roflcoptersayswhat?
... doesnt say anything, just ... smiles ?
Anyway, in certain specific occasional motion situations - those outside of the normal user guide mentioned flight normals - the helicopter can be soundless. So if you dont use hi-pitch sound reverter technology on your headset, than its probably one of these situations:
- both-left-handed pilot training situation No. 024: You need a good crane expert for fixing that one.
- Surveillance cat-copter: Those are designed to be soundless.
- I dont think this one needs any description. Doe, you should keep being mad on hawing no-dynamite, no-smoke and no-explosions issues.
Anyway, please contact just the heliport technical crew servicemen, not the pilots. Or a heli-doctor, he knows how to listen to their rotors ...