Why Do Airplanes Turn Off Lights During Takeoff and Landing? Airline Reveals 3 Hidden Truths About Flying

Airplanes are considered one of the safest modes of modern transportation. Whether it's standard procedures instructed by flight attendants or unique design details of the aircraft itself, everything is backed by rigorous engineering science and aviation regulations. Starlux Airlines has shared various aviation safety facts on its official social media platform, explaining how seemingly routine rules and structures play a critical life-saving role in emergency situations.

Dimming Lights and Opening Window Shades During Takeoff and Landing: Visual Adaptation for the 'Black 13 Minutes'

Many passengers experience flight attendants requesting them to 'upright seatbacks, open window shades, and dim cabin lights' during takeoff and landing. This standard operating procedure is closely related to the 'Black 13 Minutes,' a critical phase known as the most accident-prone period during the entire flight.

The primary purpose of dimming the lights is to allow passengers' and crew members' eyes to pre-adapt to darkness in case of an unexpected power failure. In an emergency, this prevents panic or crowding caused by pupils failing to adjust to sudden light changes, enabling passengers to quickly follow external light sources and emergency exit signs for a safe evacuation.

Airplane Seat Belts Use a 'Two-Point' Design: Aligned with Protective Postures and Emergency Protocols

Unlike the common 'three-point' seat belts in cars that cross over the chest, most passenger seats use a 'two-point' seat belt fixed at the waist. This design choice is related to the operational characteristics of aircraft and emergency response mechanisms.

Aircraft rarely experience sudden braking like cars during flight. According to aviation accident investigations, the most effective protective posture during an emergency landing is to 'bend forward and lower the head.' A two-point seat belt effectively secures the lower body while allowing sufficient upper body movement to perform this protective action. A three-point design would restrict this posture, making the two-point configuration more suitable for aviation safety requirements.

Rounded Corners and Tiny Vent Holes in Aircraft Windows: Structural Engineering to Disperse High-Altitude Pressure

Observing aircraft windows, you'll notice their corners are rounded rather than the square shapes common in buildings. In early aviation history, square windows caused metal fatigue cracks and aviation accidents due to pressure concentration at the sharp corners under the significant pressure difference between the cabin interior and exterior at high altitudes. Engineers later adopted rounded and elliptical designs, successfully distributing pressure evenly across the fuselage structure and enhancing overall flight safety.

Additionally, aircraft windows consist of three layers of acrylic resin: outer, middle, and inner. The outer and middle layers bear the main pressure differential, while the inner layer provides physical protection. A tiny 'bleed hole' in the middle pane primarily functions to balance the air pressure between the window layers, ensuring the outer pane bears the main pressure. Even if one layer is damaged, the multi-layer protection mechanism maintains cabin integrity, ensuring a safe landing.