You must have at least the following flying experience before you will undergo CU
training:
• 2900 hrs total time
• 1500 hrs on JAR 25 type aircraft
• 500 hrs on B737-800 in Ryanair
In addition you must have been deemed suitable following an interview with Flight
Operations management and Personnel.
Straight from our CU guide. I also remember reading somewhere that you must have completed one full winter and performed well in your previous 2 sims.
Edited to add: and completed the FR route to command (RTC) course, basically a mini ATPL theory course on all our operations/flight manuals. Not a bad thing really but can be intense if you leave it all to the last minute.