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Just remember that the flows are a guide, and things won't always go in the way they are presented.
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What does that mean? Does everyone do their own version of the flows and profiles, or what?
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No. We have a "receiving flow" which as in the book is for first flight only. When doing it non-first flight or as a through stop, you only test and check a few of the items that are in that flow. Something you won't probably see until late in sims or until you're on the line.
In the "power-up" flow, it has you check the fire detection systems first. But, that's only done as a first flight item, not every time you start the APU. It's also in the captain's receving flow. Now, for the captain, if the fire detect system has been checked in the power-up, there is no need to check it. Paricularly for the fact that if the test button is held for more than 15 seconds, the APU will power down.
That's the kind of things I meant. A lot of people get hung up on the flows and bent out of shape if something happens out of order. I mean they are a guide to get things done correctly and expeditiously, but the checklist is the final determinant to ensure it was accomplished.