Frontier Airlines' Squeaky Squeegee Sounds
|Frontier planes with a few of their|
cute animals (source)
|a photo of mine from Denver|
International Airport—Frontier's hub
I personally know nothing about airplane mechanics, but it seems from the posts of enthusiasts and experts here and here (and in other threads and on other websites) that this squeaky squeegee "barking" sound is created by the Power Transfer Unit (PTU) when there is just one engine running. Since the PTU is located near the wing roots, it makes sense that I felt the sound was going on right underneath me on a few of my flights, when I sat next to the wings. And, since the noise only happens when one engine is running, it makes sense that it only occurs for brief periods of time during pushback or taxiing.
I'm glad I finally took the time to find out about this quirky noise and why I had only ever heard it on one airline. It turns out different models of airplane all have their quirks, and the Airbus A319 and A320s, like those used by Frontier Airlines, just happen to have PTUs that make silly squeaky squeegee sounds. I hope this post provides you with an answer to your gnawing question, or just a bit of amusement (or fair warning for the future). On Peter's Publisher, you never know what I'll write about next.