Station numbering means

• A. A specific measured distance from the datum to a point in or on the aircraft
• B. A serial number of the component
• C. The electrical circuit's breaker number
• D. The page number in the drawings

Answer: (A)

Station numbering locates features along the aircraft’s length by measuring a distance from a fixed reference point, called the datum. The datum is a chosen reference along the centerline, and each station represents a specific distance from that point, typically along the longitudinal axis. This system lets engineers and technicians identify exact locations on the airframe for assembly, inspection, and maintenance. For example, a feature at station 35 is 35 units (inches or millimeters) aft of the datum. This is different from a component’s serial number, an electrical breaker number, or a drawing page number, which do not specify a location on the aircraft.