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System Inputs - Honeywell EGPWS MK V Pilot's Manual

Enhanced ground proximity warning system
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Table of Contents
System
The EGPWS uses various input signals from other on-board
systems. The full complement of these other systems is
Inputs
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:
Air Data
Uncorrected and corrected Barometric Altitude, Altitude rate,
Computed
Temperature are provided by Air Data system.
Radio
Radio Altitude is provided by a Radio Altimeter system. Decision
Height or Decision Height Altitude is provided by a Radio
Altitude
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.
System Description
40
AIRCRAFT
AIRCRAFT
PARAMETERS
SENSORS
AND
SYSTEMS
Airspeed,
Mark V and Mark VII EGPWS Pilot's Guide
AUDIO ALERT
GPWS
ALGORITHMS
TERRAIN
AWARENESS &
OBSTACLE
O
ALERTING AND
I
U
DISPLAY
N
T
ALGORITHMS
P
P
U
VISUAL ALERT
U
TERRAIN
T
T
CLEARANCE
FLOOR
P
P
ALGORITHMS
R
R
O
O
C
WINDSHEAR
C
E
DETECTION
E
S
AND ALERTING
S
S
ALGORITHMS
S
I
I
N
N
G
OPTIONAL NON-TSO
TERRAIN DISPLAY
G
FUNCTIONS
DATA AND VISUAL
ALERT MESSAGES
• ALTITUDE CALLOUTS
• RUNWAY
AWARENESS
• APPROACH MONITOR
• ALTIMETER MONITOR
• TAKEOFF FLAP
MONITOR
• LONG LANDING
MONITOR
EGPWC
True
Airspeed,
FLIGHT DECK
MESSAGES
SPEAKERS AND
INTERPHONE
ALERT LAMPS
MESSAGES
AND EFIS
DISPLAY
EFIS NAV
RASTER TEXT
DISPLAY OR
Wx RADAR
INDICATOR
and
Static Air
060-4241-000
Rev H, August 2011

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