During a recent flight on a Delta A320, my wife asked me about some odd markings on the wall. About 3 rows behind the aft over-wing exit, there was a triangle on the wall, it was in the same location on both sides of the aircraft. It seemed to line up more with the trailing edge control (flaps) than any central point on the wing.
My speculation was some sort of a balance point, or “this is the middle row of the aircraft” indicator for the flight crew. Was I right?
I’m still not sure about the “barking dog” sound (this is how the cabin attendant described it) during taxi. The attendant that I asked said it was the hydraulic systems pressurizing, but I’m not sure I believe him. I suspect it was the “just give an answer” answer.
I’m usually really good about the sounds in an aircraft, and am fairly knowledgeable about aircraft operations (for a non-pilot airplane groupie), but understand the frustration that they probably feel.
