Table of Contentsiv 560-0982-01 Rev L GNS 480 (CNX80) Installation Manual2.6.1 MOUNTING TUBE INSTALLATION ...........................................................................................................2-102.6.2 UNIT INSERTION.....................................................................................................................................2-132.6.3 UNIT REMOVAL......................................................................................................................................2-142.6.4 UNIT REPLACEMENT ..............................................................................................................................2-142.7 ELECTRICAL CONNECTIONS ........................................................................................................................2-162.7.1 INTERFACE CONNECTOR DEFINITION .....................................................................................................2-172.8 FUNCTIONAL DESCRIPTIONS .......................................................................................................................2-242.8.1 POWER ...................................................................................................................................................2-242.8.2 MAIN COURSE DEVIATION INDICATOR ..................................................................................................2-242.8.3 AUXILIARY COURSE DEVIATION INDICATOR .........................................................................................2-262.8.4 COMPOSITE INDICATOR..........................................................................................................................2-262.8.5 ALTIMETER ............................................................................................................................................2-272.8.6 SYNCHRO HEADING ............................................................................................................................... 2-272.8.7 ANNUNCIATOR OUTPUTS .......................................................................................................................2-282.8.8 DISCRETE OUTPUTS ............................................................................................................................... 2-312.8.9 SWITCHES / DISCRETE INPUTS................................................................................................................2-322.8.10 SERIAL INTERFACES ..........................................................................................................................2-342.8.11 TIME MARK OUTPUT.........................................................................................................................2-392.8.12 VHF COM ........................................................................................................................................2-392.8.13 VHF NAV ........................................................................................................................................2-402.8.14 MESSAGE AUDIO............................................................................................................................... 2-402.8.15 RMI / OBI.........................................................................................................................................2-402.8.16 DME TUNING....................................................................................................................................2-412.9 ANTENNA INSTALLATION AND CONNECTIONS ............................................................................................2-422.9.1 COM ANTENNA .....................................................................................................................................2-422.9.2 GPS ANTENNA.......................................................................................................................................2-422.9.3 NAV ANTENNA .....................................................................................................................................2-452.10 WEIGHT AND BALANCE ..............................................................................................................................2-462.11 ELECTRICAL LOAD ANALYSIS ....................................................................................................................2-463 POST INSTALLATION CONFIGURATION & CHECKOUT PROCEDURES ............................................................3-13.1 MOUNTING AND WIRING CHECK ..................................................................................................................3-13.2 EQUIPMENT SETUP AND CONFIGURATION.....................................................................................................3-23.2.1 SETUP FUNCTION .....................................................................................................................................3-33.3 EQUIPMENT OPERATIONAL/FUNCTIONAL TEST ..........................................................................................3-193.3.1 GNS 480 CHECKOUT UTILITIES .............................................................................................................3-193.3.2 SYSTEM CHECKOUT – GROUND CHECKS................................................................................................3-303.3.3 SYSTEM CHECKOUT – FLIGHT CHECKS ..................................................................................................3-423.4 DATABASE CHECK ......................................................................................................................................3-433.4.1 DATA CARD REPLACEMENT...................................................................................................................3-433.5 AFMS UPDATE...........................................................................................................................................3-434 TROUBLESHOOTING .........................................................................................................................................4-14.1 TROUBLESHOOTING PROCEDURE ..................................................................................................................4-14.2 CONTACTING THE FACTORY FOR ASSISTANCE..............................................................................................4-45 LIMITATIONS....................................................................................................................................................5-15.1 OPERATION ...................................................................................................................................................5-15.2 TSO-C146A GPS/WAAS LIMITATIONS .......................................................................................................5-15.3 INSTALLATION ..............................................................................................................................................5-25.3.1 GPS ANTENNA.........................................................................................................................................5-25.3.2 ANTENNA INSTALLATION – GENERAL......................................................................................................5-25.3.3 EQUIPMENT INTERFACED TO THE GNS 480..............................................................................................5-25.3.4 PRESERVATION OF PREVIOUS SYSTEMS ...................................................................................................5-25.3.5 AIRCRAFT RADIO STATION LICENSE ........................................................................................................5-26 PERIODIC MAINTENANCE ................................................................................................................................6-16.1 EQUIPMENT CALIBRATION ............................................................................................................................6-16.2 VOR CHECKS ...............................................................................................................................................6-1