Garmin GA 35 Installation Instructions Manual

Also see for GA 35: Installation instructions

Contents

Page 2-4 GA 35, GA 36, and GA 37 Antenna Installation InstructionsRevision B 190-00848-002.3 Antenna DoublerIf installing the antenna onto existing provisions a doubler may not be required. If installing the antennausing AML STC SA01695SE as the basis for approval, one of the following antenna doublers may beused:• Antenna doubler P/N 115-00846-00, for the GA 36 and GA 37 antennas. This doubler containsnut plates (qty. 4) for the antenna mounting screws.• Antenna doubler P/N 115-00846-10, for the GA 35 antenna. This doubler does not contain nutplates.The above doublers may be purchased from Garmin or doublers may be fabricated in accordance with theAntenna STC Installation Manual 190-00569-00.2.4 Antenna GroundingThe antenna is grounded through the mounting hardware. The mounting hardware (washers and nuts) anddoubler plate should make contact with an unpainted surface ensuring proper antenna grounding.It is very important to have good conductivity between the coaxial shield and the ground plane. This isensured when all the fasteners properly ground the antenna base to the skin of the aircraft.2.5 Antenna InstallationIf installing antenna per Garmin GA Antenna AML STC SA01695SE, follow instructions contained inSTC Antenna Installation Manual 190-00569-00.If not installing per Garmin GA Antenna AML STC SA01695SE, develop installation data for fieldapproval including the following steps. Refer to the aircraft manufacturer’s specifications and AC 43.13-2A, Chapter 3 for appropriate guidance on antenna installation.1. Refer to Appendix A for the appropriate mounting cutout. Drill or punch the holes required.2. Install a doubler plate to reinforce the aircraft skin, as required.3. Secure the O-ring in the O-ring groove on the underside of the antenna.4. Place antenna over mounting holes, using the fours screw holes to align the antenna. Insert thesupplied four screws.5. Washers and locking nuts (not provided, may be part of doubler plate) are required to secure theantenna. Torque the four supplied #8-32 stainless steel screws 12-15 in-lbs for GA 35, or #10-32stainless steel screws 20-25 in-lbs for GA 36 and GA 37. Torque should be evenly applied across allmounting screws to avoid deformation of the mounting area.6. Insure that the antenna base and aircraft skin are in continuous contact with the O-ring.7. Seal the antenna and gasket to the fuselage using a good quality electrical grade sealant. Run a beadof the sealant along the edge of the antenna where it meets the exterior aircraft skin. Use caution toensure that the antenna connectors are not contaminated with sealant.CAUTIONDo not use construction grade RTV sealant or sealants containing acetic acid. Thesesealants may damage the electrical connections to the antenna. Use of these type sealantsmay void the antenna warranty.