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rapidly change to a loss in airspeed and lift. The airplane
altitude now rapidly decreases.
For mode 7 warnings, the GPWC gives the aural message
WINDSHEAR WINDSHEAR WINDSHEAR with a siren. The
GPWC sends a discrete to the DEUs to make the red
WINDSHEAR message show on the primary flight displays.
Mode 7 warnings have the highest priority.
GPWS - MODE 7 DESCRIPTION
EFFECTIVITY
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GPWS - MODE 7 DESCRIPTION
GPWS - MODE 7 DESCRIPTION
EFFECTIVITY
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General
These LRUs supply data for mode 7 operation:
* Radio altimeter 1 AND 2
* Left and right ADIRUs
* Stall management yaw damper 1 and 2.
The GPWC uses this data to detect windshear:
* Radio altitude
* Inertial vertical speed
* Pitch and roll angle
* Pitch rate
* Longitudinal acceleration
* Normal acceleration
* Vertical acceleration
* Indicated angle of attack (AOA)
* Corrected AOA
* Stick shaker AOA
* Flap angle
* Minimum operating speed
* True airspeed
* Computed airspeed.
When there is an windshear condition, the mode detector sends
a discrete to the speech prom to make the aural message. The
aural message goes to the remote electronic unit (REU) which
sends it to the flight compartment.
When the GPWC gives an aural message, a discrete goes to the
TCAS computer to inhibit TCAS aural messages and
downgrade TCAS resolution advisories to traffic alerts.
The mode detector also sends a discrete on the ARINC 429 data
bus to the DEUs to show the WINDSHEAR message on the
primary flight display (PFD).
GPWS - MODE 7 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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GPWS - MODE 7 FUNCTIONAL DESCRIPTION
GPWS - MODE 7 FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The ground proximity warning computer compares the airplane
position, flap and gear position, and terrain clearance to find if
an alert or warning condition exists.
Terrain Awareness Inputs
The GPWC receives inputs from these systems for the terrain
awareness function:
* GPS 1
* GPS 2
* ADIRU L
* ADIRU R
* CDS
* Landing gear switch module
* Weather Radar.
Aircraft position from the GPS 1 system is the primary input. If
GPS 1 position is not valid, GPS 2 position is used. ADIRU
position can be used for short periods of time when neither GPS
1 or 2 position is not valid.
Terrain Awareness Calculation
The GPWC has a world-wide terrain database in memory. The
GPWC compares airplane position and track to the terrain
database. If the GPWC finds there is a terrain threat, it makes an
alert.
Terrain Display Output
The GPWC makes a digital map of the terrain forward of the
airplane. It sends this digital map to the display electronics units
(DEUs) to show on the navigational displays (NDs). The display
uses different colored dots to show terrain altitude relative to
airplane altitude.
Terrain Alert Outputs
If the GPWC finds the airplane is 60 seconds from a terrain
conflict, it makes a terrain caution alert. These are the caution
alert indications:
* Alert aural message, CAUTION TERRAIN
* Amber message, TERRAIN on the ND
* Terrain display on both NDs (pop up function)
* Threat terrain on the ND changes from dots to a solid yellow
color.
If the GPWC finds the airplane is 30 seconds from a terrain
conflict, it makes a terrain warning alert. These are the warning
alert indications:
* Aural message, TERRAIN, TERRAIN PULL UP
* Red PULL UP message on the PFD
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