When looking at the FAA category, class, type list, you have airplane single-engine land, multi-engine land, etc. but just rotorcraft helicopter, gyrocopter, etc.
How do I specify a multi vs single engine helicopter? Does the FAA differentiate, or are you able to fly a multi engine helicopter the day you get your helicopter certificate?
For context, I'm making a web form where an operator can add their aircraft, and I want to be able to sort by single or multi engine helicopters because sometimes people request a multi engine helicopter.