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 F.1
November 21, 2008
APPENDIX F
BUILT-IN SBAS APPROACH DATABASE SELECTION AND LOADING
1. GENERAL
This section provides information for the loading and periodic update of the SBAS Approach Database
into the GLSSU using an ARINC 615 compatible Data Loader Unit (DLU). This data update should be
performed monthly.
The GLSSU contains two SBAS Approach Database cycles (#1 and #2): One active, one inactive.
Each database cycle contains a date of validity tag and other status information that allows their
management.
Under normal operation, the pilot will use the Controller Unit to check the database status and select
manually which database is active, based on the validity dates and the current date. For operating
procedures, refer to the Controller Unit manual
When loading a new database, the GLSSU will select automatically which of the two internal copies will
be overwritten. Should the data loading process fail or abort, the affected cycle will be flagged as
being absent.
1.1 SBAS Approach Database suppliers
In accordance with paragraph 2.2.1.5.3 of DO-229D, the SBAS Approach Database built-in the GLSSU
must meet the standards specified in section 2 of RTCA DO-200A "Standards for processing
Aeronautical data".
CMC Electronics has developed an approved process for updating the SBAS Approach Database to
maintain data currency, and offers to customers an SBAS Approach Database subscription service.
To purchase this service, please consult CMC's support group at the address given in the header
pages of this manual. The SBAS Approach Database updates will be made available once the
customer will have completed and returned a subscription form, provided by CMC's support group.
Every SBAS Approach Database update cycle is effective for 28 days, with 13 cycles in a year. The
database updates are shipped eight (8) or more days prior to the effective date of each update cycle.
The SBAS Approach Database service may provide an incremental load or a full database cycle. An
incremental load provides only the differences with respect to the previous cycle. The GLSSU must
contain that previous cycle for an incremental load to occur.
1.2 DLU/GLSSU data upload protocol
The protocol of the data loader interface conforms to ARINC 615-3. The GLSSU supports only the
automatic upload mode using bus sequencing as defined in ARINC 615.
The System Address Labels (SAL), used in the communication protocol between DLU and GLSSU, are
226 and 201 respectively from/to the GLSSU. The DLU presets automatically these data labels and
other parameters using a "Configuration file" embedded in the database media.
Following power-up and once the DLU has configured itself; the data upload will process automatically
when all the following conditions are met:
(a) The aircraft is on the ground;
The document reference is online, please check the correspondence between the online documentation and the printed version.
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