CMC electronic Esterline CMA-5024 User Manual

INSTALLATION MANUAL
CMA-5024 GLSSU
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without prior written permission by CMC Electronics Inc.
Page 205
November 21, 2008
equipment, perform additional troubleshooting tests to confirm the diagnostic using Appendices A
to D.
Note: Some installations require pitch/roll/heading attitude input data from an IRS for
computing the lever arm correction and the flight deviations, otherwise the SSM bits
will be set to No Computed Data ("NCD"); refer to the Attitude Data Used APD
parameter setting in Appendix E. The absence of attitude data is reported as full-
scale up/right deviations during the guidance test.
4. OPERATIONAL GROUND TESTS
A. Set-Up
The aircraft should be located in an area where the ground power generators and later the engines may
be run to supply power to the aircraft's avionic and hydraulic systems. In addition to test the GLSSU it is
necessary to position the aircraft in an area clear of surrounding obstructions and electromagnetic
interference.
Apply power to the aircraft. Power-up the GLSSUs, the FMS and the aircraft systems required for
controlling the GLSSUs and displaying their status. Ensure that all other electrical systems are
shutdown so that a baseline condition with minimum RF interference will exist.
A minimum of 15 minutes to 30 minutes of operation may be required to update the internal GPS
satellites almanac for a newly installed GLSSU or one that has not been recently used. If the almanac is
older than 3.5 days, the GLSSU will consider it invalid for predicting RAIM requests. If the almanac is
older than one month, the GLSSU will not enter SBAS NAV or SBAS PA modes.
B. Check for system failures
Ensure that no GLSSU failures are reported. Should such faults be detected, use the interface and
troubleshooting information in Appendices A to D for isolating the fault.
C. Check the GLSSU Navigation Mode
Using the FMS or alternate means, verify that the GLSSU is in Navigation Mode (NAV), in SBAS
Navigation Mode (SBAS NAV), or in SBAS PA mode. If not, ensure that the aircraft is located outside
hangars in an unobstructed area free of RF interference.
D. Check the Navigation Data
Using the FMS or alternate means, verify that the GLSSU reports acceptable navigation data (position,
altitude, date and time); compare results with similar installations operating in the vicinity at the same
moment.
Using the FMS or alternate means, check that the GLSSU reports an acceptable number of visible
satellites and of tracked satellites; compare results with similar installations operating in the vicinity at
the same moment. These data items are reported by the GLSSU on label 273; refer to Appendix C for
the data format.
34-52-81-1
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CMC electronic Esterline CMA-5024 Specifications

General

Brand	CMC electronic
Model	Esterline CMA-5024
Category	Accessories
Language	English