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(fine) and Longitude (fine) data.
Glideslope, Localizer, ILS Tuned, Selected Runway
Heading.
Display range, and if available the Hazard Bus from a Predictive
Windshear System (PWS). If EFIS, the EFIS display mode is
used in some configurations.
AOA, Stick Shaker Margin.
Discrete inputs are used for system configuration, signal/status
input, and control input functions.
EGPWS program pins are utilized to tell the system the type of
aircraft and interface that it is in. These are defined and
established during the EGPWS installation. EGPWS output
functions are consequently the result of the program pin state
read each time the EGPWS is powered on.
Signal/status discretes include signals such as Decision Height,
Landing Flaps selected or Flap Position discretes, Landing Gear
selected, Terrain Display Range, and status discretes such as
Glideslope Valid, Localizer Valid, Radio Altitude Valid
associated with analog signal inputs.
Control discretes control EGPWS functions. These include
EGPWS Test, Glideslope Cancel, Glideslope Inhibit or
Glideslope Backcourse, Terrain (display) select, Terrain
Inhibit, Flap Override, Audio Inhibit, Altitude Callout Enable,
Steep Approach Enable, and ILS Tuned discretes.
VHF Nav
Reciever
Terrain Display
System
Discretes
AOA Vane or
Stall Warning
FMS, IRS,
AHRS, Accelerometer
Radio
Altitude
continued
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 41
The EGPWS provides both audio and visual outputs.
Audio outputs are provided as specific alert phrases, and
altitude callouts or tones provided by an EGPWS speaker and
via the cockpit Interphone system for headset usage. Several
audio output levels are available. They are established during
the installation of the EGPWS. These EGPWS audio outputs can
be inhibited by other systems having higher priority (i.e.,
windshear) or cockpit switches in some cases. The EGPWS
also has the ability to inhibit other system audio outputs such
as TCAS.
Visual outputs provide discrete alert and status annunciations,
and display terrain video when a compatible display system is
available and enabled. The discrete visual alerts coincide with
audio caution and warning alerts to achieve an optimum
terrain alerting capability. Status annunciations provide
information to the flight crew about the status of the EGPWS
(e.g., GPWS INOP) or activation of selected functions. Terrain
video is generated by the EGPWC based on the aircraft’s current
position relative to the surrounding terrain. This video is
presented to a Weather Radar indicator, EFIS display, or a
dedicated display unit.
The EGPWC uses program pin discrete inputs (or software
upgrade - RAAS only) to define the installation configuration
and option selection. The EGPWS has been designed for maximum
flexibility while being tailored to specific aircraft
equipment, sensors, and displays. The following list summarizes
available Operator options (excluding sensor and
equipment configuration options):
• RAAS – Provides audio-only advisories of position during
ground operations and approach to landing.
• Flashing Lamps – When selected causes alert annunciators
to flash when active.
• TAD and TCF Disable – Suppresses all TAD and TCF
alerting and display functions.
• Altitude Callouts – Selects desired altitude callouts from
a menu of options.
• Audio Output Level – Selects desired audio output level
High, Medium, or Low.
• Alternate Mode 6 Volume – Selects reduced Mode 6
volume (-3 dB).
Options
System
Outputs
060-4241-000 • Rev. E - December 2003
42 MK V & MK VII EGPWS Pilot Guide
• Obstacle Awareness Enabled – Enables obstacle alerting
and display.
• TAD Alternate Pop Up – If TRUE, disables (or enables)
automatic terrain display when TAD or Obstacle alert is active,
dependent on aircraft/display type.
• Mode 6 Volume Reduction – Selects reduced Mode 6
volume (-6 dB).
• Smart Callout Enable – Enables the 500-foot smart
callout. “Five Hundred” is called out at 500 feet Radio Altitude
during non-precision approaches. If 500’ is part of the
altitude callout option selected, this callout is not given on
precision approaches.
• Bank Angle Enable – Enables Bank Angle alerts.
• Windshear Caution Voice Disable – Disables Windshear
Caution voice alerts providing visual alerts only.
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