Should "pacinolove" and others be too afraid to ask as a result of our answers ?
Very obviously, he is just looking unpretentiously for answers to some questions he has.
Wether he SHOULD have KNOWN, OR NOT, may have numerous reasons.
To assume the worst, as some 'aces' (also in respose to his other questions in other topics) do, is at least impolite.
If he puts these questions in his early days on the Airbus as a 'learner', there is no good reason to 'hammer him down'.
Know how some type qualification training is done nowadays...?