Honeywell MK VI Manual

060-4314-000 • Rev. C - May 2004
MK VI & MK VIII EGPWS Pilot Guide
MK VI and MK VIII
Enhanced Ground Proximity Warning System (EGPWS)
Pilot's Guide

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Copyright 2004
Honeywell International Inc.
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This document and all information and expression contained herein
are the property of Honeywell International Inc. Your use of this
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constitutes acceptance of these terms.

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MK VI & MK VIII EGPWS Pilot Guide 3
TABLE OF CONTENTS
SECTION 1 Introduction ..............................................................................................4
SECTION 2 System Description ...................................................................................7
SECTION 3 Operational Procedures ..........................................................................46
SECTION 4 Definitions ..............................................................................................56
Request for Information .............................................................................................58

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4 MK VI & MK VIII EGPWS Pilot Guide
This Pilot Guide describes the functions and operation of the
MK VI and MK VIII Enhanced Ground Proximity Warning System
(EGPWS).
This document is divided into four sections. Section 1 is this
introduction and the following brief description of the EGPWS
and its features. Section 2 provides a functional description of
the EGPWS. This includes descriptions of the various system
modes, Built In Test (BIT) and monitoring functions, and system
features. Section 3 provides general operating procedures to fol-
low when the system gives a caution or warning alert. Section 4
provides definitions of terms used in this manual.
This guide does not supercede FAA approved data, Flight
Manuals, individual Operations Manuals, requirements,
or procedures. Pilots should be thoroughly familiar
with their own company policies, system configuration,
requirements, and procedures with respect to the op-
eration of aircraft with the EGPWS.
The information in this document is intended as a general expla-
nation of the Honeywell MK VI & MK VIII EGPWS. It contains a
general description of system performance assuming identified
options are active, and highlights deviations in system perfor-
mance resulting when a feature is disabled.
The EGPWS is a Terrain Awareness and Warning System (TAWS)
providing basic GPWS functions plus additional enhanced terrain
alerting and display features.
The EGPWS uses aircraft inputs including geographic position, at-
titude, altitude, airspeed, and glideslope deviation. These are used
with respect to internal terrain, obstacle, and airport databases
to predict a potential conflict between the aircraft flight path and
terrain or an obstacle. A conflict will result in the EGPWS provid-
ing a visual and audio caution or warning alert.
Additionally, the EGPWS provides alerts for excessive glideslope
deviation, too low with flaps or gear not in landing configuration,
and optionally provides bank angle and altitude callouts based on
system configuration selection.
SECTION 1
Introduction
What is the
EGPWS?

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MK VI & MK VIII EGPWS Pilot Guide
The EGPWS incorporates several “enhanced” features:
• Terrain Alerting and Display (TAD) function provides a
graphic display of the surrounding terrain on the Weather
Radar Indicator, EFIS, or a dedicated display. Based on the
aircraft’s GPS position and the internal database, the terrain
topography (within the display range selected) that is above
or within 2000 feet below the aircraft altitude is presented
on the system display. This feature is an option, enabled by
system configuration selection during installation.
• “Peaks” function is a TAD supplemental feature providing
additional terrain display features for enhanced situational
awareness, independent of the altitude of the aircraft. This
includes digital elevations for the highest and lowest dis-
played terrain, additional elevation (color) bands, and a
unique representation of sea level (0 feet MSL). This feature
is an option, enabled by system configuration selection dur-
ing installation for compatible display systems.
• “Obstacles” alerting function is a feature utilizing an
obstacle database for obstacle conflict alerting and display.
EGPWS visual and audio alerts are provided when a conflict
is detected. Additionally, when TAD is enabled, Obstacles
are graphically displayed similar to terrain. This feature is
an option, enabled by system configuration selection during
installation.
• A process feature called Envelope Modulation utilizes the
internal database to tailor EGPWS alerts at certain geographic
locations to reduce nuisance alerts and provide added pro-
tection.
Note: This feature is not available in the initial release
(-001) for the MK VI and MK VIII.
• A Terrain Clearance Floor (TCF) function adds an addi-
tional element of protection by alerting the pilot of possible
premature descent. This is intended for non-precision ap-
proach and is based on the current aircraft position relative
to the nearest runway in the database. This feature is en-
abled with the TAD function.
What is the
EGPWS?
continued

