Test and Indication

There are two light emitting diodes (LEDs) and a test switch on the front of the VOR/MB receiver. The LEDs show receiver test status when you do a test of the VOR/MB receiver. The red control fail LED shows the status of the tune inputs. The green or red LRU status LED shows the status of the receiver test. You can do a test of the VOR/MB receiver from the NAV control panel or from the test switch on the VOR/MB receiver front panel. When you do a test of the VOR function of the left VOR/ MB receiver, you do a test of the VOR function and the marker beacon function at the same time.