Which waypoint is not part of the Site X departure sequence?

• A. Langley
• B. Tree Field
• C. Snake
• D. Fog

Answer: (A)

A Site X departure defines a fixed path with specific waypoints that you fly in sequence to transition from the airfield to the en route structure. The chart for this departure shows the route passing through waypoints that are published for this SID, and those fixes are the ones you follow after takeoff.

In this scenario, Tree Field, Snake, and Fog are the fixes that appear on the Site X departure as part of its published sequence. Langley, however, is not listed as part of that departure’s path. It isn’t referenced on the Site X chart as a waypoint along the route, so it isn’t part of the official SID you’re expected to fly. That’s why Langley is the correct choice for the waypoint not included in the Site X departure sequence.

If your flight plan or routing includes Langley, you’d be navigating to or from a different segment or procedure outside the Site X departure path.