What does the No3 check at row R-MED?

The No3 check at row R-MED is focused on ensuring the safety and readiness of the aircraft in specific areas, including assigned door checks and area checks. This check is critical as it involves verifying that all emergency exits and access points are functional and free from obstructions, which is essential for passenger safety during both normal operation and emergencies.

During this check, cabin crew conduct thorough assessments of the surrounding area to confirm that all emergency equipment is in place and operational. This aligns with standard safety protocols that prioritize the readiness of evacuation routes and emergency equipment, thus supporting an efficient response if evacuation becomes necessary.

The options that involve checks on the water and waste systems, evacuation procedures, or the transmission of announcements do not directly pertain to the specific duties outlined in the No3 check at row R-MED, which is primarily concerned with monitoring the physical safety features and emergency access points in the cabin area.