As a young boy and first-time flyer, I often found myself frightened by the strange sounds I encountered on airplanes, especially when I didn’t know what they were. The flickering lights and rattling noises during takeoff were particularly unnerving. Over time, I’ve come to realize that these sounds are normal, and now I’m excited to share the explanations behind these peculiar noises, so you too can understand what’s happening during your flights.
In-flight Communication and the Air Conditioning System
You’ve probably heard those familiar “bing-bong” sounds coming from the overhead speakers. These are used by pilots and flight attendants to communicate with each other or to signal that they should pick up the intercom. You might also notice a change in the noise or wind coming from the air conditioning system. This can happen when the power or air is needed for other purposes, such as pressurizing the cabin or preparing for takeoff.
Electrical Power Shifts and Overhead Bin Rattles
When you see flickering lights or hear systems spinning up or down, it’s usually due to a change in the source of electrical power the plane is using. This can come from the engines, the auxiliary power unit (APU), or ground power when parked. On a related note, don’t worry if you hear overhead bins rattling during takeoff, landing, or turbulence – they’re designed to withstand some movement.
Generators During Single Engine Taxi
You might hear a high-pitched whining sound as the plane taxis before takeoff or after landing. This noise comes from the generators running when the plane is doing a one-engine taxi to save fuel.
Engine and Landing Gear Noises
A whining or roaring noise at the back of the plane is often the APU, a mini-turbine engine that provides extra power. You might also hear what sounds like engines shifting gears, which is normal as they spin up from a standing start or during takeoff. A series of bumps on the runway are usually caused by the joins between sections or wheels rolling over runway lights.
Takeoff and Landing Sounds
After takeoff, you might hear a rumble-thump as the landing gear is retracted by the hydraulic systems. This can be especially noticeable if you’re seated at the front or near the wings. The engine noise will diminish at the top of descent, as pilots start their landing procedures. You’ll also hear a rumbling noise as the wing flaps and slats extend during landing, which helps the plane generate more lift.
Final Approach and the Barking Dog
On final approach, you’ll hear mechanical sounds, wind noise, and a thump as the landing gear doors open and lock into place. This is your cue to get ready for landing. Finally, if you’re on an Airbus plane and hear what sounds like a dog barking under the plane, don’t be alarmed! It’s actually a system that adjusts hydraulic pressure when the pilots are using just one engine, like during startup or taxiing more efficiently.
Now you know what’s behind those strange sounds on an airplane, so sit back, relax, and enjoy your flight!
First love never dies. I fell in love with airplanes and aviation when I was a kid. My dream was to become a pilot, but destiny led me to another path: to be an aviation digital media content creator and a small business owner. My passion for aviation inspires me to bring you quality content through my website and social accounts. Aviation is indeed in my blood and blog!
