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Honeywell
MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
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3.3.3 Category 3 – Position Input Select
Category 3 defines the Global Position System bus type and interface. GPS Input selection is
available in the following formats: ARINC 429 low speed and ARINC 429 high speed in either
ARINC 743 or 743A format, RS-232, and Internal GPS card.
CAUTION
Not all GPS receivers calculate Horizontal Figure of Merit (HFOM) and Vertical Figure of Merit
(VFOM) correctly and thus are unacceptable sources of position. The following GPS systems are
know to have FOM computational errors:
Universal GPS-1000
3.3.3.1 Instructions
1. Using Appendix E Tables E 3, Under Step/category 3 select Position Input Source. Using
table E 3.1.3 and E 3.1.3-x select ID number for your position input source and record that
number on Table E 3 under Ident No. for step 3. This number will be used during
programming of the configuration module.
2. Appendix E Tables E 3.1.3-x, where x is the position input type number, define the electrical
interfaces required to support the position input type. Using Tables E 3.1.3-x determine the
wiring interconnects and record it on Appendix A Fig A1-3.
Note: See Category 7 to select GPS Altitude Reference (mean sea level or WGS-84)
for ARINC 429 label 076.
3.3.3.2 ARINC 743 Format
This option provides the ability to specify the GPS input data format as ARINC 743 instead of the
ARINC 743A data format. For ARINC 743A the VFOM is in feet and the HFOM is in nautical miles
(nm). For ARINC 743 both VFOM and HFOM are in meters.