During a typical trans-atlantic flight, can anyone list communication between flight crew and cabin crew?
I am interested in "mandatory", i.e. safety-relevant communication between the flight deck and the cabin, such as the before take-off and before landing notifications from the flight deck to the cabin crew.
What information must be communicated (by law) according to, e.g., ICAO or a major country jurisdiction?
Let's exclude any information regarding passengers, pax health issues, operational delays, meals, anything that is not directly safety relevant.