![]() ![]() Pressurization only works when the cabin remains airtight. With the help of bleed air from the engines, the cabin becomes pressurized to keep the oxygen levels and temperatures stable. To maintain a safe environment, airplanes have special pressurization systems. The temperature also drops to about -60-degrees Fahrenheit. When the plane reaches the stratosphere at 35,000 feet, the air pressure is less than a quarter of its value compared to the air pressure at sea level. When a plane reaches 10,000 feet or higher, the air becomes significantly thinner. Keeping the shades closed inflight allows passengers to continue resting.Ĭommercial aircraft typically cruise at an altitude of 35,000 feet. If traveling west, the sun may be out when the plane lands. For example, a plane may start in a time zone where the sun has already set. When traveling great distances, the plane may travel across multiple time zones. The reason that the crew encourages passengers to close the shades is to allow other passengers to rest on long flights. However, this is a recommendation and not a requirement. On a long flight, the crew often asks passengers to close their window shades. Do You Need to Close the Window Shades on Long Flights? By turning off the lights in the cockpit, the pilots’ eyes gradually adapt to the dark, allowing them to see their surroundings and safely maneuver the plane on the runway and taxiway. Landing in the dark requires pilots to see runway signs and paths more clearly. Turning off the lights allows the eyes to adjust to the lighting outside.ĭimming or turning off the lights also aids the pilots. Why Do Planes Turn the Lights Off When Landing?Īirlines require pilots to dim or turn off the lights during takeoff and landing for the same reasons that the shades need to be open. By opening the shades during takeoffs and landings, it may be easier for individuals to safely exit the plane. Without adapting to outdoor conditions, they may not be fully aware of their surroundings. If an emergency occurs on the runway, passengers and crew may need to immediately evacuate the plane. After exposure to bright outdoor sunlight, it may take up to a half an hour to adjust to dim indoor lighting. It takes a moment for the eyes to adjust. Unfortunately, the pupils do not always adapt quickly to changes in lighting. When a person is in a bright environment, their pupils grow smaller to block additional light. When a person is in a dark environment, their pupils widen to let in additional light. The irises and pupils of the eyes adjust based on exposure to light. Opening shades helps the eyes adjust to the outdoor lighting conditions. Why Do Airlines Open the Shades During Takeoff and Landing? During an emergency, passengers and crew will already be acclimated to the light or dark outside. Takeoff and landing are when accidents are most likely to occur. TLDR – The shades or blinds need to be open during takeoff and landing to help passengers and crew adjust to the lighting outside. Do More Accidents Occur During Takeoff or Landing?.Why Should Seats Be Upright During Takeoff and Landing?.What Would Happen If a Window Opened on an Airplane?.Do You Need to Close the Window Shades on Long Flights?.Why Do Planes Turn the Lights Off When Landing?. ![]() ![]() ![]() Why Do Airlines Open the Shades During Takeoff and Landing?. ![]()
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