The Brake Cooling 737 Lite app is capable of calculating the Brake Cooling Schedule for B737-300 with Brakes A and B options. It is based on intuitive use and logical inputs order. The app uses QRH's logic, the calculation can be done in less than one minute and the results are presented for easy switching between NO REVERSERS vs. REVERSERS 2nd DETENT data. Nevertheless The Brake Cooling 737 Lite app does not substitute any certified source of operational data and the use is solely upon user's responsibility.