The term mechanician is also used by the Irish Navy to refer to junior engine room ratings. In the British Royal Navy, Chief Mechanicians and Mechanicians 1st Class were Chief Petty Officers, Mechanicians 2nd and 3rd Class were Petty Officers, Mechanicians 4th Class were Leading Ratings, and Mechanicians 5th Class were Able Ratings. The rate was only applied to certain technical specialists and no longer exists.