water tank thing was added as it was part of the challenge
food water parts mechanics navigation. I doubt UV light will purify water in a tank.
-was the water drinkable in say cairo airport or basra in early 50s?
-why did planes have 4 crew: pilot co pilot radio officer navigation officer
-were the radio officer and nav officer qualified to fly?
-----------
off topic but a favorite place
http://w1.901.telia.com/%7Eu90121659..._final_SBH.jpg