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 12
November 21, 2008
At least two and up to three FMSs must be installed in order to provide redundancy. Up to three
FMS can be connected to each GLSSU by means of the dual IRS/FMS bus inputs, plus one of the
dual FMS/DADS bus inputs.
The DADS data sources should be connected to each GLSSU by means of the dual FMS/DAS bus
inputs, and in addition each FMS may output/rebroadcast the DADS data to each GLSSU, in order
to provide redundancy.
(ii) Cross-talk bus interconnections
The cross-talk bus interconnections between GLSSUs are optional. If they are not made, each
Controller Unit will operate and control only the GLSSU to which it is connected. Up to three
GLSSU can be interconnected. If the cross-talk connections are made, they must be made as
follows; refer to Section 1.2.3 in Appendix E:
- For cross-talk connections in a dual installation (Left/Right units), interconnect the Left & Right
units using the opposite X-Talk #1 inputs.
- For cross-talk connections in a triple installation (Left/Center/Right units), interconnect Left &
Right units using the opposite X-Talk #1 inputs, Center unit outputs to the Left and Right X-Talk
#2 inputs, Left unit outputs to the Center X-Talk #1 input, and Right unit outputs to the Center
X-Talk #2 input
(iii) Automatic SBAS Approach data cross-loading
The synchronization of the SBAS approach parameters between multiple GLSSUs is typically
desired in class-Delta-4 equipment.
If the Controller Units (typically, FMSs) perform this synchronization or if this synchronization is not
required, the cross-talk connections between GLSSUs are optional and the Synchronized Approach
Selection APD parameter (refer to Appendix E) must be disabled, whether or not the cross-talk
connections are present. The cross-talk connections may still be used for automatic position
cross-checks as described below.
If this synchronization must be performed by the GLSSUs themselves, the cross-talk connections
between GLSSUs must be implemented and the Synchronized Approach Selection APD
parameters in the GLSSUs must be enabled.
(iv) Automatic position cross-check
The requirement for position cross-checking will be determined by the system integrator, based on a
system safety assessment.
The GLSSU can support the safety requirements of TSO-C145b/146b for fixed-wing aircraft without
the need for a cross-check. For rotary-wing aircraft, a cross-check may be required when external
attitude data is used to compute the Navigation center (refer to the Attitude Data Used APD in
Appendix E).
The position cross-check can be performed either be the GLSSUs or in other aircraft avionics. The
cross-talk connections must be implemented to allow the GLSSUs to perform automatic position
cross-checks, and the Cross-Check APD parameter must be enabled; refer to Appendix E.
The document reference is online, please check the correspondence between the online documentation and the printed version.
To Next Page
Loading...
Need help?
General
