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the accuracy and/or fidelity to be the sole source for
deciding terrain or obstacle avoidance. Navigation must not
be predicated upon the use of the EGPWS terrain/Obstacle
display.
• If there is no source of aircraft position data meeting the
accuracy requirements for the TAD and TCF functions, then
these enhanced functions are automatically inhibited with a
resultant Terrain inoperative or unavailable indication.
• TAD/TCF functions should be manually inhibited within 15
nm on approach to an airport or runway that is not in
the airport/runway database to avoid unwanted alerts.
• TAD/TCF functions should be manually inhibited during
QFE operations if GPS data is unavailable or inoperative.
• TAD/TCF functions should be manually inhibited for
ditching or other off-airport landings.
• When the TAD/TCF functions are inhibited and the EGPWS is
otherwise functional, the EGPWS reverts to providing
basic GPWS functions (Modes 1 to 6 and Windshear). In
this state, the EGPWS may give little or no advance warning
time for flight into precipitous terrain where there are few
or no preceding obstructions. This particularly applies if:
• The aircraft is in the landing configuration.
• The aircraft is in a stabilized descent at a
normal approach descent rate.
• There is no ILS GLideslope signal being recieved by the
EGPWS (not tuned, not available, or inoperative).
• Terrain clearance or descent rates that are not compatible
with required minimum regulatory standards for Ground
Proximity Warning equipment may cause unwanted alerts.
• If enabled, the EGPWS uses onboard measurement of air
mass parameters and aircraft acceleration for detection of
windshear. This is a reactive system and cannot predict
windshear, which may be ahead of the aircraft.
060-4241-000 • Rev. E - December 2003
46 MK V & MK VII EGPWS Pilot Guide
System
Activation
• The EGPWS terrain/obstacle database includes
cataloged human-made obstructions 100 feet high or
greater within North America and portions of Europe and
the Caribbean (expanding). The database is not all-inclusive
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
• IRS, AHRS, VG (attitude)
• GPS, FMS, or IRS (position)
• Landing gear
• Landing flaps
• Stall warning or AOA (windshear only)
• Weather Radar, 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
annunciated (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).
Some installations utilize redundant systems so that if the
primary source of data fails, the EGPWS continues on the
secondary source.
System
Constraints
continued
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 47
EGPWS status annunciations are provided for GPWS
inoperative (mode 1-6 functions), Terrain inoperative (TAD/
TCF functions), and windshear inoperative.
Refer to an appropriate AFM or EGPWS AFMS for specific system
and status requirements.
The EGPWS provides a Self-Test capability for verifying and
indicating intended functions. This Self-Test capability consists
of six levels to aid in testing and troubleshooting the EGPWS.
These six levels are:
Level 1 – Go / No Go Test provides an overview of the current
operational functions and an indication of their
status.
Level 2 – Current Faults provides a list of the internal and
external faults currently detected by the EGPWC.
Level 3 – EGPWS Configuration indicates the current
configuration by listing the EGPWS hardware,
software, databases, and program pin inputs
detected by the EGPWC.
Level 4 - Fault History provides an historical record of the
internal and external faults detected by the EGPWC.
Level 5 - Warning History provides an historical record of
the alerts given by the EGPWS.
Level 6 - Discrete Test provides audible indication of any
change to a discrete input state.
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