User's Manual Part 1

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
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1--72
(g) Excessive Bank Angle
The T
2
CAS TAWS function produces call-- outs and alerts for descent below a set
of predefined altitudes and for excessive bank angle. Figure 1--24 shows
Excessive Bank Angle Envelope.
Figure 1--24. Excessive Bank Angle Envelope
The CPA mode of operation provides medium-- term (caution) and short--term
(warning) alerts to inform the crew that the flight path they are following is hazardous
due to the presence of terrain ahead. The objective of the CPA function is to warn
the crew of an impending controlled flight into terrain with sufficient time for them to
assess the situation and safely avoid the terrain hazard. All CPA predictions are
based on the assumption that the operational escape maneuver in case of a terrain
hazard will be a ”pull up” evasive action. CPA predictions model a conservative pull
up escape maneuver based on current aircraft climb capability.
The T
2
CAS CPA function provides alerts in the following CFIT situations:
• Hazardous descent rate with respect to terrain
• Hazardous closure rate with respect to terrain
• Hazardous terrain ahead situation during turns
• Hazardous high terrain ahead situation that can not be cleared by a pull up
maneuver