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with respect to altitude above ground level. The alert envelope varies linearly from a 10°
bank at 30 feet AGL, to 40° of bank at 150 feet AGL, to 55° of bank at 2,450 feet AGL.
This will generate an aural “BANK ANGLE, BANK ANGLE” alert. The alert is
annunciated once, and will repeat if the bank angle increases by 20%. The alert will be
annunciated continuously if the bank angle is increased to 55°. The alert will be
annunciated until the bank angle is decreased below threshold value.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−30
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
EGPWS Mode 6 Bank Angle
Figure 17−10−27
Mode 7 – Windshear Detection and Alerting
Mode 7 provides alerts and warnings in the event that significant windshear is detected by the
EGPWC. Mode 7 is active during takeoff and landing phases of flight only, between 10 and
1,500 feet AGL.
EGPWS Mode 7 Windshear Thresholds
Figure 17−10−28
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−31
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
There are two types of windshear warnings: increasing performance (updraft/headwind), and
decreasing performance (downdraft/tailwind).
• For an increasing performance shear (updraft/headwind), an amber WINDSHEAR
message is annunciated on the PFD and flashes for 5 seconds, then remains steady. No
aural message is given.
• For a decreasing performance shear (downdraft/tailwind), a red WINDSHEAR message
is annunciated on the PFD and flashes for 5 seconds, then remains steady, and an aural
siren and “WINDSHEAR, WINDSHEAR, WINDSHEAR” warning are activated. Two
seconds after a windshear warning is issued, the autopilot, if engaged, is disconnected
and the flight director bars are removed. No escape guidance is provided.
PFD Windshear Display
Figure 17−10−29
Terrain Clearance Floor (TCF)
The TCF function of the EGPWS provides an additional terrain clearance alert envelope around
airports. This alert mode complements the existing Mode 4 protection, by providing an alert
based on insufficient terrain clearance even when in landing configuration.
TCF creates an increasing terrain clearance envelope around the intended airport runway,
directly related to the distance from the runway. TCF alerts are based on current airplane
location, nearest runway center point position and radio altitude, with an integral TCF airport
database.
Penetration of the alert envelope will illuminate the GND PROX switch/lights on the glareshield,
and generate an aural “TOO LOW TERRAIN” alert. The aural alert is repeated twice, and again
thereafter if the radio altitude value decreases by more than 20% from the altitude at which the
initial warning was issued. The aural message remains displayed, and the switch/lights remain
flashing, until the airplane exits the alert envelope.
Terrain Clearance Floor Database
The TCF database is integral to the EGPWC, and includes worldwide coverage of all airports
with hard-surfaced runways longer than 3,500 feet in length.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−32
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
Terrain Clearance Floor (TCF)
Figure 17−10−30
Terrain/Obstacle Awareness Alerting and Display (TAAD)
A feature of the EGPWS is the incorporation of the terrain/obstacle awareness alerting and
display function. This function uses aircraft geographic position, aircraft altitude, and a terrain
and obstacle database, to predict potential conflicts between the aircraft flight path and the
terrain or obstacle, and to provide terrain display overlay of the conflicting terrain or obstacles.
The terrain awareness alerting algorithms continuously compute terrain clearance envelopes
ahead of the aircraft, as a function of ground speed, flight path angle and track. If the
boundaries of these envelopes conflict with terrain elevation data in the terrain database, alerts
are issued. Two envelopes are computed, one corresponding to a terrain caution alert level and
the other to a terrain warning level.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−33
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
TAAD Caution and Warning Alert Envelopes
　
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