060-4314-000 • Rev. C - May 2004
48 MK VI & MK VIII EGPWS Pilot Guide
System
Activation
System
Constraints
Continued
• The EGPWS terrain/obstacle database includes cataloged hu-
man-made obstructions greater than 100 feet high within
North America, and portions of Europe and portions of Asia
(expanding as data is obtained). The database is not all-in-
clusive and newer, smaller, or unknown obstructions could
be encountered.
Refer to an appropriate AFM or EGPWS AFMS for specific system
limitations and procedures.
The EGPWS is fully active when the following systems are powered
and functioning normally:
• EGPWS
• Radio Altimeter
• Air Data
• ILS or Glideslope Receiver
• AHRS, IRS, VG, DG (Attitude & Heading)
• GPS (position)
• Landing gear
• Landing flaps
• Weather Radar Indicator, EFIS, or a dedicated terrain display
(if terrain/obstacle display enabled)
In the event that required data for a particular function is not
available, then that function is automatically inhibited and an-
nunciated (e.g. if position data is not available or determined
unacceptable, TAD and TCF is inhibited, any active terrain display
is removed, and “TERR INOP”, “TERR UNAVAIL” (or equivalent)
is indicated).
EGPWS status annunciations are provided for GPWS inoperative
(mode 1-6 functions), and Terrain inoperative (TAD/TCF func
-
tions).
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