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GPWS - ENVELOPE MODULATION
GPWS - ENVELOPE MODULATION
EFFECTIVITY
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GPWS - ENVELOPE MODULATION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CDS Warning Annunciations
The common display system (CDS) can show these two
warning annunciations in the GPWS message field on the AI
display:
* PULL UP (red)
* WINDSHEAR (red).
The PULL UP warning annunciation shows for mode 1, 2, 3 and
4 conditions. The WINDSHEAR warning annunciation shows for
a mode 7 condition.
Below G/S Switch/Light
There are two BELOW G/S Switch/Lights. One for the captain
and one for the first officer. The switch/lights are amber and
come on for mode 5 alerts. The Below G/S Switch/Light can be
pushed to stop the alert. This will also cancel the aural warning.
Ground Proximity INOP Light
The INOP light on the ground proximity warning module comes
on for these conditions:
* GPWS inoperative
* Windshear inoperative.
Each of these conditions has inputs that are used to determine
whether to turn the INOP light on or off. The inputs change when
the aircraft is in the air mode or ground mode. These are the
inputs for each condition and mode.
GPWS inop in air:
* SMYD
* ADIRU
* RA
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* ILS
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* Program pin error
* Flap position error
* Air ground error
* Mode failure.
GPWS inop on ground:
* SMYD
* ADIRU
* RA
* DEU
* ILS
* Program pin error
* Flap position error
* Air ground error
* Mode failure.
Altitude callouts inop in air:
* DEU
* ADIRU
* RA
* Invalid altitude callout selection.
GPWS - DISPLAYS
EFFECTIVITY
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Altitude callouts inop on ground:
* DEU
* ADIRU (air data)
* RA
* Invalid altitude callout selection.
Windshear inop in air:
* RA
* ADIRU
* SMYD
* DEU
* Program pin error
Windshear inop on ground:
* RA
* ADIRU
* SMYD
* Program pin error.
NOTE: ADIRU in the attitude mode will not cause the
windshear to be inop in air.
GPWS - DISPLAYS
EFFECTIVITY
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GPWS - DISPLAYS
GPWS - DISPLAYS
EFFECTIVITY
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Terrain Awareness Display Data
The navigation displays (NDs) show this GPWS data:
* Terrain awareness display
* Vertical situation display
* GPWS system messages
* GPWS alert messages.
Terrain Awareness Display
The terrain awareness display on the NDs uses dots to show
the terrain ahead of the airplane. Dot color and dot pattern
density are based on the terrain altitude and airplane altitude.
These are the dot colors and patterns the terrain display uses:
* High density red - Terrain more than 2,000 feet above
airplane altitude
* High density yellow - Terrain 1,000 feet to 2,000 feet above
airplane altitude
* Medium density yellow - Terrain 500 feet below to 1,000 feet
above airplane altitude. Gear down changes this to 500 feet
below to 250 feet above
* Medium density green - Terrain 500 feet below to 1,000 feet
below airplane altitude. Gear down changes this to 500 feet
below to 250 feet below
* Low density green - Terrain 1,000 feet below to 2,000 feet
below airplane altitude
* Black - Terrain more than 2,000 feet below airplane altitude
* Magenta - Unknown terrain.
If GPWS detects a terrain caution alert, the threat terrain
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