Having spent too much time at a summoning stone next to someone who just had to sit in his gyrocopter ....

This hush kit silences the gyrocopter by providing alternative, empty sound files. Unpack the archive in World of Warcraft\Data. Some subfolders will be created, and within Data\Sound\Creature, you will find a folder named Gyrocopter, containing the empty soundfiles.

To get your gyrocopter sounds back, simply remove the Gyrocopter folder.

Enjoy - I certainly do ;o)