Which aircraft door does the code R1 represent?

The code R1 specifically refers to the Forward Service Door located on the aircraft's right side. In aviation, door designations utilize a standard labeling system where "F" typically stands for "Forward" and "A" for "Aft," while "L" and "R" denote the left and right sides of the aircraft, respectively.

In this context, the Forward Service Door is primarily used for boarding and deplaning passengers and is essential for ground services. Recognizing door codes is crucial for understanding aircraft operations, emergency procedures, and service considerations. The forward position of R1 compared to any aft doors provides clarity in identifying the main passenger access point on the right side of the aircraft.