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Alerts for Mode 5 display GND PROX on the PFDs, and generate an aural “GLIDESLOPE”
warning. Only two “GLIDESLOPE” warnings are given while in the Mode 5 outer “soft” envelope.
If the conditions worsen, two more “GLIDESLOPE” aural messages annunciate at a faster rate.
This pattern continues until the inner “louder” area is penetrated (2 dots or greater deviation,
below 300 feet AGL), at which time the “GLIDESLOPE” aural message will become louder and
continuous.
Below 150 feet AGL, glideslope alerting is desensitized to reduce the possibility of nuisance
alerts.
To permit maneuvering on final approach with an unreliable glideslope, the Mode 5 alert can be
inhibited by pressing the GS switch/light on the TAWS WARNING panel. The GS switch/light
can be engaged below 2,000 feet AGL, and is automatically reset before the next approach,
provided the aircraft has descended below 30 feet or climbs above 2,000 feet.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−21
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
TAWS WARNING Panel
Figure 17−10−21
Mode 6 – Callouts
Mode 6 provides the following advisory alerts:
• Approach minimums: One hundred feet above the RA, the “APPROACHING
MINIMUMS” alert will sound. The “MINIMUMS” callout occurs as the aircraft descends
through the selected minimums (RA or BARO).
• Altitude callouts: Specific callouts are program-pin selectable. Typical installation
includes: 1,000, 500, 50, 40, 30, 20, 10.
• Excessive bank angle: The excessive bank angle alert is a function of the roll angle
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 17−10−22
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (CONT'D)
TAWS Mode 6 Bank Angle
Figure 17−10−22
Mode 7 – Windshear Detection and Alerting
Mode 7 provides alerts and warnings in the event that significant windshear is detected by the
TAWS computer. Mode 7 is active during takeoff and landing phases of flight only, between 10
and 1,500 feet AGL.
TAWS Mode 7 Windshear Thresholds
Figure 17−10−23
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−23
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (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 17−10−24
Terrain Clearance Floor (TCF)
The TCF function of the TAWS 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 display GND PROX on the PFDs, 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
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