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--69
Figure 1--19. 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. Figure 1--20 shows Mode 2 -- Excessive Terrain Closure Rate
Envelope.
Figure 1--20. Mode 2 -- Excessive Terrain Closure Rate Envelope