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Garmin GRA 55 Maintenance Manual - Page 35

Removal Procedure, GRA 55/5500 Installation

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6. Seal the antenna and gasket with an approved sealant compound (MIL-A-46146) along the edge of the antenna where it meets the antenna mount. 6.3.2 Removal Procedure 1. Remove the sealant compound (MIL-A-46146) along the edge of the antenna where it meets the antenna mount using a non-metallic scraper. 2. Remove the hardware retaining the antenna in place. 3. Lower the antenna enough to disconnect the coaxial connector, and disconnect. 4. Remove the antenna and conductive gasket from the airframe. UNIT HOOK ENGAGEMENT FEET 2 PLACES FEET ENGAGEMENT LOCATION 2 PLACES LOCKDOWN MECHANISM COLLAR LOCKDOWN MECHANISM KNOB SECTION VIEW SHOWING UNIT FEET ENGAGED INTO MOUNTING RACK 2 PLACES Figure 6-1. GRA 55/5500 Installation 190-01277-A3 Rev. 1 System Maintenance Manual GRA 55/5500 Bell 206 STC Page 6-2

Section	Page
1 Introduction	10
1.1 Purpose	10
1.2 Scope	10
1.3 Document Control	10
1.4 Permission to Use Certain Documents	10
1.5 Definitions	10
1.6 Terminology	11
1.7 Publications	11
1.7.1 Applicability	11
1.7.2 Definition of Abbreviations	11
1.7.3 Precautions	11
1.7.4 Units of measurement	11
1.7.5 Referenced publications (or their later revisions)	11
1.7.6 Retention	11
2 System Description	12
2.1 Description of Alteration	12
2.2 Block Diagram	12
3 GRA 55/5500 Control and Operation	13
3.1 Control, Operating, and Testing Information	13
3.2 Downloading and Installing the GRA 55/5500 Retrofit Installation Tool	13
3.3 Using the GRA 55/5500 Retrofit Installation Tool	14
3.4 Installation Tool Pages	14
3.4.1 Status Page	15
3.4.2 Configuration Page	16
3.4.3 Software Page	17
3.4.4 Diagnostics Page	18
3.4.5 Utilities Page	19
3.4.6 Zero-Foot Calibration	20
4 Instructions for Continued Airworthiness	21
4.1 Servicing Information	21
4.2 Periodic Maintenance	21
4.3 Special Tools	21
4.4 Maintenance Intervals	22
5 Troubleshooting Information	27
5.1 GRA 55/5500 General Troubleshooting	27
6 Removal and Replacement Information	34
6.1 Unit Installation	34
6.1.1 Installation Procedure	34
6.1.2 Removal Procedure	34
6.2 Rack Installation	34
6.2.1 Installation Procedure	34
6.2.2 Removal Procedure	34
6.3 Antenna Installation	34
6.3.1 Installation Procedure	34
6.3.2 Removal Procedure	35
7 Return to Service Procedure	37
7.1 Return to Service	37
7.2 Maintenance Records	37
8 Limitations and Additional Requirements	38
8.1 Diagrams	38
8.2 Special Inspection Requirements	38
8.3 Application of Protective Treatments	38
8.4 Data Relative to Structural Fasteners	38
8.5 Additional Instructions	38
8.6 Overhaul Period	38
8.7 ICA Revision and Distribution	38
8.8 Assistance	38
8.9 Implementation and Record Keeping	39
9 Airworthiness Limitations Section	40
Appendix A Aircraft Specific Information	41