TSM, I used the word, "appropriate" because it is the case that when we check for leaks from fuel pipes we do it in an appropriate manner. I don't doubt that BA uses the methods, described by Winco, to check fuel pipes and we would do something similar when required. But, importantly, the pipes we are discussing in this side topic are vent pipes, not fuel pipes.
Winco, can you ask your colleagues at BA if they routinely check the fuel tank vent pipes for leaks? I would guess that they do not do so. And, if I'm right with my guess, that would place the Nimrod fleet in better light than our national carrier, regardless of how we do the tests......Winco? Over to you.....