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6 MK VI & MK VIII EGPWS Pilot Guide
Physical
Description
• Similar to the TCF feature, a Runway Field Clearance Floor
(RFCF) feature provides alerting to the pilot of possible
premature descent based on the aircraft’s GPS position and
height above the destination runway using Geometric Alti-
tude. This provides improved protection at locations where
the destination runway is significantly higher than the sur-
rounding terrain.
• Geometric Altitude, based on GPS altitude, is a computed
pseudo-barometric altitude designed to reduce or elimi-
nate altitude errors resulting from temperature extremes,
non-standard pressure altitude conditions, flight in QFE en-
vironment, and altimeter miss-sets. This ensures an optimal
EGPWS alerting and display capability.
Some features are optional and may not be active in a given in-
stallation. For specific effectivity, refer to an applicable Airplane
Flight Manual (AFM) or EGPWS Airplane Flight Manual Supple-
ment (AFMS).
The MK VI/MK VIII EGPWS is packaged in a non-ARINC rack
mounted enclosure weighing less than 4 lbs. No special vibration
isolation or forced air-cooling is required.
Only 28 VDC versions of the EGPWS are available. Units are avail-
able with an internal GPS receiver for required GPS data when
another GPS source is not available.
For more detailed information, contact Honeywell.

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MK VI & MK VIII EGPWS Pilot Guide
SECTION 2
Enhanced Ground Proximity Warning System ..............................................................8
EGPWS Database ...........................................................................................................8
Basic Functions:
Mode 1 - Excessive Descent Rate ............................................................................... 10
Mode 2 - Excessive Closure to Terrain ....................................................................... 12
Mode 3 - Altitude Loss After Takeoff ............................................................................15
Mode 4 - Unsafe Terrain Clearance ............................................................................ 16
Mode 5 - Excessive Deviation Below Glideslope ....................................................... 21
Mode 6 - Advisory Callouts ........................................................................................ 22
Enhanced Functions:
Envelope Modulation ................................................................................................. 26
Terrain Clearance Floor ............................................................................................. 26
Runway Field Clearance Floor ....................................................................................28
Terrain Alerting and Display ........................................................................................29
Non-Peaks Display ......................................................................................................31
Pop-Up and Auto-Range .............................................................................................33
Peaks Display ..............................................................................................................33
TCF/TAD Inop and Inhibit ...........................................................................................38
Geometric Altitude ......................................................................................................38
Aural Message Priority ................................................................................................ 40
System Inputs ............................................................................................................41
System Outputs ..........................................................................................................43
Options .......................................................................................................................43

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8 MK VI & MK VIII EGPWS Pilot Guide
Enhanced
Ground
Proximity
Warning
System
EGPWS
Database
The EGPWS adds to these 6 basic functions the ability to compare
the aircraft position to an internal database and provide addi-
tional alerting and display capabilities for enhanced situational
awareness and safety (hence the term “Enhanced” GPWS).
The EGPWS internal database consists of four subsets:
• Terrain data of varying degrees of resolution.
• Cataloged obstacles 100 feet or greater in height located
within North America, portions of Europe and portions of Asia
(expanding as data is obtained).
• Airport runway data containing information on all runways
2000 feet or longer in length. This value is configurable as
3500 feet in the MK VIII in software load -008 or later. For a
specific list of the airports included, refer to Honeywell docu-
ment 060-4326-000, or 060-4267-000.
This can also be accessed on the Internet at www.egpws.com.
• An Envelope Modulation database to support the Envelope
Modulation feature described later. (This feature not available
in -001 release).
The MK VI EGPWS provides regional database coverage whereas
the MK VIII EGPWS provides a worldwide database . For the MK
VI, the database is divided into three regions referred to as the
Americas Region, Atlantic Region, and the Pacific Region.
The EGPWS incorporates the functions of the basic Ground
Proximity Warning System (GPWS). This includes the following
alerting modes:

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MK VI & MK VIII EGPWS Pilot Guide
EGPWS
Database
continued
Americas Region (4XXN)
Atlantic Region (4XXA)
Pacific Region (4XXP)
These regions are illustrated below.

