Airplanes may turn lights off during landing to improve visibility for both pilots and ground controllers.
Enhanced Visibility During Landing
Turning off some lights on the aircraft can help improve visibility for pilots and controllers, as stated in the reference: "Both pilots and controllers on the ground need to be able to see the aircraft clearly to ensure it is on the correct path and that there are no obstructions on the runway. Blanking out light sources on the aircraft can help improve visibility for pilots and controllers." This enhanced visibility is crucial for ensuring the aircraft is on the correct path and that there are no obstructions on the runway.
Specific Reasons for Dimming/Turning Off Lights:
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Improved Night Vision: Reducing the amount of light inside and outside the aircraft allows the eyes of pilots and air traffic controllers to adjust to the darkness, improving their ability to see other aircraft, runway lights, and potential hazards.
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Reduced Glare: Bright lights inside the cockpit can create glare on the windshield, making it difficult for pilots to see outside. Dimming or turning off these lights reduces glare and improves visibility.
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Emergency Preparedness: In rare cases, dimming the cabin lights during landing is a safety precaution taken to prepare passengers' eyes for a potential emergency evacuation in low-light conditions. This measure is preventative and aims to improve passengers' vision if they need to evacuate the aircraft quickly in darkness.
