During daytime CBM operations, which statement about lights is correct?

• A. All exterior lights off during the day
• B. Taxi lights off, landing lights may be on
• C. Landing lights on
• D. Landing and taxi lights off until lineup

Answer: (D)

During daytime CBM operations, exterior lighting is kept off until just before you enter the runway for takeoff. This minimizes distraction and power use while you’re taxiing and approaching, and ensures lights serve their safety purpose at the critical moment of lineup. Turning on both landing and taxi lights only as you prepare to lineup makes you more conspicuous to ground personnel and other traffic without causing unnecessary glare earlier. Other options would require lights to be on when they aren’t needed or would turn on only one type of light in daylight, which isn’t the standard practice for daytime operations.