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 E.19
November 21, 2008
PARAMETER EXAMPLE
LABEL ID
(OCTAL)
DIRECTION GPS BUS
AFFECTED
ARINC
743A-4
DEFINED
Total Power On Time 371 Out Yes
Total Power On Time Since
Last Service Shop Visit
373 Out Yes
Total Flight Cycles 375 Out Yes
Total Flight Cycles Since Last
Service Shop Visit
376 Out Yes
D. Aircraft Personality Data (ILS/DME Look-Alike Options)
This section describes the APD parameters that control the contents of labels output on the ILS
and DME Look-Alike busses when the ILS/GLS Source Select discrete input is set to GLS (pin
grounded). Note that #1 and #2 busses contain the same data; the GLSSU assumes that both
input busses also contain the same data and uses only one of the inputs, selecting an active one.
The Example column contains the choice for a typical installation; however these selections are
highly installation dependent.
(1) Look-Alike Frequency
This APD contains the frequency encoded in labels 033 or 034 on the ILS Look-Alike bus
and label 035 on the DME Look-Alike bus when substituted. The Example column contains
the standard test frequency so that it cannot be confused with an actual operational ground
station.
(2) Look-Alike DME Channel
This APD contains the DME channel number encoded in the DME Frequency label 035 on
the DME Look-Alike bus whose data will be substituted with GLSSU computed values. Other
channels are passed through unmodified. The selected channel depends on the SDI Setting
of the GLSSU.
The Example column shows the typical case where the SDI of the DME matches the SDI of
the GLSSU. This corresponds to installations where the left DME is routed through the left
GLSSU to reach the left DME display for equivalence to the left DME being tuned to the co-
location ILS ground station corresponding to the tuning of the left ILS receiver to provide the
distance on the left DME display; similarly for right and center equipment.
(3) Look-Alike Ground Station Identifier
This APD contains the Ground Station Identifier encoded in labels 242 & 244 or 263 & 264
on the ILS Look-Alike bus and labels 246 & 247 or a pair of label 300 on the DME Look-Alike
bus when substituted. The Example column contains a ‘Null’ ground station identifier in this
field; this causes that the GLS Approach Identifier of the selected approach will be
transmitted.
PARAMETER EXAMPLE* RANGE / RESOLUTION Units*
Look-Alike ILS/VOR Frequency 108.10 +108.00 to 117.95 / 0.01 MHz 0.01 MHz
Look-Alike DME Frequency 108.10 +108.00 to 117.95 / 0.01 MHz 0.01 MHz
Left Look-Alike DME Channel 1 +7 / 1 decimal
Right Look-Alike DME Channel 2 +7 / 1 decimal
Center Look-Alike DME Channel 3 +7 / 1 decimal
The document reference is online, please check the correspondence between the online documentation and the printed version.
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