The three medical standards expressed in the CASR relate to Class 1, 2 and 3 medical certificates as follows:
| Medical standard | Applicable to |
|---|---|
| Class 1 | Holders of Air Transport Pilot Licence, Commercial Pilot Licence, Flight Engineer or Flight Navigator Licences. |
| Class 2 | Holders of Student Pilot, Private Pilot, Commercial Pilot Balloons and Flight Radio Operator Licences. |
| Class 3 | Holders of Air Traffic Services qualification (air traffic control or flight service licences). |
An additional administrative standard (not expressed in the CASR) is now used for the 'Basic Class 2' certificate issued by CASA pursuant to an exemption.
| Medical standard | Applicable to |
|---|---|
| Basic Class 2 | Private pilots flying piston engine powered aircraft (limited to the visual flight rules) carrying up to five non-fare paying passengers. |