Down to the individual crew, surely? Having seen thousands of bad weather situations in the London TMA I'd suspect that nothing concrete is written down. One crew will go straight through a storm cell without batting an eyelid and another crew behind - same type, same company - will divert round half of southern England. I kid you not!
Same when I was a tower controller at Heathrow - some guys wouldn't think of taking off if there was a cell nearby... they just sat there whilst others did. Some would request turns off the SID; others wouldn't.. It's all Black Magic!
Last edited by HEATHROW DIRECTOR; 17th December 2004 at 12:47.