Hi
Yes you will need to get the crew approved by homeland security and then fill in the apss form on the internet.
Have you got FAA approval to operate the 146 with the crew access door open and available to the rear crews?? From what I remember from an interview I had there not so long ago the rear techies and crew attendants had access to the cockpit.
Will try to get some contact numbers for you as I'm back in the office tomorrow.
VEEPS