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10 MK VI & MK VIII EGPWS Pilot Guide
EGPWS
Database
continued
MODE 1
Excessive
Descent
Rate
BASIC FUNCTIONS:
There is considerable overlap between the regions, particularly
Atlantic to Pacific, but once outside the installed database cover-
age area all enhanced functions dependent on the database are
inoperative.
Honeywell is constantly striving to improve the EGPWS database
in content, resolution, and accuracy. Notification of a Database
update is accomplished by Service bulletin. Database updates
are distributed on PCMCIA data cards and loaded via an external
PCMCIA interface unit called a Smart Cable that connects to a test
connector on the front panel of each EGPWS. Contact Honeywell
for additional information.
Because the overwhelming majority of “Controlled Flight Into
Terrain” (CFIT) accidents occur near an airport, and the fact
that aircraft operate in close proximity to terrain near an airport,
the terrain database contains higher resolution grids for airport
areas.
With the use of accurate GPS information, the EGPWS is provided
present position, altitude, track and ground speed. With this
information, the EGPWS is able to present a graphical plan view
of the aircraft relative to the terrain and advise the flight crew of
a potential conflict with the terrain or obstacle. Conflicts are rec-
ognized and alerts provided when terrain or an obstacle violates
specific computed envelope boundaries in the projected flight
path of the aircraft. Caution or warning alerts are provided in the
form of visual light annunciation, audio enunciation based on
the type of conflict, and color enhanced visual display of the ter-
rain or obstacle relative to the forward look of the aircraft. The
terrain display is provided on a Weather Radar Indicator, EFIS
display, or a dedicated EGPWS display and may or may not be
displayed automatically.
The following sections provide functional descriptions of the
EGPWS basic and enhanced functions and features, and system
input and output requirements.
Mode 1 provides alerts for excessive descent rates with respect to
altitude AGL and is active for all phases of flight. This mode has
inner and outer alert boundaries as illustrated in the diagram
and graphs on the next page.

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MK VI & MK VIII EGPWS Pilot Guide
MODE 1
Excessive
Descent
Rate
continued
Excessive Descent Rate turboprop
Excessive Descent Rate turbofan (jet)
Penetration of the outer boundary activates the EGPWS
caution lights and “SINKRATE, SINKRATE” alert enunciation.
Additional “SINKRATE, SINKRATE ” messages will occur for
each 20% additional penetration of the outer boundary.
Penetration of the inner boundary activates the EGPWS warning
lights and changes the audio message to “PULL UP” which re-
peats continuously until the inner warning boundary is exited.
Radio Altitude (FEET)
Descent Rate (FEET/MINUTE)
3000
2500
2000
1500
1000
500
0
2000 4000 6000 8000 10000
"SINKRATE"
"PULL UP!"
0
"SINKRATE"
"PULLUP"
"SINKRATE SINKRATE"
"PULL UP"

