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.20
November 21, 2008
Look-Alike ILS Ground Station
Identifier
‘Null’ Null or Four alphanumeric ISO#5
characters including “space”
Look-Alike DME Ground Station
Identifier
‘Null’ Null or Four alphanumeric ISO#5
characters including “space”
* The parameters are scaled and truncated as indicated above in the "Units" column. For example a VOR
frequency of 108.10 MHz will be recorded in the APD file as "+10810" in 0.01 MHz units.
E. Aircraft Personality Data (Selectable ILS & DME ARINC 429 Labels)
This section describes the APD parameters that control which labels are passed through on the
ILS and DME Look-Alike busses when the ILS/GLS Source Select discrete input is set to GLS
(pin grounded). Unlisted labels are always passed through with the exception of ILS deviations
labels 173 & 174 that are always replaced, the DME Frequency label 035 that is substituted
depending on the channel number, and the VOR Omnibearing label 222. The behaviour of label
222 depends on whether label 034 is selected; there is no distinct flag for label 222. When label
034 is selected, the SSM of label 222 is forced to NCD on output (except for Fault Mode where it
is Fail Warning); otherwise it is passed through.
Each label (or pair) listed can be selected/de-selected individually. If the label is de-selected
(Setting = No) in the APD then the label will be passed through on the output bus with the input
data preserved. If the label is selected (Setting = Yes), then the input label is discarded unless it is
DME data that does not belong to the DME channel specified in the Look-Alike DME Channel
APD in which case it behaves as if the label were de-selected except for the display bit of label
035 that is set to zero and the SSM of the BCD labels that is set to NCD.
For DME Look-Alike data, the selected label contents is generated by the GLSSU but the label
output rate depends on the input; this data is based on a projection to the horizontal plane of the
distance to the LTP/FTP, not a DME slant range. When the corresponding input label for the
specified DME channel is received, the output label is transmitted within 100 ms using currently
available GLSSU data; this will approximate the input rate and preserve the order of labels. The
nominal transmit interval is used and input labels ignored when there is no activity (per the activity
label 035) on the DME input bus.
For non-DME data parameters, the selected labels are output at the nominal transmit interval with
data generated by the GLSSU irrespective of their presence on the input.
PARAMETER ASSOCIATED LABELS
033 (ILS) ILS/VOR Frequency
034 (VOR)
017 (BCD) Selected Runway Heading
105 (BNR)
263 & 264 (ILS) Ground Station Identifier (ILS/VOR)
242 & 244 (VOR)
201 (BCD)
202 (BNR)
Distance to LTP/FTP (DME data)
214 (BNR – Precise DME)
002 (BCD) LTP/FTP Time-To-Go (DME data)
252 (BNR)
012 (BCD) LTP/FTP Range Rate (DME data)
117 (BNR – Precise DME)
The document reference is online, please check the correspondence between the online documentation and the printed version.
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