 Further flight and systems information are displayed on multi-function displays (MFD).The left-hand MFD is the primary flight display (PFD), typically showing radar and moving-maps; the right-hand MFD is the system display (SD), presenting information about the engine, landing gear, slat and flap settings, and fuel and weapons status.Initially, the F-16A/B had monochrome cathode ray tube (CRT) displays; replaced by color liquid-crystal displays on the Block 50/52.