Front Panel LED Indications

These are the status light emitting diodes (LEDs):

· A green PASS to show that there is no TCAS computer

failure

· A red FAIL to show a TCAS computer failure

· A red XPNDR to show an ATC transponder interface failure

· A red UPPER ANT to show a top TCAS antenna failure

· A red LOWER ANT to show a bottom TCAS antenna failure

· A red RAD ALT to show no radio altitude data from the RA

· A red HDNG to show no heading data from the ADIRU

· A red R/A to show a DEU display function failure

· The red T/A does not operate.