specific audio messages, and if enabled, displaying a video 
test pattern on the terrain display (see illustration below). Any 
functions determined inoperative are also enunciated (e.g., 
“GLIDESLOPE INOP”). The Self-
automatically at its conclusion. 
The following is a description of the expected results of a 
typical Level 1 Self-Test. Actual annunciation nomenclature 
and sequence may differ depending on the installation. 
•  GPWS INOP, W/S INOP, and TERR INOP annunciators 
turn on.  
•  Amber caution (“BELOW G/S” or “GPWS”) annunciators 
turn on. 
•  “GLIDESLOPE” is announced over speaker. 
•  Amber annunciators turn off. 
•  G/S CANCEL annunciators turn on (if installed). 
•  G/S CANCEL annunciators turn off. 
•  Red warning (“PULL UP” or “GPWS”) annunciators turn 
on. 
•  “PULL UP” is announced over speaker. 
•  Red warning annunciators turn off. 
•  Red Windshear warning annunciators turn on. 
•  (Siren) “WINDSHEAR, WINDSHEAR, WINDSHEAR” is 
announced over speaker. 
•  Red Windshear warning annunciators turn off. 
•  Amber Windshear caution annunciators turn on (if installed 
and enabled). 
•  Amber Windshear caution annunciators turn off. 
•  Red warning (“PULL UP” or “GPWS”) Terrain Awareness 
annunciators turn on. 
•  “TERRAIN, TERRAIN, PULL UP” is announced over 
speaker. 
•  Red warning Terrain Awareness annunciators turn off. 
•  Amber alert Terrain Awareness annunciators momentarily 
turn on, then off.