EGPWS Normal ProceduresKTA 970/KMH 980 Pilot’s Guide
Rev 3 006-18273-0000
55
NORMAL PROCEDURES
GA-EGPWS SYSTEM SELF-TEST
Prior to flight, the system should be tested for proper operation.
Normally, this is done by the pilot during the BEFORE TAKE-OFF check.
All aircraft power and systems should be up and running, and the GA-
EGPWS “Not Available” annunciator lamp should be off.
NOTE: Because the system requires GPS information to operate, it may
be several minutes after power-up before the aircraft GPS system sup-
plies accurate information to the GA-EGPWS. If the internal GPS card is
used to supply position information, it may take additional time for satel-
lite acquisition depending upon the frequency of use of the system. The
internal GPS card requires a current almanac to locate GPS satellite
positions. This almanac can take several minutes to load. When an
accurate GPS position is acquired and the rest of the GA-EGPWS sys-
tem is available, the “NOT AVAILABLE” lamp will extinguish.
To perform a normal GA-EGPWS Self-Test:
• Press the Self-Test switch. When a Self-Test is initiated, the GA-
EGPWS first checks for any configuration (installation or database)
errors. If any are detected, it is audibly enunciated and the test is ter-
minated. If none are detected, the test continues through a sequence
resulting in turning on and off all system annunciators, enunciating
specific audio messages, and if enabled, displaying a video test pat-
tern on the terrain display. Any functions determined inoperative are
also enunciated. The Self-Test terminates automatically at its conclu-
sion.
The following is a description of the expected results of a typical level
1 Self-Test. Actual annunciation nomenclature and sequence may dif-
fer depending on the installation.
• Observe that the amber “Not Available” and red “Warning” annuncia-
tor lamps associated with the system illuminate.
• Observe that the voice callout “EGPWS SYSTEM, OK” is heard.
• Observe that the red “Warning” annunciator lamp extinguishes, and
the amber “Caution” annunciator lamp illuminates.
• Observe that the GA-EGPWS Terrain Display shows the Test
Pattern.
• Observe that the Terrain Display Test Pattern is removed.
• Observe that the amber “Caution” and amber “Not Available” annunci-
ator lamps associated with the system extinguish.
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