other changes…
I have a theory but you wont like it. 🙂 Those Iraqi Migs-21 in Yugoslavia were partly worn-out SM models from Soviet regiments, then overhauled, modified and then sold to Iraq. How typical for that times and Soviets dealing with non-trustworthy Arab countries
martinez!
Iraqi MiG-21s have bigger – bis size – air-intake, with bis-form nose-ring.
> The airframe is 21bis.
The airfame is more important, than the engine.
I have photos of 515.iap. MiG-21SM – with smaller intake – with R25 engine.
Also, there were many MiG-21bis with R13-300 engine at Kusovskoye training regiment in SSSR.
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