When arriving at the airport and returning it as it is, what kind of flow should I do cockpit preparation after doing shutdown checklist? Is it flow to check items other than first flight of the day?
I think it would be wise to indeed check everything but you don't have to set it up all over again. Of course this depends on how you left the plane. If you really turned everything off to cold and dark (so if you also turned off MAIN BUS TIE, RECIRC, EMER LIGHTS, POSN, FMS, ARCDU, external power, displays) well, then you obviously have to do everything as if it is the first flight of the day (apart from the tests, I guess), but if you left these things on you are in a boarding state and you will only have to check those items.
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I think it would be wise to indeed check everything but you don't have to set it up all over again. Of course this depends on how you left the plane.
If you really turned everything off to cold and dark (so if you also turned off MAIN BUS TIE, RECIRC, EMER LIGHTS, POSN, FMS, ARCDU, external power, displays) well, then you obviously have to do everything as if it is the first flight of the day (apart from the tests, I guess), but if you left these things on you are in a boarding state and you will only have to check those items.