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B757-200Aircraft Recur rent Training Manual - 4 -
Enhanced Ground Proximity Warning System component location
Figure 002 (sheet 1)
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 5 -
Enhanced Ground Proximity Warning System component
Figure 002 (sheet 2)
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 6 -
GPS Antenna For EGPWS
Figure 002 (sheet 3)
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 7 -
3. Operation (FIGURE 003)
A. Functional Description
(1) MODE 1 - EXCESSIVE DESCENT RATE
(a) Mode 1 provides audio and visual alerts for excessive descent rates into terrain.
When the EGPWS caution alert envelope is penetrated, the message “SINKRATE”
is enunciated and EGPWS alert lights illuminate. Continuing the excessive descent
rate into the EGPWS warning alert envelope results in a “PULL-UP” enunciation
and EGPWS alert lights illuminated. Mode 1 is desensitized to eliminate unwanted
(nuisance) alerts when the EGPWS determines that the aircraft is above a
Glideslope beam. In some applications, Mode 1 is also desensitized when Steep
Approach or Flap Override is active.
(2) MODE 2A/2B - TERRAIN CLOSURE RATE
(a) Mode 2 provides audio and visual alerts for dangerously high terrain closure rates.
Two sub-modes, referred to as Mode 2A and 2B, are defined. Mode 2A is active
when flaps are not in the landing position and the aircraft is not on an ILS approach
within ± 2 dots of glideslope center. Mode 2B is active when the flaps are in the
landing position or while on an ILS approach within ± 2 dots of glideslope deviation.
When the caution alert envelope is penetrated, the message “TERRAIN,
TERRAIN” is enunciated and EGPWS alert lights illuminate. Continuing the high
terrain closure rate into the warning alert envelope results in a “PULL-UP”
enunciation and EGPWS alert lights illuminated.
(3) MODE 3 - DESCENT AFTER TAKEOFF
(a) Mode 3 provides audio and visual alerts for excessive altitude loss after takeoff, or
after a go-around from below 245 feet above ground level (AGL), when flaps and
gear are not in the landing configuration. Penetrating the Mode 3 alert envelope
causes the voice message “DON’T SINK, DON’T SINK” and illumination of
EGPWS alerts lights.
(4) MODE 4A/4B/4C - UNSAFE TERRAIN CLEARANCE
(a) Mode 4 provides audio and visual alerts for unsafe terrain clearance with respect
to phase of flight, height above ground, and speed. Three sub-modes, referred to
as Mode 4A, 4B, and 4C, are defined. Mode 4A is active during cruise and
approach with landing gear up. Mode 4B is active during cruise and approach with
landing gear down and flaps up. Mode 4C is active during takeoff when either gear
or flaps are not in the landing configuration. The aural annunciations for Mode 4A
are “TOO LOW TERRAIN” or “TOO LOW GEAR” depending on airspeed. Mode 4B
provides “TOO LOW TERRAIN” or “TOO LOW FLAPS” depending on airspeed.
Mode 4C provides “TOO LOW TERRAIN”. EGPWS alert lights are illuminated
during these alerts.
(5) MODE 5 - DESCENT BELOW GLIDESLOPE
(a) Mode 5 provides audio and visual alerts for excessive glideslope deviation when
the aircraft descends below the glideslope beam on front-course ILS approaches.
Two levels of alerting are provided. If the aircraft is below 1000 feet AGL and gets
to or exceeds 1.3 dots glideslope deviation (fly-up), a ‘soft’ (reduced volume)
“GLIDESLOPE” is enunciated. Exceeding 2 dots below 300 feet AGL provides a
hard (full volume) “ GLIDESLOPE” enunciation. EGPWS alert lights are illuminated
during these alerts.
(6) MODE 6 - ADVISORY CALLOUTS
(a) The EGPWC can be programmed to enunciate Mode 6 Advisory Callouts based on
menu selectable options. Mode 6 includes Altitude Awareness,
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 8 -
ENHANCED GROUND PROXIMITY WARNING SYSTEM BLOCK DIAGRAM
Figure 003
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 9 -
Minimums/Approaching Minimums, and Bank Angle type callouts as defined for
each EGPWS model (refer to an applicable Interface Control Document or
Installation Design Guide). The menu selected Advisory Callouts are defined and
enabled in the installation configuration. If Altitude Callouts are not enabled, only
(DH based) “MINIMUMS” callouts will be provided. Only aural callouts are provided
　
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