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 201
November 21, 2008
SECTION III
POST INSTALLATION AND MAINTENANCE TESTS
1. GENERAL
This section describes the post installation procedures to verify the proper installation and to check
operation of the GLSSU and of the aircraft systems associated with them. They must be performed
following the installation of the GLSSU (section II), and for installation checkouts should failures be
suspected.
It is assumed that the installer has verified the aircraft interwiring prior to GLSSU installation, so that the
GLSSU will actually receive the proper ARINC 429/419 data from the proper aircraft systems.
Appendices A to D provide supplemental data interface and troubleshooting information for purpose of
aircraft interwiring verification and fault isolation.
2. TEST TOOLS AND AIRCRAFT SYSTEMS INFORMATION
It is assumed that the operator is familiar with the installation and operation of the aircraft systems in the
aircraft.
It is assumed that the aircraft instrumentation has been configured to enable access to the GLSSU data via
the Control Display Units (CDU) of a Flight Management System (FMS) or alternate means. If available, the
access procedures and display formats should be found in the aircraft operational flight manual and/or its
supplement.
An acceptable alternate means, as detailed below, is using an ARINC-429 bus emulator/analyzer connected
to the GLSSU by means of a breakout box.
3. POST INSTALLATION INSPECTION
A. GPS/SBAS antenna inspection
Check that the antenna is firmly mounted and sealed to the airframe. The bolts must be tightened. The
antenna connector must be clean and firmly seated. Check for traces of corrosion. Check the safety
wire holding the cable. Check the antenna cable for chafing, cuts and dents. If problems are suspected,
disconnect the suspect cable connectors and inspect the pins and sockets for internal damage, loose
connections and corrosion; then clean, dry-up and re-connect.
B. GLSSU inspection
Check that the GLSSU frame is firmly bolted to the airframe. The bolts must be tightened. Check that
the connectors at J1 and J2 are clean and firmly seated. Check for traces of corrosion. Check the
interconnecting cables for chaffing, cuts and dents. If problems are suspected, disconnect the cable
connectors and inspect the pins and sockets for internal damage, loose connections and corrosion; then
clean, dry-up and re-connect.
Check that the protective metal cap is either screwed on J3, or is taped firmly to the interconnecting
cable.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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