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12 MK VI & MK VIII EGPWS Pilot Guide
MODE 2
Excessive
Closure to
Terrain
MODE 2A
Steep
Approach
Bias
Glideslope
Deviation
Bias
Flap
Override
Bias
If a valid ILS Glideslope front course is received and the aircraft
is above the glideslope centerline, the outer (sinkrate) boundary
is adjusted to desensitize the sinkrate alerting. This is to prevent
unwanted alerts when the aircraft is safely capturing the glides-
lope (or repositioning to the centerline) from above the beam.
The EGPWS offers a Steep Approach option that desensitizes the
alert boundaries to permit steeper than normal approaches (e.g.,
MLS or GPS) without unwanted alerts.
When flap override is selected, the alert boundaries are
desensitized to permit higher descent rates as the result of flaps
in a non-landing configuration. This bias is smaller than the
steep approach bias.
Mode 2 provides alerts to help protect the aircraft from impacting
the ground when rapidly rising terrain with respect to the aircraft
is detected. Mode 2 is based on Radio Altitude and on how
rapidly Radio Altitude is decreasing (closure rate). Mode 2 exists
in two forms, 2A and 2B.
Mode 2A is active during climbout, cruise, and initial approach
(flaps not in the landing configuration and the aircraft not on
glideslope centerline). If the aircraft penetrates the Mode 2A
caution envelope, the aural message “TERRAIN, TERRAIN” is
generated and cockpit EGPWS caution lights will illuminate. If
the aircraft continues to penetrate the envelope, the EGPWS
warning lights will illuminate and the aural warning message
“PULL UP” is repeated continuously until the warning envelope
is exited. Upon exiting the warning envelope, if terrain clearance
continues to decrease, the aural message “TERRAIN” will be
given until the terrain clearance stops decreasing. In addition,
the visual alert will remain on until the aircraft has gained 300
feet of altitude, 45 seconds has elapsed, or landing flaps or the
flap override switch is activated.
The following graph shows how the upper boundary of the Mode
2 alert envelope varies as a function of the aircraft speed. Two
aircraft speed ranges are defined; 220 knots to 310 knots for
faster aircraft, and 190 to 280 knots for slower aircraft (selected
for the aircraft configuration at installation). The boundary
expansion provides increased alert times at the higher airspeeds.

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MK VI & MK VIII EGPWS Pilot Guide
MODE 2B
MODE 2A
Continued
The Mode 2A upper limit is reduced to 1250 feet (950 feet with
version -022 and later) for all airspeeds when the Terrain Alert-
ing and Display function is enabled and available. This is due
to the enhanced alerting capability provided with TAD, resulting
from high integrity GPS Altitude and Geometric Altitude data. The
Mode 2A envelope is lowered in order to reduce the potential for
nuisance alerts during an approach.
Mode 2B provides a desensitized alerting envelope to permit
normal landing approach maneuvers close to terrain without
unwanted alerts. Mode 2B is automatically selected with flaps in
the landing configuration (landing flaps or flap Override selected)
or when making an ILS approach with Glideslope and Localizer
deviation less than 2 dots. It is also active during the first 60 sec-
onds after takeoff.
Mode 2B is selected when the aircraft is within 5nm (10nm with
version -022 and later) and 3500 feet of the destination airport
(independent of configuration) and the Terrain Alerting and Dis-
play (TAD) function is enabled and available. This is due to the
enhanced alerting capability provided with TAD, resulting from high

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14 MK VI & MK VIII EGPWS Pilot Guide
MODE 2B
Continued
integrity GPS Altitude and Geometric Altitude data. The Mode 2B
envelope is selected in order to reduce the potential for nuisance
alerts during an approach.
During an approach, if the aircraft penetrates the Mode 2B enve-
lope with either the gear or flaps not in the landing configuration,
the aural message “TERRAIN, TERRAIN” is generated and the
EGPWS caution lights illuminate. If the aircraft continues to
penetrate the envelope, the EGPWS warning lights illuminate and
the aural message “PULL UP” is repeated continuously until the
warning envelope is exited. If the aircraft penetrates the Mode 2B
envelope with both gear and flaps in the landing configuration,
the aural “PULL UP” messages are suppressed and the aural
message “TERRAIN” is repeated until the envelope is exited.
The graph below shows the Mode 2B envelope.

