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If you're in a plane made of metal cylinders floating through the air at 600 mph, it's nice to know that the strange things you hear and see do not mean you're going to die. Here are some airplane sounds you should not worry about.

One, two or three (or more) chimes

Every airline uses chimes differently. A gong beat may be the pilot warning the flight attendant of turbulence or asking the flight attendants if the pilot wants a cup of coffee. Two bells usually mean the plane is approaching 10,000 feet.

Three or more chimes indicate a more serious problem, such as a very sick passenger or imminent extremely rough air.

"Doors for arrival and cross-checks"

When the doors of an aircraft are closed, an escape slide is automatically activated. "Doors to arrival" recalls that cabin crew should disarm the chute, and "cross check" is an instruction to check the door of another cabin crew member.

When boarding beat

It is very common to hear when getting on a plane or waiting in your seat at the gate. This is just the cargo that is loaded onto the aircraft under the cab.

Flickering lights

A lot of airlines plug into the airport's power supply when planes are on the ground. When an aircraft moves away from the gate, the pilot switches from the ground power source to the onboard, causing the lights in the cabin to temporarily flicker.

Two punches and a high Whir right after the start

When the aircraft lifts off the ground, the pilot pulls the wheels into the body of the aircraft and sequentially closes the flaps behind them (strike, blow). This whirring comes from the pilot who pulls back the wing flaps needed to lift the plane off the ground.

Both of these actions are part of the process of "cleaning the plane" to make it streamlined for the flight.

White "smoke" in the cabin

The white smoke you see from the vents is the water vapor (similar to the mist) that appears when warm and cold air mixes. Often the white steam will appear in hot and humid conditions, either by plane on the floor with open doors or when an airplane flies through a storm.

The post The shocking reasons behind six common aircraft noise first appeared,

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