This is my sounds for the UH-1D. I have made sounds from scratch based on sources from you tube. Most of the sounds out there in is for the older Huey. Look in Description for Preview.
UH-1D Custom Sounds.
I included a partial tweak file so you can see the volume settings and setting to sync the rotor max speed animation with the Startup-sound.
The shut down sequence may be a little long but that can be adjusted.
Sources used are from SAR-Bundeswehr Bell UH-1D found on YouTube.