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MK VI & MK VIII EGPWS Pilot Guide 15
MODE 3
Altitude
Loss After
TakeOff
Altitude loss after takeoff turboprop
Altitude loss after takeoff turbofan (jet)
Mode 3 provides alerts for significant altitude loss after takeoff
or low altitude go-around (less than 245* feet AGL) with gear or
flaps not in the landing configuration. The amount of altitude
loss that is permitted before an alert is given is a function of the
height of the aircraft above the terrain as shown below. This pro-
tection is available until the EGPWS determines that the aircraft
has gained sufficient altitude that it is no longer in the takeoff
phase of flight. Significant altitude loss after takeoff or during a
low altitude go-around activates the EGPWS caution lights and the
aural message “DON’T SINK, DON’T SINK”.
*245 feet if bizjet
170 feet if 170' Mode 4B is
selected
150 feet if 150' Mode 4B is
selected

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16 MK VI & MK VIII EGPWS Pilot Guide
MODE 3
Continued
MODE 4
Unsafe
Terrain
Clearance
The aural message is only enunciated twice unless altitude loss
continues. Upon establishing a positive rate of climb, the EGPWS
caution lights extinguish and the aural alert will cease.
Selecting flap override on turboprop aircraft increases the al-
lowable altitude loss, enabling optional pattern work without
unwanted warnings.
Mode 4 provides alerts for insufficient terrain clearance with re-
spect to phase of flight, configuration, and speed. Mode 4 exists
in three forms, 4A, 4B, and 4C.
• Mode 4A is active during cruise and approach with the gear
not in the landing configuration.
• Mode 4B is active during cruise and approach with the gear
in the landing configuration and flaps not in the landing con-
figuration.
• Mode 4C is active during the takeoff phase of flight with either
the gear or flaps not in the landing configuration.
Mode 4 alerts activate EGPWS caution lights and aural messages.
For turbofan (bizjet) aircraft, to reduce nuisance alerts caused
by overflying another aircraft, the upper limit of the airspeed ex-
pansion portion of the Mode 4A/B alerting curve can be reduced
(from 1000) to 800 feet. This occurs if the installation identifies
an airplane type providing the 1000 foot upper limit and the
airplane is above 250 knots with gear and flaps not in landing
configuration and a sudden change in Radio Altitude is detected.
This is intended to eliminate nuisance alerts while flying a hold-
ing pattern and an aircraft overflight occurs (with 1000 foot
separation).
Mode 4 airspeed expansion is disabled (upper limit held at low-
est airspeed limit) when the Terrain Alerting and Display (TAD)
function is enabled and available. This is due to the enhanced
alerting capability provided with TAD, resulting from high integrity
GPS and Geometric Altitude data. This change to the Mode 4 en-
velopes further reduces the potential for nuisance alerts when the
aircraft is not in the landing configuration.
Several Mode 4 alert envelope variations are defined as an option
in the installation configuration. In the following Mode 4 discus-
sions, the most common limits are provided with the alternates
identified in parenthesis. For a specific application, refer to the
installation documentation to obtain the defined configuration.

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MK VI & MK VIII EGPWS Pilot Guide 17
Unsafe terrain clearance gear up turboprop
MODE 4A
Mode 4A is active during cruise and approach with gear up. This
provides alerting during cruise for inadvertent flight into ter-
rain where terrain is not rising significantly, or the aircraft is not
descending excessively. It also provides alerting for protection
against an unintentional gear-up landing.
The standard boundary for Mode 4A is at 500 feet AGL. Penetra-
tion of this altitude below an airspeed of 178 knots will produce
an aural alert of “TOO LOW GEAR“. The airspeed limit is 148
knots if the alternate airspeed configuration has been selected,
and it is 190 knots for turbofan (bizjet) aircraft.
Above 178 knots, the boundary increases linearly with airspeed
to a maximum of 750 feet AGL at 200 knots to produce a “TOO
LOW TERRAIN” aural alert. If the alternate airspeed configura-
tion has been selected, the slope begins at 148 knots and ends at
170 knots and 1000 feet AGL. For turbofan (bizjet) aircraft, the
slope begins at 190 knots and ends at 250 knots and 1000 feet
AGL. (See following graphs)
For any Mode 4A alert, subsequent aural messages occur only if
penetration of the envelope increases by 20%. EGPWS alert lights
extinguish and aural messages cease when the Mode 4A alert
envelope is exited.

