A type rating is an authorization entered on or associated with a pilot license and forming part thereof, stating the pilot's privileges or limitations pertaining to a certain aircraft type. Such qualification requires additional training beyond the scope of the initial license and class rating.
ICAO stipulates that:
In the United States, all turbojets require a type rating. Aircraft with a maximum take-off weight of more than typically require a type rating. In many countries pilots of single-engine piston aircraft under a certain maximum weight (5,700 kg or 12,500 lb, typically) do not require a type rating for each model, all or most such aircraft being covered by one class rating instead. In New Zealand there are no class ratings, each aircraft model requires its own rating. Countries which have adopted the class rating system for small aircraft typically require additional training and license endorsement for complexity features such as conventional undercarriage (tailwheels), variable-pitch propellers, retractable undercarriage, etc.
Many commercial aircraft share type ratings, allowing qualified pilots to transition from one to another with differences training without the need to go through the full certification process. Examples include the Boeing 757 and Boeing 767, Boeing 777 and Boeing 787, the entire 737NG family, Airbus A330 and Airbus A350 and all of the members of the A320 family (the A318, A319, A320, and A321).
In the United States some type ratings can be issued with a "visual flight rules (VFR) only" limitation when the type rating checkride was conducted without instrument flight rules (IFR) approaches or operations, but only VFR maneuvers and procedures. This is most typical in older aircraft (i.e. Ford Trimotor, N-B25, B17, etc.)
Although much of the training for a type rating can be carried out in a simulator, type ratings require some training in the relevant aircraft. However, a pilot with sufficient experience on one aircraft can undertake a type rating for a different aircraft as a "Zero Flight Time Training" (ZFTT) course. This is carried out entirely in a simulator, saving fuel and money.
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