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.9
November 21, 2008
1.2 APD PARAMETERS DESCRIPTION
The GLSSU implements functionality according to the Aircraft Personality Data (APD). For functionality
related to I/O, the APD File applies to all ARINC 429 input and output busses that can perform that
function unless explicitly restricted to a given bus or bus type. At power-up or after an initiated Self-
Test, the GLSSU selects one of 16 APD Configurations according to the APD Select Discrete setting
and reports this setting in the 'APD Selection' bits of the Input Discrete Status label. The CRC labels
306 and 307 report the CRC of the currently selected APD Configuration. Note that if no selection can
be performed, the equipment ARINC 429 I/O will be turned off with the exception of the Data Loader
function.
Some APD parameters in the APD Configurations depend on the GLSSU SDI setting (e.g. the antenna
position). The Left/Right/Center Unit APD Defined parameters specify which of these SDI dependent
APD parameters are included in the APD. The Input Discrete Status label 157 reports the state of the
Left/Right/Center Unit APD parameters when the Synchronized Approach Selection APD is enabled;
otherwise the unit corresponding to the GLSSU SDI setting is reported as "Defined (On) and the others
as "Not Defined" (Off) irrespective of the APD Configuration content. If the SDI setting points to an
undefined set, the GLSSU will not allow an approach to be selected and the proportional deviations will
remain at full scale up/right will during the Guidance test. The relationship between Left/Right/Center
and the SDI Setting is as follows:
SDI pin #2 SDI pin #1 Unit # Unit Name
Open (0) Open (0) Invalid Invalid
Open (0) Ground (1) 1 Left
Ground (1) Open (0) 2 Right
Ground (1) Ground (1) 3 Center
A. Aircraft Personality Data (On/Off Options)
This section describes the APD parameters that are in the form of On/Off options.
(1) APD Parity Discrete Check
When On, the GLSSU uses the APD Select Parity Discrete Input to validate the combined
settings of the APD and SDI Inputs discretes.
When Off, the GLSSU ignores the APD Select Parity Discrete Input.
This setting applies for all APD Configuration numbers and must be identical in all APD
Configurations within an APD File. The recommended setting is On. When Off, an alternate
means must be provided in the installation to verify that the APD Selection is correct. The
'APD Selection' bits reported on the Input Discrete Status label or the APD CRC of the
current APD Selection reported on CRC labels 306 and 307 can be used for this purpose.
(2) HIS Input Power
When On, the GLSSU assumes that the High Integrity Switch (HIS) Input Power on
connector J3 is connected to the same power source as the GLSSU +28 Volt on connector
J1.
When Off, the GLSSU assumes that the HIS Input Power comes from a separate power
source and inhibits the testing of the backup HIS power supply to avoid nuisance fault
The document reference is online, please check the correspondence between the online documentation and the printed version.
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