Citation CJ4 is an aircraft training aid designed to help pilots with memory recollection of aircraft systems of the CE525C. Created by a CE525S Type Rated Pilot, this i-Phone and i-Pad application provides a fast and easy way to study on the go. Study categories include Memory Items, Limitations, and Aircraft General. The information is displayed in a question and answer flash card format. Once you have studied all categories, a quiz is available to test your knowledge! But, watch out! You may get pink slipped! Download the app today to see if you are ready!