Where is the AOC number typically displayed?

• A. On the tail of the aircraft.
• B. On the left side of the cockpit window or near the door.
• C. On the nose gear.
• D. On the top of the fuselage.

Answer: (B)

An AOC number identifies the operator’s regulatory approval and must be visible from outside the aircraft. It’s placed on the left side of the fuselage near the cockpit window or close to the door so it can be read easily by inspectors and authorities during ground checks and inspections. This location keeps the mark in a consistent, widely visible spot that’s practical for crew and regulators.

Other locations aren’t standard for this purpose. The tail usually carries registration marks or logos, not the AOC number; the nose gear isn’t a practical or readable spot; and the top of the fuselage isn’t a commonly used location for operator certification marks.