Hello everyone. I was watching some trip reports and I came across a flight with a CRJ900. Everytime I watch a trip report on a CRJ, I always hear this beeping sound, typically most heard around takeoff and landing. I have never heard any sound like this on any other aircraft. I even heard it myself on my flights on an American CRJ a few weeks ago. I don’t know if it’s just an engine sound or the APU but if anyone can tell me what it is, that would be great. Skip to 46:17 to hear what I’m talking about. https://m.youtube.com/watch?v=PS0MfDJAu6M
What sound are you talking about… I hear the engines running and the A/C and thats about it
I messed up on the video time stamp. It’s actually 46:17. The sound in the background
I don’t hear anything
I messed up on the time stamp. Skip to 46:17 in the video. The subtle sound in the background.
Just edit your post😁
Even then I still hear engine sounds
Its like a duck quacking? @Jack
I don’t think there would be a duck on a plane😂
If that’s what you want to call it. I literally can’t describe the sound at all. But it’s there.
Hence the term "like"😉
I mean the closest I can think of is the flaps extending🤔
It’s like a very slow beeping sound. It’s clearly not the flaps since no flaps are being extended or retracted.
My best guess since it’s over the wings and fuselage, its some type of hydraulic pump, similar to the dog barking noise on the A320. PTU I think?
That makes sense. The sound is also a lot slower at cruising and then the sound speeds up during takeoff and landing.
Flaps being extended?
That’s what I suggested, but no, it’s not.
ARe you sure? The flaps go down and that sound comes on?
Idk what video yall are watching, but at 46:17 the flaps are very clearly being lowered, which is what the sound is