Front Panel Indications

The test switch starts a self-test.

The light emitting diode (LED) status indicators on the front panel show for these conditions:

· LRU STATUS (green), if there are no LRU failures

· LRU STATUS (red), if there is an LRU failure

· ANTENNA TOP FAIL, if the top antenna fails

· ANTENNA BOT FAIL, if the bottom antenna fails

· ALTITUDE FAIL, if the altitude input from the ADIRU fails

· CONTROL FAIL, if the control panel input fails.