INSTALLATION MANUAL
CMA-5024 GLSSU
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Page A.14
November 21, 2008
received as a set of three labels (033, 232, and 255) that burst from the requesting device. Three
bursts must be received within 3 seconds for the GLSSU to accept the request. A burst is used
instead of continuous data since there is no priority between the controller unit inputs and the use of
mismatched continuous data is not supported.
(n) When the SDI bits are used, input labels are rejected when the SDI bits do not match the GLSSU
SDI setting; otherwise the SDI bits are ignored when present. For this purpose 'All Call' (SDI = 00) is
considered a match.
(o) The label number is configurable by the APD as per Appendix E.
(p) The nominal transmit interval is 1000 ms; however a burst may be sent for a faster response to a
command.
(q) When the Supplementary Command Summary Word Label ID Assignment APD is set to a non-zero
value, Supplementary Command Summary Words received on the FMS busses using the specified
ID will be interpreted as if a label 227 was received including re-transmission on the GLS bus (when
required) using label ID 227; a zero value disables the Supplementary Command Summary Word
function on the FMS busses. The Command Summary Word on FMS inputs APD is used to disable
the Command Summary Word function on the FMS busses without affecting the Supplementary
Command Summary Word. Other input busses are not affected by these APD parameters.
(r) Variable pass-through labels, depending on the source instrument.
1.2.7 SBAS APPROACH SELECTION DATA INPUTS
The GLSSU selects the SBAS Approach using inputs received from the Controller Unit over the ARINC
419 Freq/Function Data Source, DADS/FMS, or FMS/IRS input busses, provided the received data
labels are set to "Normal Operation" and their SDI match the SDI settings of the GLSSU or are All Call.
Anyone of the two following selection methods may be used:
- The GLSSU will select in its internal database the approach parameters defined from 3 ARINC 429
data input labels: Channel Number, Airport ID #1, and Airport ID #2 labels 033, 232, and 255. In
this case, the GLSSU must contain a valid SBAS Approach Database.
- Or, the GLSSU will accept the approach data from a FAS Data Message (FASDM) received over
ARINC 429 data labels 045 & 046. The FASDM data must be formatted and broadcast from an
external database in accordance with section 7.2.6 (SBAS GLS) of ARINC characteristic 755; refer
to Appendix G for an example. In this case the GLSSU may or may not contain a valid SBAS
Approach Database.
1.2.8 ILS/DME DATA CONCENTRATOR INTERFACE
If the Data-Concentrator DME/ILS Bridge APD setting is enabled, it is assumed that the external
equipment, at the remote end of the DME input busses, acts as a data concentrator and outputs both
ILS & DME data. In this case:
- The GLSSU will accept both DME and ILS data from the DME input busses.
- The ILS input busses are not connected.
- When selecting an ILS source on the HIS (ILS/GLS Source Select Discrete Input is open), there will
be no data output on the ILS look-alike output busses since the ILS input busses are not connected.
- When selecting a GLS source on the HIS (ILS/GLS Source Select Discrete Input is ground), the
GLSSU will output both DME look-alike and ILS look-alike data on the DME look-alike output
busses, and it will not output any data on the ILS look-alike output busses.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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