EASA NAV(A)intermediate
Place the steps in order to show how magnetic drift leads to a runway being renumbered.
Answer
Earth's magnetic field shifts local magnetic variation, The runway's magnetic heading changes relative to its true heading, The magnetic heading rounds to a different ten-degree increment, A new runway number is officially designated and repainted
Explanation
Variation links true and magnetic direction. If variation changes, the runway's magnetic bearing can change; if rounding then produces a different ten-degree value, its designation may be revised. **Key takeaway:** Runway-number changes can result from magnetic-reference changes rather than construction. **Glossary:** **Variation**: Angle between true and magnetic north; **designation**: The runway's numbered identifier.
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