A display system configured for displaying critical aeronautical information on an aircraft display that is not certified for displaying critical aeronautical information comprises a mounting adapter and an application server. The mounting adapter is configured to mount, in an aircraft cockpit, a personal electronic device (PED) wherein the PED is not certified to display critical aeronautical information. The mounting adapter further comprises a surface with an actuatable covering that is configured to be overlaid on a PED display and an actuation source configured to actuate the covering. The application server is configured to execute a module that generates critical aeronautical information, transmit the generated critical aeronautical information to the PED for display, determine whether a problem exists with the image displayed on the PED display, and enable the actuation source to cause the covering to annunciate a message indicating a problem with the image displayed on the PED display.