Foolish priorities.
The Iranian government would be better advised to invest some of its loot in a decent aviation safety culture for the state airline, instead of unnecessary nuclear power/weapons development. The above contributors make it abundantly clear that the airline is incompetently and dangerously run.
I also feel for the pilots who have to work in the environment described so articulately above. Iran is a hostile country both in terms of weather and terrain. The pilots need all the technology and training support they can get.
There is no excuse for poor nav systems on a 727, with GPS readily available. And aircraft parts can be sourced throughout the Middle East, as well as decent maintenance. No excuses on the sanctions front. The country is wealthy enough, but chooses to spend its money on other things. Dare I say Iran has something of a medieval outlook on its expenditure?