Final answer:
The FAA allows up to 20 hours of training in an approved FTD to be applied towards a 40-hour instrument rating requirement.
Step-by-step explanation:
Instrument Rating and Flight Training Device (FTD):
A pilot with an instrument rating is qualified to use the aircraft's instruments alone to navigate in low visibility situations. One kind of flight simulator used to instruct pilots is called a Flight Training Device (FTD).
The Federal Aviation Administration (FAA) permits up to 20 hours of training in an authorized FTD to be applied toward the 40-hour instrument rating requirement in terms of time credited toward an instrument rating. As a result, an FTD can provide you with up to half of your instrument rating training hours.