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18 MK VI & MK VIII EGPWS Pilot Guide
MODE 4B
Unsafe terrain clearance gear up turbofan (Jets)
MODE 4A
Continued
During Marginal performance go around (gear down then
brought up without a landing) or extended gear up approach
(gear up and either Flap Override on or flaps down) the MK VI/
VIII EGPWS is designed to delay Mode 4A "TOO LOW GEAR" alerts
until the Mode 4B curve is penetrated.
Mode 4B is active during cruise and approach with gear down
and flaps not in the landing configuration.
The standard boundary for Mode 4B is at 170 feet AGL. Penetra-
tion of this altitude below an airspeed of 150 knots will produce
an aural alert of “TOO LOW FLAPS“. If the alternate airspeed
configuration has been selected, the boundary is 200 feet AGL
and the airspeed limit is 148 knots. For turbofan (bizjet) aircraft,
the boundary is 245 feet AGL and its airspeed limit is 159 knots.
Above 150 knots, the boundary increases linearly with airspeed
to a maximum of 750 feet AGL at 200 knots to produce a “TOO
LOW TERRAIN” aural alert. If the alternate airspeed configura-
tion has been selected, the slope begins at 148 knots and ends at
200 knots and 1000 feet AGL. For turbofan (bizjet) aircraft, the
slope begins at 159 knots and ends at 250 knots and 1000 feet
AGL. (See following graphs)

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MK VI & MK VIII EGPWS Pilot Guide 19
Unsafe terrain clearance gear down turbprop
Unsafe terrain clearance gear down turbofan (jet)
MODE 4C
If the aircraft radio altitude decreases to the value of the
Minimum Terrain Clearance (MTC), the EGPWS caution light
illuminates and the aural message “TOO LOW TERRAIN” is
enunciated.
If desired, the pilot may disable the “TOO LOW FLAPS” alert by
engaging the Flap Override switch (if installed). This precludes
or silences the Mode 4B flap alert until reset by the pilot.
For any Mode 4B alert, subsequent aural messages occur only if
penetration of the envelope increases by 20%. EGPWS alert lights
extinguish and aural messages cease when the Mode 4B alert
envelope is exited.
The Mode 4C alert is intended to prevent inadvertent controlled
flight into the ground during takeoff climb into terrain that pro-
duces insufficient closure rate for a Mode 2 alert. After takeoff,
Mode 4A and 4B provide this protection.
MODE 4B
Continued

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20 MK VI & MK VIII EGPWS Pilot Guide
MODE 4C
Continued
Unsafe terrain clearance takeoff turboprop
Unsafe terrain clearance takeoff turbofan (Jet)
Mode 4C is based on an EGPWS computed MTC floor, that in-
creases with Radio Altitude. It is active after takeoff when the
gear or flaps are not in the landing configuration. It is also active
during a low altitude go-around if the aircraft has descended be-
low 245* feet AGL.
*245 feet if bizjet
170 feet if 170' Mode 4B
is selected
150 feet if 150' Mode 4B
is selected
At takeoff, the MTC is zero feet. As the aircraft ascends, the MTC
is increased to 75% of the aircraft’s Radio Altitude (averaged over
the previous 15 seconds). This value is not allowed to decrease
and is limited to the same values as the Mode 4A curve. If the
aircraft radio altitude decreases to the value of the MTC, the EG-
PWS caution light illuminates and the aural message "TOO LOW
TERRAIN" is enunciated. The EGPWS caution lights extinguish
and aural messages cease when the Mode 4C alert envelope is
exited.