GTN 625/635/650 TSO Installation Manual 190-01004-02Page 1-14 Rev. F1.5 Regulatory Compliance1.5.1 TSO Authorization and Advisory Circular ReferencesThe conditions and tests required for TSO approval of this article are minimum performance standards. Itis the responsibility of those installing this article either on or within a specific type or class of aircraft todetermine that the aircraft installation conditions are within the TSO standards. TSO articles must haveseparate approval for installation in an aircraft. The article may be installed only in compliance with 14 CFR part 43 or the applicable airworthiness requirements.All GTN unit functions are design approved under the TSO. Unauthorized changes or modifications to anyGTN unit product may void the compliance to required regulations and authorization for continuedequipment usage.The GTN units provide a GPS position output for use with ADS-B output equipment. It is the installer’sresponsibility to ensure the ADS-B Out system is compliant with AC 20-165 and to ensure compatibilitybetween the GTN unit and the ADS-B Out equipment. See Garmin ADS-B Out Compatible Equipment(Garmin P/N 190-01533-00) for compatible equipment shown to be eligible for 14 CFR 91.227-compliantinstallations in accordance with AC 20-165.FIS-B information is to be used for pilot planning decisions and pilot near-term decisions focused onavoiding areas of inclement weather that are beyond visual range or where poor visibility precludes visualacquisition of inclement weather.FIS-B weather and NAS status information may be used as follows:1. To promote pilot awareness of own ship location with respect to reported weather, including haz-ardous meteorological conditions, NAS status indicators, and enhance pilot planning decisions andpilot near-term decision-making.2. To cue the pilot to communicate with the Air Traffic Control controller, Flight Service Stationspecialist, operator dispatch, or airline operations control center for general and mission criticalmeteorological information, NAS status conditions, or both.FIS-B information, including, weather information, NOTAMs, and TFR areas, are intended for the solepurpose of assisting in long- and near-term planning decision making. The system lacks sufficientresolution and updating capability necessary for aerial maneuvering associated with immediate decisions.
