User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
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CAS/Part No.9005000
4 Mode 4: Incorrect aircraft configuration with regard to terrain
T
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CAS meets the requirement for Mode 4 alerts as defined in
RTCA DO-161A. Mode 4 usually 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 submodes:
● Mode 4A, when the landing gear is up
● Mode 4B, when the landing gear is down, but the flaps are
not in landing configuration.
5 Mode 5: Excessive glide path deviation
T
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CAS meets the requirement for Mode 5 alerts as defined in
RTCA DO-161A. Mode 5 applies in the event of an excessive
descent below the instrument glide path when making a front-
course approach with the gear down. In a back-course landing
configuration, Mode 5 is automatically inhibited.
When Localizer Performance with Vertical guidance (LPV) data
is provided to the T
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CAS unit in the same format as the ILS
Glideslope Deviation data, LPV Mode 5 operation is supported
by T
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CAS. Coordinate with ACSS regarding the LPV data
format sourced by the T
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CAS interfacing equipment installed on
the aircraft to determine if the input format can be supported by
the T
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CAS unit.
6 Call-outs and excessive bank angle
As defined in RTCA DO-161A, T
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CAS produces call-outs and
alerts for descent below a set of predefined altitudes and for
excessive bank angle.
(d) Terrain Display
The T
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CAS TAWS function provides two outputs to ARINC 708A
compatible displays to provide terrain-related information to the crew
through the weather radar or EFIS displays in order to enhance flight
crew situational awareness. When no threat is perceived, the TAWS
display shows with different levels of colors, the height of the surrounding
terrain relative to the aircraft altitude and takes into account the aircraft
flight path angle. Upon detection of a potential CFIT threat, the terrain
texture is modified on the terrain map in order to identify the location and
level (caution/warning) of the threat.
(e) Reactive Windshear (RWS)
NOTE:
The FMO “Windshear Enable” and the TAWS function must be
enabled in order for the RWS function to activate. TAWS is
enabled via program pin RTP-11H.
T
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CAS may optionally incorporate a Reactive Windshear feature as part
of its basic functionality. The reactive Windshear Warning algorithm
continuously monitors wind factors that affect aircraft performance on
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Pub. No. 8600200-001, Revision 004
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