Which of the following is NOT a requirement for obtaining an IFR rating?

To obtain an Instrument Flight Rules (IFR) rating, there are specific requirements outlined by the Federal Aviation Administration (FAA). One of these requirements is that a pilot must have a minimum of 50 hours of cross-country flight time and 40 hours of actual or simulated instrument flight time. Additionally, successful completion of a written, oral, and flight test is mandatory to demonstrate the pilot's knowledge and skills.

The requirement stating a minimum of 100 hours of total flight time is indeed a common benchmark found in various pilot training guidelines; however, it does not pertain to the specific requirements for acquiring an IFR rating. Therefore, while having flight experience is important, it is not specified as a prerequisite in the context of obtaining an IFR rating. This makes the choice regarding the 100 hours of flight time the one that does not meet the IFR rating requirements.