INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page 13
Revision 1 Jan 19, 2009
Note: A failure of the position cross-check will only activate the failure flags on the deviation data
outputs of the GLSSU.
(v) SDI setting restrictions
- In a single GLSSU installation, the SDI discrete inputs must be set to designate a left-side, a
center or a right-side unit, as it is defined per the Left/Right/Center Unit APD Defined APD
parameters.
- In a dual installation, the SDI discrete inputs must be set to designate a left-side and a right-
side unit, as it is defined per the Left/Right/Center Unit APD Defined APD parameters.
- In a triple installation, the SDI discrete inputs must be set to designate a left-side, a center and
a right-side unit, as it is defined per the Left/Right/Center Unit APD Defined APD parameters.
D. Aircraft Personality Data (APD)
Each GLSSU contains an electronic APD File. This APD File is read once at each power-up. The APD
File contains a set of up to 16 different APD Configurations, each specific to a particular aircraft and
installation.
Refer to Appendix E for details on the APD-programmable parameters and on the APD Configurations
available for each of the GLSSU part numbers covered in this manual.
If an APD update is required, CMC Electronics must be consulted and the GLSSU must be returned to
the factory; refer to Appendix E for details. At customer's request, and using customer-provided
information, CMC Electronics will create additional GLSSU part numbers, as required, to adapt to new
aircraft installations without changing the GLSSU software itself.
The installer will choose the proper APD File by choosing the appropriate GLSSU part number at time of
ordering; refer to Appendix E. Then the installer will select the proper APD Configuration at installation
time, and will verify it; refer to Section II.
Note: The GLSSU APD Configuration is selected by means of four "APD select discrete" signal
inputs, plus an extra "APD Select Parity Discrete" signal input that allows to detect a wiring
fault (refer to Appendix A).
The GLSSU broadcasts the actual APD Selection number defining the active APD Configuration in label
157 and the CRC of the active APD Configuration on the ARINC 429 GLS bus. Refer to Appendices A
and C for details. The APD File includes also a global CRC check, intended for use at the factory when
loading the APD File in the GLSSU.
Amongst other parameters, the APD Configuration data defines which of the ARINC 429 output busses
available on the approach aircraft connector J3 are configured as GPS or GLS busses. Typically they
are all configured as GLS busses since the navigation aircraft connector J1 provides the GPS busses.
Note: The three ARINC429 output busses from the navigation aircraft connector J1 operate only as
GPS busses, at either low speed (12.5 Kb/S) or high speed (100 Kb/sec), and are not
programmable by the APD Configuration to become GLS busses. The three ARINC 429
output busses from the approach aircraft connector J3 can be programmed individually by the
APD Configuration, to be either GLS busses or GPS busses; they operate only at high speed.
The APD Configuration parameters may also define the location of the antenna on the aircraft body, in
order to compute antenna lever-arm corrections using aircraft attitude information from the other aircraft
systems. Refer to the APD parameter "Navigation Center Position Output on GLS bus" in Appendix E
The document reference is online, please check the correspondence between the online documentation and the printed version.
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