744 Freighter Main Deck Fire Suppression

[Jon Lei]

Hi all, just wondering..

1) Can the main deck depressurise on the 744F without the upper deck depressurising ( with the staircase fire resistant door shut) during a fire sw activation?

2) Simmilary, is it possible for the flight deck, equipped with a bullet proof door with no blow out panels, to remain pressurised in an event of a cabin decompression on the 744 pax version?

3) How many O2 bottles does the 744F have for the cockpit crew and upper deck occupants respectively?

4) Why does the 744F MTOW decrease when the fuel density is below 0.78?

5) Why does the 744F MTOW decrease when the ZFW increases beyond 276T?

Thank you in advance. Cheers.
JL