What is the announcement made to indicate it is safe to open the Main Cabin Door (MCD)?

The announcement made to indicate it is safe to open the Main Cabin Door (MCD) is clearly signified by instructing the flight attendants that it is time for arrival. This announcement communicates to the cabin crew that they can proceed with the necessary procedures related to the arrival of the aircraft, which includes opening the doors for passengers to disembark.

The phrasing used in this announcement is essential as it reflects the standard operating procedure to ensure safety. It indicates that the aircraft has reached a complete stop, and all systems are secure for passenger egress. Thus, it confirms that the operation and preparations for disembarking the passengers can begin.

It is important to understand that other phrases, while relevant in different contexts of flight operations, do not specifically denote the safety of opening the doors for disembarkation. Each of those communications serves distinct purposes throughout the flight process, but only the announcement indicating arrival is directly related to the opening of the Main Cabin Door.