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Shortly before take-off, and again before landing, the cockpit (no way to tell whether it was the Captain or First Officer) came on over the speakers, stating:

Flight Attendant's, prepare for take-off/landing and cross-check

What is a cross-check?

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I've only heard this (outside the cockpit, instrument cross-checks happen all the time) as part of "arm slides and cross check", same thing? –  falstro Jun 19 at 15:58
    
@falstro I would assume so -- "Doors locked, slides armed" seems like the most obvious thing that Flight Attendants would need to cross-check. –  voretaq7 Jun 19 at 16:59

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up vote 15 down vote accepted

This website has the definition:

Crosscheck is a generic term used by pilots and flight attendants meaning that one person has verified the task of another. In the cabin, flight attendants crosscheck one another’s stations to make sure the doors are armed or disarmed as necessary.

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Obviously they don't want to unduly alarm (already nervous enough) passengers by talking about arming things and slides and locking/securing doors, so the command is given without specifying what is being crosschecked (or maybe just "doors"). The cabin crew knows what they're supposed to do, and whose work to (cross) check for completion. –  Phil Perry Jun 19 at 18:49
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If you watch the cabin crew after this announcement is made, you'll see them do stuff with the doors and then peer across the cabin to check that the crew member at the opposite door has done their thing correctly. –  David Richerby Jun 19 at 19:01
    
@PhilPerry On most of the flights I've been on, they've used the same formula: "Cabin crew doors flight position and cross-check, please." –  Angew Jun 19 at 20:53

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