To read it on the iPad, first buy "Good Reader". Seriously, don't cheap out here, you'll love if for all the other PDFs you have. (pilots guides, VFG, etc.)
Then go to that CASA web page and tap on the PDF to view it in Safari.
After it loads, tap "Open in Good Reader". It will be saved in Good Reader for easy reading.
That said: WHO THE HELL THINKS THAT CREATING A MAGAZINE LIKE YOU ALWAYS HAVE AND THEN POSTING A HUGE PDF ON THE WEB INSTEAD OF SENDING IT TO YOUR PRINTER IS A GOOD WAY TO MAKE AN ELECTRONIC VERSION OF A MAGAZINE???
Seriously: what's wrong with a normal website? Install WordPress, buy one of the many "magazine" layouts for it and start publishing as and when you have stories instead of the bi-monthly drop.