Earlier this week on the afternoon F9 320 DEN-MKE as we are climbing through the usual bumps I heard a loud rushing sound seem to come from the engines (louder than the usual engine noise--we were in row 5). The seat belt sign was still on but the FAs were up and about. My usual reaction to an unexpected airborne event is to look at the FAs and see their reaction, which is usually "ho-hum". Then I feel better. This time however, the FA (I think he was a new employee, he just seemed kind of clumsy, and the other FA seemed to be showing him "the ropes") got a worried look on his face and turned to the other FA still seated (buckled?) in her jump seat behind that divider wall as you board and said, "What is that?!" Whatever her reply was (I couldn't hear or see her) he immediately sat down and buckled up, which worried me. The noise lasted maybe 30 seconds to 1 minute. It wasn't the usual full throttle engine noise, it was louder than that. The rest of the flight was uneventful. I know my fellow FTers will tell me what this noise was and not to worry about it!

Sorry, I can't help with the noise question, but glad you landed safely. As for the clumsy FA, perhaps BB is at it again.

I might be able to add more later if I'm able to ask the right people and bring it up. But first, like you implied, it must have not been anything to worry about. Pretty sure the pilots would have heard the noise and acted accordingly. Did they get back up after talking with the pilots over the phone?

There was one flight where after take-off from DEN-MKE we had to turn around right away because the pilots said that there was an engine indication light that turned on that they didn't like. However, there were no rushing/wind noises coming from the engine. They made sure to announce it to the cabin soon after they noticed the problem.


...I thought this post was going to be about the hydraulic pumps equaling each other out when the plane is on the ground.

Sometimes the landing gear get a high temp indication after takeoff, and the doors will be opened for a bit to cool 'em off. Literally. That makes a rushing noise that might have sounded like it was coming from the engine.

Usually (in my limited pax experience) they do this in level flight, not when climbing.

Definitely sounds like what it would be. That noise always tells me that it's about time to land!

I've had that experience before. Yes they do level out before "cooling the gear" and not while climbing. From what I heard from others, the pilots will ask to maintain a certain altitude, lower the gear until the temp issue is resolved, and then ask to continue climbing to normal cruising altitude.