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“Flaps, Flaps” c ........................................................................................ 6
“RAAS Advisories” ............................................................................ RAAS
Notes:
a) May also be "Mininum", “Minimums, Minimums”, "Decision Height" or “Decide”.
b) May also be “Approaching Decision Height”, “Fifty Above”, “Plus Hundred”.
c) Message is dependent on aircraft type or option selected.
d) Windshear detection alerts provided for some aircraft types.
e) Audio alert may or may not be enabled.
f) May also be “Terrain Ahead, Terrain Ahead”.
g) May also be “Obstacle Ahead, Obstacle Ahead”
h) May also be “Terrain Ahead Pull Up”
i) May also be “Obstacle Ahead Pull Up”
j) May be preceded by siren.
k) "Pull Up" voice may be proceded by “Whoop, Whoop”
TA=Terrain Look-Ahead Alert
TCF=Terrain Clearance Floor
RAAS=Runway Awareness Advisory System
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 39
Air Data
The EGPWS uses various input signals from other on-board
systems. The full compliment of these other systems is
dependent on the EGPWS configuration and options selected.
Systems providing Altitude, Airspeed, Attitude, Glideslope, and
position are required for basic and enhanced functions.
Accelerations, Angle-of-Attack (AOA), and Flap position is
required for Windshear. Inputs are also required for discrete
signal and control input.
The EGPWS utilizes signals from the following systems:
Uncorrected and corrected Barometric Altitude, Altitude rate,
Computed Airspeed, True Airspeed, and Static Air Temperature
are provided by Air Data system.
Radio Altitude is provided by a Radio Altimeter system.
Decision Height or Decision Height Altitude is provided by a
Radio Altimeter system or ancillary system.
In -210-210 and later versions, the EGPWC performs Radio
Altitude reasonableness checks based on the Computed
Terrain Clearance (pseudo-radio altitude). Computed Terrain
Clearance is computed by subtracting the elevation of the
(database) terrain below the aircraft from Geometric Altitude
(ASL). Radio Altitude is considered unreasonable when it
indicates a terrain clearance that is less than the Computed
Terrain Clearance by more than 2000 feet (1500 feet with
version -218-218 or later). For example, if the Computed
Terrain Clearance is 10,000 feet and the Radio Altitude is any
value (0-2500) then the Radio Altitude is considered unreasonable.
This is only performed if TAD is enabled, high
integrity terrain and position data is available (based on GPS/
Geometric Altitude), and the Computed Terrain Clearance is
greater than 4000 feet (2500 feet with version -218-218
or later).
Radio
Altitude
FLIGHT DECK
SPEAKERS AND
INTERPHONE
ALERT LAMPS
OR EFIS
DISPLAY
EFIS NAV.
DISPLAY OR Wx
RADAR
INDICATOR
AUDIO ALERT
MESSAGES
VISUAL ALERT
MESSAGES
TERRAIN DISPLAY
DATA
AIRCRAFT
PARAMETERS AIRCRAFT
SENSORS
AND
SYSTEMS
EGPWC
GPWS
ALGORITHMS
AURAL
CALLOUTS
TERRAIN
AWARENESS &
OBSTACLE
ALERTING AND
DISPLAY
ALGORITHMS
TERRAIN
CLEARANCE
FLOOR
ALGORITHMS
WINDSHEAR
DETECTION
AND ALERTING
ALGORITHMS
I
N
P
U
T
P
R
O
C
E
S
S
I
N
G
O
U
T
P
U
T
P
R
O
C
E
S
S
I
N
G
CONTROL/
DISCRETS
INPUTS
System
Inputs
060-4241-000 • Rev. E - December 2003
40 MK V & MK VII EGPWS Pilot Guide
Global
Positioning
System (GPS)
This feature reduces the potential for nuisance alerts caused by
false tracking of the Radio Altimeter.
Pitch and Roll Attitude, Latitude and Longitude Position, Body
Normal and Longitudinal Accelerations, Magnetic and True
Track Angles, Magnetic and True Heading, Inertial Altitude,
Groundspeed, and mode.
Latitude and Longitude Position, True Track Angle, GPS
Altitude, Groundspeed, Horizontal and Vertical Figure of Merit
(VFOM/HFOM), Horizontal and Vertical Dilution of Precision
(HDOP/VDOP), Horizontal Integrity Limit (HIL), and sensor
status. Note: Runway Awareness and Alerting System (RAAS)
function requires a GPS source capable of providing latitude
　
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