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* Aural message, TOO LOW TERRAIN.
* Message, TERRAIN on the ND in amber.
If descent continues, these alerts happen:
GPWS - RUNWAY FIELD CLEARANCE FLOOR
EFFECTIVITY
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* Aural message, PULL UP
* Message, TERRAIN on the ND in red
* Message, PULL UP on the PFD.
The GPWC inhibits RFCF alerts for any of these conditions:
* Airplane is on the ground
* Less than 20 seconds after takeoff
* Less than 30 feet radio altitude.
GPWS - RUNWAY FIELD CLEARANCE FLOOR
EFFECTIVITY
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GPWS - RUNWAY FIELD CLEARANCE FLOOR
GPWS - RUNWAY FIELD CLEARANCE FLOOR
EFFECTIVITY
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General
The audio generator supplies aural messages for modes 1
through 7, TA, and TCF. The audio generator also contains
callouts for:
* Selected radio altitudes
* Radio minimums
* Bank angle
* V1.
Description
The audio generator sends only one message at a time to the
audio amplifier. If more than one message discrete comes from
the mode detector, the audio generator sends the message that
has the highest priority. This makes sure only one message is
sent at a time. From the audio amplifier, the audio goes to the
remote electronics unit and on to the flight compartment
speakers and headphones. Some remote electronics units have
an AURAL WARN MUTE switch that can inhibit audio to the
headphones. Warnings and cautions also go to the flight data
acquisition unit for recording. There are hundreds of words
necessary for the annunciation of all the possible BITE, caution,
and warning messages. The graphic shows the possible GPWS
modes with the caution and warning aural messages and their
priority.
The audio generator gets inputs for message requests and
volume levels from the mode logic detector. The test circuit
gives an input for annunciation of all BITE information.
GPWS - SPEECH PROM
EFFECTIVITY
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GPWS - SPEECH PROM
GPWS - SPEECH PROM
EFFECTIVITY
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Purpose
Some airports have unusual terrain clearances near the
runway that cause nuisance messages by the GPWS. The
most common is a mode 2 warning for an excessive closure
rate due to rising terrain located at the end of a runway. Other
GPWS modes affected by unusual terrain are modes 1, 4, and 5.
Envelope modulation changes the different alert and warning
areas to prevent alert messages that are not necessary.
Description
The airports that need envelope modulation are in the GPWC
non-volatile memory and identified by their latitude and
longitude. This latitude and longitude is called a snapshot
area. A snapshot area is then followed, on an approach, by the
envelope modulation area. The envelope modulation area has
its own latitude and longitude. When the airplane is in a
snapshot area, the GPWC looks at other airplane parameters to
ensure that all the required data is valid and within tolerances.
Once the snapshot requirements have been verified by the
GPWC, and depending on which airport the airplane is
approaching, one or more of the listed GPWS modes can be
modified.
* Mode 1 - to allow higher altitude descent rates
* Mode 2(A and B) - to allow higher closure rates
* Mode 4 - to allow less minimum terrain clearance
* Mode 5 - to allow GLIDE SLOPE warnings at higher altitudes.
Not all airports require The same parameters. These are the
monitored inputs:
* Latitude
* Longitude
* Radio altitude
* Localizer deviation
* Magnetic track
* Selected runway heading
* Barometric corrected altitude.
GPWS - ENVELOPE MODULATION
EFFECTIVITY
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