Why is it that it is ….?

The document contains answers to the following questions:

1. What are those “arrows” marked inside of the cabin of the aircraft ?

2. Why cabin crew dims the lights while landing ?

3. Do oxygen masks only have about “15-minutes worth of oxygen” ?

4. What are those “White Lines” in the sky ?

5. Do aircrafts have secret “Beds” ?

1. What are those “Triangles” marked inside of the cabin of the aircraft ?

Inside the aircraft cabin above the window of some seats there are either red or black triangles marked. An especially astute passenger will notice that these little triangles throughout the cabin line up with the wings outside the plane.

If flight crew need to check the wings, these triangles mark a vantage point for a clear view. The markings are especially helpful in wintery conditions to make sure the wings are properly de-iced (an inspection required before takeoff, although this is generally done by crew on the ground).

2. Why cabin crew dims the light while landing ?

When a plane lands at night, cabin crews will dim the interior lights. Why? In the unlikely event that the plane makes an emergency landing and passengers need to evacuate, their eyes will already be adjusted to the darkness. Our pupil takes time to dilate or contract and get adjusted to the ambient lighting. Thus dimming of lights during take off or landing basically adjusts the eyes to the ambient lighting helping save seconds in case of an emergency situation.

Similarly, flight attendants ask passengers to raise their window shades during landing for them to asses if a particular side will be safe or suitable for an emergency evacuation.

3. Do oxygen masks only have about 15-minutes worth of oxygen ?

The safety instructions on most flight include how to use the oxygen masks that are deployed when the plane experiences a sudden loss in cabin pressure. However, one that thing that the flight attendants don’t tell you is that oxygen masks only have about 15-minutes worth of oxygen. That sounds like a frighteningly short amount of time, but in reality that should be more than sufficient. Remember, oxygen masks drop when the airplane cabin loses pressure, which means the plane is also losing altitude. A pilot will respond to that situation by donning an oxygen mask and moving the plane to an altitude below 10,000 feet, where passengers can simply breathe normally, no extra oxygen required. That rapid descent usually takes less than 15 minutes, meaning those oxygen masks have more than enough air to protect passengers.

4. What are those “White Lines” in the sky ?

Those white lines that planes leave in the sky are simply trails of condensation, hence their technical name of “contrails.” Plane engines release water vapor as part of the combustion process. When that hot water vapor is pumped out of the exhaust and hits the cooler air of the upper atmosphere, it creates those puffy white lines in the sky. It’s basically the same white puff of air that you see when you breathe when its cold outside.

5. Do aircrafts have secret “Beds” ?

On long-haul flights, cabin crew may have to work for about 16-hours. To help combat fatigue in such situations, some planes, like the Boeing 777 and 787 Dreamliners, are outfitted with tiny bedrooms where the flight crew can get a little shut-eye. The bedrooms are typically accessed via a hidden staircase that leads up to a small, low-ceilinged room with 6 to 10 beds, a bathroom, and sometimes in-flight entertainment.

Loving it? Stay with us for the part 4 of Facts and Myths. Do not forget to hit the like button. Also shoot down such questions in the comment section that are still unanswered, we will answer them in the next part of this article.

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