GDL 90 System ICA, Helicopter STC
Garmin AT
2345 Turner Rd SE 21 December 2005
Salem, OR 97302 Part #: 560-0255-00 Rev A
©Copyright 2005 Garmin AT All Rights Reserved Page 3 of 13
Table of Contents
1INTRODUCTION...............................................................................................................................................4
1.1 DOCUMENT REVISION &DISTRIBUTION PROCESS..............................................................................................4
1.2 AIRWORTHINESS LIMITATIONS SECTION (ALS)......................................................................................................4
1.3 PERMISSION TO USE CERTAIN DOCUMENTS ..........................................................................................................4
1.4 ASSISTANCE.........................................................................................................................................................4
2INSTRUCTIONS FOR CONTINUED AIRWORTHINESS ..........................................................................5
2.1 INTRODUCTION....................................................................................................................................................5
2.2 DESCRIPTION OF ALTERATION..............................................................................................................................6
2.3 CONTROL,OPERATING INFORMATION ..................................................................................................................8
2.4 SERVICING INFORMATION ....................................................................................................................................8
2.5 PERIODIC MAINTENANCE INSTRUCTIONS ..............................................................................................................8
2.5.1 Equipment Calibration ..............................................................................................................................8
2.5.2 GDL 90 Battery Replacement....................................................................................................................8
2.5.3 Cleaning the GSL 71 Front Panel.............................................................................................................9
2.5.4 Altitude Encoder Calibration ....................................................................................................................9
2.6 OVERHAUL PERIOD .............................................................................................................................................9
2.7 TROUBLESHOOTING INFORMATION.......................................................................................................................9
2.8 REMOVAL AND REPLACEMENT INFORMATION........................................................................................................9
2.9 GENERAL PROCEDURAL INSTRUCTIONS ..............................................................................................................10
2.10 DIAGRAMS.........................................................................................................................................................11
2.11 SPECIAL INSPECTION REQUIREMENTS.................................................................................................................12
2.12 APPLICATION OF PROTECTIVE TREATMENTS ........................................................................................................12
2.13 DATA RELATIVE TO STRUCTURAL FASTENERS .......................................................................................................12
2.14 SPECIAL TOOLS .................................................................................................................................................12
2.15 ADDITIONAL INSTRUCTIONS FOR ROTORCRAFT OPERATING UNDER FAR 121/135 ...............................................12
2.16 IMPLEMENTATION AND RECORD KEEPING ..........................................................................................................12
List of Figures and Tables
FIGURE 1–SAMPLE GDL 90 SYSTEM ............................................................................................................................6
FIGURE 2. GSL 71 FRONT PANEL ..................................................................................................................................7
TABLE 1: GDL 90 SYSTEM COMPONENTS ......................................................................................................................7
TABLE 2. UNIT WEIGHTS.............................................................................................................................................11
TABLE 3. UNIT CENTER OF GRAVITY...........................................................................................................................11
TABLE 4. UNIT POWER LOADS.....................................................................................................................................11
