What is the first action taken during post-flight procedures?

The first action taken during post-flight procedures is indeed taxing on the aerodrome surface. After landing, the aircraft must be safely maneuvered along the taxiways to reach the gate or designated parking area. This step is crucial as it ensures that the aircraft transitions smoothly from the runway to the terminal area, allowing for proper clearance from the runway and avoiding any conflicts with other vehicles or aircraft.

Once the aircraft has safely parked at the gate, crew members can then proceed with other post-flight activities such as shutting down the engines, conducting a walk-around inspection, and preparing for the next flight. Each step is part of a structured process that prioritizes safety and efficiency, where proper taxiing is the initial phase that sets the stage for the subsequent actions.

Thinking about the other choices: entering the VFR pattern refers to operations associated with arriving or departing from an airport under Visual Flight Rules, which does not pertain to post-flight procedures. Standing after arriving at the gate describes a later part of the post-flight sequence after taxiing. Emergency landing checks are procedures that would be taken only in a critical situation during flight, not in post-flight operations.