investdude wrote:The airspeed indicator is all the numbers on the left side of the picture of a PFD (Primary Flying Display) that you posted. From 120 at the bottom to 140 160 175 200 220 (and 175 at the top). The red bars at the top of the airspeed indication and at the bottom indicate speed ranges that you must avoid entering in your present configuration (gear, flaps). If you don't have those red bars on the PFD for your B747-400 and A321 it means you either are not in a configuration with any speed ranges to be avoided or this feature is not available on that particular PFD. So no need to do anything, there is nothing wrong.