When should you worry if you hear an unusual sound in your long flight?
While in a plane more than 10,000 meters above the ground, any unusual sounding sounds, it can be worrying. But in most cases, you're just 'god of souls ', because what you hear and see, doesn't mean there's an imminent plane crash. Please also review the 'harmless' sounds on the plane.
When passengers board the plane or sit at the waiting door, the crashing sounds are the sound of ground personnel moving luggage into the storage compartment at the bottom of the aircraft.
Most aircraft will connect to the airport electricity grid when parked on the ground. When an airplane leaves the door, the pilot will switch from the ground power system to the spontaneous power supply, which will lead to an automatic shutdown of the cabin light system.
There are many different sounds in a flight.
After the plane leaves the ground, the pilot will control each wheel to be pulled up and applied to the fuselage. This causes two thumps, thumps (corresponding to two wheels).
According to John Cox, a retired pilot, each airline will use the bell in different ways. A bell can mean the pilot warns the flight attendants, the plane is passing through the noisy area or simply the flight attendant asks if the pilot wants to drink coffee. Two normal bells signaled the plane had reached a height of 3,000m. Three or more bells can warn a more serious problem, such as a sick passenger, or very bad outside weather conditions .
When the plane begins to decrease in height, the noise emitted from the engine will gradually decrease. To make the aircraft slow down and land safely, the aircraft's aerodynamic adjustment plate system will be activated - these are the long panels on the wing that open to block the wind. At this time, the passenger in the cabin will hear rustling and shake slightly.
Once the plane hits the ground, a sound like the engine is accelerating again to take off. The reason is that the pilot reverses the propulsion to slow down the aircraft. At this time, passengers will hear a loud sound from the engine, and feel like being pushed forward.