When I used to do Airport Security in Aus we did screen all crew bags etc, but were told it was just a formality and nothing more. Under no circumstances we were to question pilots belongings. Of course a gun would have done more than raise a few eyebrows but the chances of that happening werent that great.
Tools and small leatherman type knives are common in pilot nav bags and are also very handy.
[ 16 September 2001: Message edited by: Right Seat ]