For fixed wing pilots looking to do the rotorcraft add-on, you can add the category to your license by completing the following requirements:
- hold a PPL certificate
- hold a current FAA medical certificate
- obtain 30hrs in a helicopter (including 10hrs of solo time)
- pass an FAA oral and check ride.
found at heliflights.us (unconfirmed at FAA)
For commercial fixed wing pilots looking to do the rotorcraft add-on, you can add the category to your license by completing the following requirements:
- hold a CPL certificate
- hold a current 2nd class FAA medical certificate
- obtain 50hrs in helicopters (including 35hrs PIC)
- 10hrs cross country time
- 10hrs instrument in an aircraft
- pass an FAA oral and check ride.
Pilot Certification 