Sukhoi Su-27 variant
Sukhoi Su-27 Su-27UBM2
Su-27UBM2 is the designation given to the Kazakh Air Force's two-seat Su-27UB combat trainers after they passed through the modernisation programme contracted with Belarus. The work was carried out neither in Russia nor in Kazakhstan, but at the 558th Aircraft Repair Plant (558 ARZ) in Baranavichy, the Belarusian facility that through the 2000s specialised in bringing Soviet-built equipment up to date for customers across the Commonwealth of Independent States. The contract was signed in 2007 and covered ten aircraft. The first modernised fighters were handed back to Kazakhstan in December 2009 and went to the 604th air base at Taldykorgan, equipping the squadron known as "Barsy Zhetysu" (the "leopards of Zhetysu"). At that point Kazakh aviation operated some thirty-odd Su-27S and Su-27UB airframes, and it was not settled whether the whole fleet would follow. The Su-27UBM2 keeps the airframe, powerplant and tandem two-seat layout of the Su-27UB: it is not a new aircraft but a refurbished airframe with extended service life and an added equipment package. The designation appears in Kazakh registration records — for instance the aircraft carrying board number 52, serial 96310415083 — confirming that it is not a purely journalistic label but a name applied to specific aircraft in service. It should not be confused with the Russian Su-27SM modernisation family, nor with the newly built derivatives (Su-30, Su-35): this is a fleet upgrade programme, limited in scope and with a single customer.
History
Origin of the programme
After the break-up of the Soviet Union, Kazakhstan inherited a batch of Su-27s without the industry needed to keep them current. The 558th plant at Baranavichy, in Belarus, filled that gap: depot-level repair, service-life extension and the addition of modern equipment to Soviet airframes. The 2007 Kazakh-Belarusian contract tasked that plant with modernising ten aircraft.
Deliveries and receiving unit
The first modernised aircraft returned to Kazakhstan in December 2009. They joined the 604th air base at Taldykorgan, with the "Barsy Zhetysu" squadron. The Kazakh Su-27S and Su-27UB fleet then numbered around thirty-five aircraft, with no announcement as to whether all of them would undergo the same process.
Relationship with the Su-27M2
Kazakh single-seaters put through the same programme received the Su-27M2 designation, while the two-seat Su-27UB became the Su-27UBM2. Both designations therefore belong to the same contract and the same plant, differing only in the baseline aircraft.
Documentary gaps
Detailed descriptions of the equipment package (radar, electronic warfare, targeting pods, precision weapons) circulate mainly in forums and press notes without a verifiable primary source, and are therefore not reproduced here. Nor is there public confirmation of how many aircraft were finally modernised beyond the ten of the original contract.