Actually the explanation about the chart index number is inaccurate. First 1 is for the airfield number in the same city and is allocated arbitrarily, second 1 is for ILS and if it was 3, would have been VOR procedure, 6 NDB and so on (usually higher numbers means less precision). The -1 is for the runway and if there are 2 or 3 or many identical procedure for the same runway they add A, B after they let one procedure without a letter. Example: Let's say that in Bucharest are 2 aeroports and we decided to land at the second one, on runway 25 wich has 2 ILS procedures. The index numbers for each chart will be 21-1 and 21-1A.
Question. at 4:25 it is defining MSA. it says when coming from East we can descend down to 2600. i think it's wrong? shouldn't it be when coming from East, my heading will be 270° , so my MSA then is 3700' and not 2600' ? please explain. thanks