Instrument Rating Checkride Practice Test

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What visibility is required for part 121 operations with aircraft that have 3 or more engines?

  1. 1 mile visibility

  2. 3/4 mile visibility

  3. 1/2 mile visibility

  4. No visibility requirement

The correct answer is: 1/2 mile visibility

The visibility requirement for part 121 operations with aircraft that have three or more engines is established to ensure safe takeoff and landing under instrument flight rules (IFR). Specifically, the regulation mandates a minimum visibility of 1/2 mile. This lower visibility requirement reflects the operational capabilities of multi-engine aircraft, which are designed to perform well in a variety of conditions and can safely operate when visibility is reduced compared to single-engine aircraft. In the context of part 121, these aircraft benefit from their enhanced performance, allowing them to achieve this lower visibility threshold without compromising safety. This helps facilitate operations at airports that may experience varied weather conditions, thus improving overall efficiency for commercial flights.

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