EASA NAV(A)intermediate
Explain why an electronic device might affect a direct-reading compass but not necessarily an airspeed indicator.
Answer
A direct-reading compass responds to magnetic fields, and electronic devices or currents can produce fields that disturb its indication. An airspeed indicator measures pressure differences rather than magnetic direction.
Explanation
A magnetic compass aligns with Earth's magnetic field, so nearby electrical currents or magnetic components can bias its indication. An airspeed indicator instead responds to pressure from the pitot-static system. **Key takeaway:** Instrument susceptibility depends on the physical quantity being measured. **Glossary:** **Magnetic field**: A region in which magnetic forces act; **pitot-static system**: Pressure sources used by flight instruments.
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