Honeywell MK VI - Manual (Page 69)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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3.8 Category 6 – Terrain Display Select
Category 6 defines the Terrain Display options available.
TA&D and TCF mode enabling/disabling is controlled by Category 6.
Peaks mode availability is controlled by Category 6 since its availability is determined by the display
configuration. Peaks mode enabling/disabling is controlled by Category 7. Each of the options controlled by
Category 6 is described below.
Appendix E Table 5.3.6 defines the Terrain Display Select options (Display Configuration Group Tables, Display
Input Control Group Tables and Output 429 Bus Group Tables) and identifies the first MK VI/MK VIII EGPWS
version in which the option was available (see the Effectivity entry). Appendix E Table 5.3.6 also defines the
EGPWS version (MK VI or MK VIII) in which the option is available (see the EGPWS entry).
Appendix E Tables 5.3.6.1-x, where x is the Display Configuration group number, define the display options and
the electrical interface required to support each Display Configuration.
Appendix E Tables 5.3.6.2-x, where x is the Display Input Control group number, define the label set and the
electrical interface required to support each Display Configuration.
Appendix E Tables 5.3.6.3-x, where x is the Output 429 Bus group number, define the label set and the
electrical interface supporting each Display Configuration output requirements.
Figure 3.8-1 is an example of single tube Wx/Terrain display wiring connections.
3.8.1 TAD & TCF Selection
The Terrain Clearance Floor (TCF) algorithm identifies premature descent for approaches regardless of aircraft
configuration. It creates a terrain clearance envelope around the airport to provide protection against controlled
flight into terrain situations beyond that of the basic GPWS.
The Terrain Awareness & Display feature consists of a Terrain Awareness Alerting feature and a Terrain
Awareness Display feature. The Terrain Awareness Alerting feature continuously computes terrain clearance
envelopes ahead of the aircraft and issues alerts if the boundaries of these envelopes conflict with terrain
elevation data in the terrain database. The Terrain Awareness Display feature displays the data terrain relative
to aircraft altitude.
Both TA&D and TCF are Enabled for all ID’s in Appendix E Table 5.3.6 except for “TA&D and TCF Disable” (ID
2).