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* Red TERRAIN message on the ND
* Terrain display on both NDs if not selected on either one
(pop up function)
* Threat terrain on the ND changes from dots to a solid red
color.
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Terrain Functional Description
The GPWC I/O processes input signals selection and formats
the signals into the proper form for use by the GPWC.
The terrain processor function gets terrain data from the terrain
and airport databases to create a set of digital elevation matrix
overlays for use by the terrain threat detection and display
processor function. Data for the nearest runway is processed
for use by the terrain threat detection and display processor
functions for the terrain clearance floor function. This data
contains the length, runway center position, and altitude for the
nearest runway that is 3500 feet or longer and is hard surfaced.
The terrain threat detection and display processor function does
the threat analysis with the terrain data within calculated
caution and warning envelope boundaries below and forward of
the aircraft. The results of this threat assessment are combined
with background terrain data and the nearest runway data. This
information is formatted into a terrain display image which goes
to the terrain display output processor. When there is a terrain
caution or warning condition, an aural alert goes to the audio
output function.
The terrain display logic processes the display format data.
Inputs from the CDS system, weather radar, and the terrain
threat detection and display processor are used to determine
the scale and what information is to show. From the CDS
system, the terrain logic processor uses terrain select digital
discrete to select terrain to show on the DUs and range
selection data. The terrain display logic processor lets each
terrain display be scaled independently of each other. The
weather radar has alerts that may have a higher priority than
the GPWC. If there is a predictive windshear alert with a higher
priority than the GPWC, the windshear alert and display show.
Also, if the weather mode is selected for the captain and first
officer displays and a terrain alert is detected, the pop-up mode
will be enabled. This lets terrain alert information show
automatically on the DUs.
NOTE: If either captain or first officer display has terrain
selected, the pop up feature does not operate.
The terrain display output processor maintains a background
display of terrain forward of the aircraft. When a caution or
warning goes from the terrain threat detection and display
processor, the background image is enhanced to highlight the
terrain threat forward of the aircraft. The display scale is from
the terrain display logic function. The background data shows
as a variable density dot pattern in green, yellow, or red. The
density and color show how close the relative terrain is to the
aircraft altitude. The heading inputs are used to calculate the
radar-like sweep display ahead of the aircraft. The terrain data
goes out on two ARINC 453 data buses to the terrain/weather
relays. Alert displays go out on an ARINC 429 data bus to the
DEUs.
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EFFECTIVITY
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GPWS - ENHANCED FEATURES FUNCTIONAL DESCRIPTION
GPWS - ENHANCED FEATURES FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Description
Terrain clearance floor (TCF) alerts the flight crew when the
airplane descends too low on approach. TCF uses airplane
position and a runway database to find if there is an alert
condition.
Terrain Clearance Floor Inputs
The ground proximity warning system (GPWS) receives
airplane data from these systems:
　
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