User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Figure 1-20: Mode 3 – Excessive Altitude Loss after Take-Off Envelope
(d) Mode 4: Incorrect Aircraft Configuration With Regard to Terrain
T
3
CAS meets the requirement for Mode 4 alerts as defined in RTCA DO-
161A. Mode 4 applies during the landing phase of flight and results in the
annunciation of an alert in the event of insufficient terrain clearance when
the aircraft is not in the proper landing configuration. Mode 4 consists of
the following two sub-modes:
● Mode 4A, when the landing gear is up
● Mode 4B, when the landing gear is down, but the flaps are not in
landing configuration.
Figure 1-21 shows Mode 4 - Unsafe Terrain Clearance Envelope.
NOTE:
For the Long Range aircraft types (A340-500-600, A340-200-
300, A330), the Mode 4 envelope area of “Too Low Gear” has
been extended from 190 knots to 200 knots. The Mode 4
envelope area of “Too Low Flaps” has been extended from
159 knots to 180 knots. This was decided upon consideration
of computed airspeed based on aircraft type and speed
approach capabilities.
Pub. No. 8600200-001, Revision 004
34-45-29
1-88
04 Nov 2014
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.