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A pilot in an aircraft on the ground is paying attention to their DRMC when they make a turn in a left direction and see a decrease in the value of the DRMC, which (1) _____. Then when the aircraft is aligned with runway 270 his DRMC reads 290, indicating that the (2) _____.

  • A

    (1) is usual; (2) the DRMC is serviceable.

  • B

    (1) is usual; (2) the DRMC is unserviceable.

  • C

    (1) is unusual; (2) the DRMC is serviceable.

  • D

    (1) is very unusual; (2) the DRMC is unserviceable.

When turning left, the aircraft's heading decreases. If the DRMC is functioning correctly, a left turn should result in a lower heading value. Therefore, a decrease in the DRMC reading during a left turn is normal.

If the aircraft is aligned with Runway 27, the direction indicator should ideally read 270°. A reading of 290° when aligned with Runway 27 indicates a 20 degree discrepancy.

According to CS 25, the magnetic direction indicator required by CS 25.1303(a)(3) must not deviate by more than 10 degrees on any heading in normal level flight after compensation. Consequently, RW 27 could have a track between 265 and 275 degrees.

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