Honeywell EGPWS MK VII - System Inputs

Mark V and Mark VII EGPWS Pilot’s Guide
System Description 060-4241-000
40 Rev H, August 2011
System
Inputs
The EGPWS uses various input signals from other on-board
systems. The full complement
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.
EGPWC
AUDIO ALERT
MESSAGES
AIRCRAFT
PARAMETERS
VISUAL ALERT
MESSAGES
TERRAIN DISPLAY
DATA AND VISUAL
ALERT MESSAGES
RASTER TEXT
GPWS
ALGORITHMS
TERRAIN
AWARENESS &
OBSTACLE
ALERTING AND
DISPLAY
ALGORITHMS
TERRAIN
CLEARANCE
FLOOR
ALGORITHMS
WINDSHEAR
DETECTION
AND ALERTING
ALGORITHMS
ALERT LAMPS
AND EFIS
DISPLAY
FLIGHT DECK
SPEAKERS AND
INTERPHONE
EFIS NAV
DISPLAY OR
Wx RADAR
INDICATOR
AIRCRAFT
SENSORS
AND
SYSTEMS
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
OPTIONAL NON-TSO
FUNCTIONS
• ALTITUDE CALLOUTS
• RUNWAY
AWARENESS
• APPROACH MONITOR
• ALTIMETER MONITOR
• TAKEOFF FLAP
MONITOR
• LONG LANDING
MONITOR
The EGPWS utilizes signals from the following systems:
Air Data
Uncorrected and corrected Barometric Altitude, Altitude rate,
Computed Airspeed, True Airspeed, and Static Air
Temperature are provided by Air Data system.
Radio
Altitude
Radio Altitude is provided by a Radio Altimeter system. Decision
Height or Decision Height Altitude is pro
vided 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.