A319 noises in cabin
On a recent flight down the back of an A319, as the Captain was starting #2 engine, there was a loud and heavy cyclical thumping noise from the rear galley with a frequency of around 3 cycles per second which caused the trollies to shake vigorously and the cabin lights to flicker in sympathy.
The crew explained that there was a problem with the APU air bleed valve and the engine was started using ground equipment.
In all the sectors I have flown down the back of numerous a/c types, I had never heard a systems noise giving out so much energy as this before. Is this typical of the A319?
On a lighter note, what causes the noise which sounds like a load of dogs barking in the hold?