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feature except that RFCF is based on the current aircraft
position and height above the destination runway based on
Geometric Altitude (see next page). This provides improved
protection at locations where the destination runway
is significantly higher than the surrounding terrain.
What is the
EGPWS?
continued
060-4241-000 • Rev. E - December 2003
4 MK V & MK VII EGPWS Pilot Guide
Physical
Description
• An Aural Declutter feature reduces the repetition of warning
messages. This feature is optional, and may be disabled
by system program pins during installation.
• Geometric Altitude, based on GPS altitude, is a computed
pseudo-barometric altitude designed to reduce or eliminate
altitude errors resulting from temperature extremes, nonstandard
pressure altitude conditions, and altimeter
miss-sets. This ensures an optimal EGPWS alerting and display
capability.
• Runway Alerting & Advisory System (RAAS)
The EGPWS also provides position awareness advisories
relative to runways during ground operations and
approach to land. This new feature is known as
"Runway Awareness and Advisory System" - RAAS (only
available in -218-218 or later versions).
Some of these features have been added to the EGPWS as the
system evolved and are not present in all Enhanced Ground
Proximity Warning Computer (EGPWC) part numbers. For specific
effectivity, refer to an applicable Airplane Flight Manual
(AFM) or EGPWS Airplane Flight Manual Supplement (AFMS) or
contact Honeywell for assistance.
The EGPWC is packaged in a 2 MCU ARINC 600-6 rack mounted
enclosure weighing less than 8 lbs. No special vibration isolation
mounting or forced air-cooling is required.
115 VAC (400 Hz.) or 28 VDC versions of the EGPWC are available.
Units are also available with an internal GPS receiver for
required GPS data when another GPS source is not available.
For more detailed descriptions and information, contact
Honeywell.
What is the
EGPWS?
continued
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 5
SECTION 2
System Description
Enhanced Ground Proximity Warning System ............................. 6
EGPWS Database ................................................................................. 6
Basic Functions:
Mode 1 - Excessive Descent Rate ....................................................... 8
Mode 2 - Excessive Closure to Terrain ................................................ 9
Mode 3 - Altitude Loss After Takeoff .................................................. 12
Mode 4 - Unsafe Terrain Clearance .................................................. 13
Mode 5 - Excessive Deviation Below Glideslope ................................. 17
Mode 6 - Advisory Callouts ............................................................... 19
Mode 7 - Windshear Alerting............................................................. 23
Enhanced Functions:
Envelope Modulation ........................................................................ 25
Terrain Clearance Floor .................................................................... 25
Runway Field Clearance Floor ............................................................ 27
Terrain Look Ahead Alerting .............................................................. 27
Terrain Alerting and Display .............................................................. 29
Non-Peaks Display ............................................................................. 30
Pop-Up and Auto-Range .................................................................... 32
Peaks Display .................................................................................... 32
Geometric Altitude ............................................................................ 36
Weather Radar Auto-Tilt ..................................................................... 37
Aural Message Priority ..................................................................... 37
System Inputs ................................................................................. 39
System Outputs .............................................................................. 41
Options ........................................................................................... 41
060-4241-000 • Rev. E - December 2003
6 MK V & MK VII EGPWS Pilot Guide
Enhanced
Ground
Proximity
Warning
System
The EGPWS incorporates the functions of the basic Ground
Proximity Warning System (GPWS). This includes the following
alerting modes:
Additionally, Windshear alerting (Mode 7) is provided for specific
　
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