EASA NAV(A)intermediate
Why might an aerodrome change a runway designation from 06 to 07?
Answer
Magnetic variation at the runway changed
Explanation
Runway numbers approximate the runway's magnetic direction in tens of degrees. A change in magnetic variation can alter the magnetic bearing enough to require a new rounded designation, without any physical runway movement. **Key takeaway:** Runway designation is tied to magnetic direction. **Glossary:** **Runway designation**: The numbered label approximating runway magnetic direction; **variation**: True-to-magnetic angular difference.
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