The red and green line map provided by fawad is almost correct.the only correction to be made is that that green line s left turn should have been a bit wider.A fokker would land comfortably using the green line map but airbus,777 and 747 make a wider circle.
There are no anti aircraft guns near margalla hill.
kahuta has live missiles but is about 30 miles away from margalla hills .Kahuta is approx in opposit direction of the final flight path.
The air blue jets first attempt was on runway 30,second was for12 ,this i saw myself when it passed very low over my home.it turned around flew back towards islamabad-margalla hills and crashed.
I am sure the pilots were flying very correctly.when ever a plane misses landing on 12 it flies directly over my home otherwise normal landings can be seen from my window.
Another points ,when it passing over head the engine power was increasing and the gears were in up position...both normal i think,because the plane was very low.