What does the code R2 denote in terms of aircraft doors?

The correct option, which is B, identifies the code R2 as designating the Aft Service Door on the right side of the aircraft. In aviation terminology, door codes typically consist of a letter indicating the side and a number indicating the position of the door relative to the front of the aircraft. "R" signifies the right side, while "2" indicates that it is the second door towards the rear (aft) of the aircraft.

Understanding these codes is crucial for efficient operations and emergency procedures in aviation. The aft service doors are essential for boarding, deplaning, and servicing the aircraft, which underscores their importance in both routine operations and emergency evacuations. This code system helps crew members quickly identify which doors to use in various scenarios.

The other options refer to doors on the left side of the aircraft or indicate incorrect positions or functions, which do not align with standard aviation door codes. Hence, option B accurately reflects the meaning of R2 in the context of aircraft doors.