What is the maximum deviation permitted in a compensated magnetic direction indicator during level flight?

In aviation, the maximum deviation allowed in a compensated magnetic direction indicator during level flight is important for ensuring that pilots can accurately determine their heading. The correct answer indicates that a maximum deviation of 10° is permissible. This standard helps maintain safety and operational integrity by ensuring that aircraft navigation systems are reliable and can effectively guide pilots during flight.

A 10° maximum deviation allows for some variability caused by magnetic interference and errors that can arise due to the aircraft's design, materials, and nearby electronic systems. Exceeding this limit could lead to significant navigational errors, which is why a deviation this small is mandated.

The other options suggest higher limits which would not be acceptable for safe flight operations. A smaller deviation indicates better calibration and reliability of the magnetic direction indicator, which is crucial for precise navigation. Knowing this maximum tolerance is essential for pilots to ensure their instruments are functioning correctly and to make necessary adjustments as needed during flight.