hi the reason that you can't see all the DAP on some aircraft is that some of them have not been wired up to downlink all of the parameters. EG BA Gatwick jets are on a maintenance program to have all the parameters downlinked as they go for major maintenance. Eventually they will all show all DAPS it is just the maintenance schedules. if you see some that don't downlink, go to your safety department and get them to talk to the airline - they will need the flt number and date etc so that they can advise the airline that a specific airframe is not yet wired up
