"The Syrian Air Force has suffered major losses in the last year, as the aircraft and helicopters were unleashed on rebels (and civilian supporters) and took a beating. Of the 370 usable fixed wing war planes the Syrian Air Force had two years ago, about half are now out of action because of combat losses or wear and tear. Nearly two-thirds of the 360 helicopters are gone, for the same reasons.
Part of the problem was that few Syrian air force leaders (and pilots) were prepared for this kind of war (low level bombing and lots of helicopter flights under fire). Desperate time remand desperate measures, and in the last few months even the MiG-29 fighters have been seen dropping bombs. These are the most modern aircraft Syria has and their pilots were trained to fight Israeli jets, not bomb civilians. But a village or city neighborhood is hard to miss, even for a rookie.
A more costly problem is the lack of flying time in the last decade. Syria could never afford, even with Iranian subsidies, to let their combat pilots fly enough to be really good at it. For the last year, the only flying has been for combat missions. MiG-29 pilots were taught about bombing, if they had no experience in that, on the ground and practiced the weapons release procedure while the aircraft were sitting on the ground. The first actual bomb drop was for real, not practice. This lack of flight time led to operational losses, especially when it came to landing damaged (by enemy action or equipment failure) aircraft. This often led to aircraft loss rather than bringing home a repairable aircraft. A shortage of spare parts often made repairs impossible and has become a major factor in aircraft becoming inoperable after heavy use (which wears out some components).
The Syrian Air Force also suffers from an overabundance of older, well-worn, and poorly maintained aircraft. The best example is their use of the MiG-21. This is a 1950s design and most of the few remaining current users are phasing them out. But because Syria is so poor, their 150 MiG-21s are still the most abundant aircraft in their air force. But only about half of these MiG-21s are flyable. There are also a hundred 1960s era MiG-23s, ten MiG-25s, and 40 MiG-29s. There are also 20 Su-24 and 60 Su-22 ground attack aircraft. The 60 operational L-39 jet trainers were also able to carry some weapons (typical with trainers like this) and were used to attack rebels. There is also a large force of helicopters, the most common being over 240 Mi-8s (including some of the more modern Mi-17 model). There are 120 attack helicopters, half of them Mi-24s (a gunship variant of the Mi-8 and contemporary of the American AH-1), the rest are elderly French Gazelle scout helicopters and Polish Mi-2s. These are mostly used as aerial taxis as they only carry a few weapons and can’t handle much damage."
http://www.strategypage.com/htmw/htatrit/articles/20130618.aspx
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