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for Mode 6. EGPWS alert lights are NOT illuminated for Mode 6 callouts. The
following table identifies the Mode 6 Callouts that are available for the configuration
we select.
TABLE 2-1: MODE 6 CALLOUTS
CALLOUT DESCRIPTION
“MINIMUMS” At descent below minimums setting (DH)
“FIVE HUNDRED” At descent below 500 feet
“ONE HUNDRED” At descent below 100 feet
“FIFTY” At descent below 50 feet
“FOURTY” At descent below 40 feet
“THIRTY” At descent below 30 feet
“TWENTY” At descent below 20 feet
“TEN“ At descent below 10 feet
(b) EXCESSIVE BANK ANGLE CALLOUT
The Bank Angle Callout feature provides callout enunciation for excessive bank
angles based on altitude and bank angle limits defined by aircraft type. It is
intended to enhance situational awareness during intentional or unintentional
maneuvering, and for protection against wing or engine strikes when close to the
runway. When the bank angle limit is reached, the aural callout “BANK ANGLE,
BANK ANGLE” is given. Follow-on aural messages are only provided when the
aircraft roll angle increases an additional 20% from the previous callout. Bank
Angle Callouts are enabled by the installation configuration.
(7) MODE 7 - WINDSHEAR DETECTION （Not Enabled）
(a) Mode 7 provides the flight crew with visual and aural alerts for windshear of
sufficient magnitude to be potentially hazardous to the aircraft. The system is
capable of detecting severe decreasing performance shears (i.e. increasing
tailwind/ decreasing headwind and/or downdraft), which present an immediate
danger to the aircraft. The system is also capable of detecting severe increasing
performance shears (increasing headwind/decreasing tailwind and/or up draft).
While these shears may not present an immediate danger to the aircraft, these
shears can indicate that the atmospheric instability is such that an encounter with a
severe decreasing performance shear is likely. A detected increasing performance
shear will result in an aural “CAUTION WINDSHEAR” enunciation and cockpit light
annunciation when enabled. A detected decreasing performance shear will result
in an aural siren followed by “WINDSHEAR, WINDSHEAR, WINDSHEAR” with a
corresponding cockpit warning light annunciation.
(8) ENVELOPE MODULATION
(a) Envelope Modulation provides improved alert protection and expanded alerting
margins at identified key locations throughout the world. Due to terrain features at
or near certain specific airports, normal operations have resulted in nuisance or
missed alerts at these locations in the past. With the introduction of accurate
position information and a terrain and airport database, it is now possible to identify
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 10 -
these areas and adjust the normal alerting process to compensate for the
condition.
(b) Modes 4, 5, and 6 are expanded at certain locations to provide alerting protection
consistent with normal approaches. Modes 1, 2, and 4 are desensitized at other
locations to prevent nuisance alerts that result from unusual terrain or approach
procedures. In all cases, very specific information is used to correlate the aircraft
position and phase of flight prior to modulating the envelopes. This function is
automatic and transparent to crew operation.
(9) TERRAIN CLEARANCE FLOOR AND RUNWAY FIELD CLEARANCE FLOOR
(a) The Terrain Clearance Floor (TCF) alerting function adds an additional element of
protection to the standard Ground Proximity Warning System. It creates an
increasing terrain clearance envelope around the airport runway to provide CFIT
protection against situations where Mode 4 provides limited or no protection. TCF
alerts are based on current aircraft location, destination runway center point
position, and Radio Altitude (altitude AGL). TCF is active during takeoff, cruise,
and final approach. TCF complements the existing Mode 4 protection by providing
an alert based on insufficient terrain clearance even when in landing configuration.
(b) The TCF function is enhanced in all models (beginning with release –210-210 for
the MK V/VII) with the addition of a Runway Field Clearance Floor (RFCF) alerting
function. RFCF is based on current aircraft location, destination runway center
point position, and Geometric Altitude or altitude Above Sea Level (ASL) relative to
the destination runway. RFCF provides short landing protection for runways that
are significantly higher than the surrounding terrain.
(c) When an aircraft penetrates either the TCF or the RFCF alert envelope, the aural
　
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