Date & Time: Anytime since 5.0 release
Frequency: Any time you fly with the Ironfrog Mover
World name: Coeurl
Character name: Olefin Raydric
Class/Level: Any class
Party or solo: Both
In-game time: Any time
Area and coordinates: Everywhere with flight enabled
Steps:
1. Go to map with flight enabled
2. Mount Ironfrog Mover
3. Fly
4. Listen to the sound of wheels turning but there is no wheels.

The wheel sound is supposed to come from the wheels rolling the ground, when you fly the wheels get inside and rockets come out, yet the flying sound is still the ground sound.