User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
B. TAWS/RWS Operation
The principal modes of operation and display features of the TAWS/RWS function are
discussed in the paragraphs that follow. In-flight procedures with display examples are
contained in the T
3
CAS Pilot’s Guide, ACSS Publication No. 8008010-001.
(1) TAWS Operational Modes
The T
3
CAS TAWS function provides both conventional GPWS and Collision
Prediction and Alerting (CPA) modes of operation.
The conventional GPWS modes of operation are as follows:
(a) Mode 1: Excessive Rate of Descent with Respect to Terrain
This mode provides, as defined in RTCA DO-161A, a reactive medium-
term caution and a reactive short-term warning when the current flight
path is descending toward the terrain ahead of the aircraft at an
excessive rate. Figure 1-18 shows Mode 1 - Excessive Descent Rate
Envelope.
Figure 1-18: Mode 1 – Excessive Descent Rate Envelope
(b) Mode 2: Excessive Closure Rate to Terrain
When the CPA mode is inoperative, this mode provides, as defined in
RTCA DO-161A, a reactive medium-term caution and a reactive short-
term warning when the current flight path and the terrain ahead of the
aircraft are closing at an excessive rate. When the CPA mode is
operative, Mode 2 is conditionally activated when a terrain cell in the
terrain database is detected to be significantly low. Figure 1-19 shows
Mode 2 - Excessive Terrain Closure Rate Envelope.
Pub. No. 8600200-001, Revision 004
34-45-29
1-86
04 Nov 2014
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