Same as anywhere else depends who is on. If you don't have some form of airport pass you might have issues. The type or level of pass doesn't actually seem to matter just that you have one.
Its not unkown for some private crews to get an official looking crew card made up which airport security seem happy with even though the card makes no pretence at all at being a security airport pass and just states they are a pilot with a photo. Remember to put a return address on the back and have a magnetc strip.