The FDP CMD does not show your times with an automatic extension before being extended. Our website also tracks 117 for us. You should keep doing your own calculations but to say you are on your own is really false. You have an amazing amount of resources at you finger tips including the people who are tracking your situation from a computer when your times go critical. You can also call or msg them anytime in advance and they will look at your situation with you.
117 is about fatigue and rest rules, not work rules. If you figure that out and it will be obvious you need to call in unless we negotiate something into our PPM.