GNS 400W Series Installation Manual Page 1-15190-00356-08 Rev. G1.6.5 AFM/AFMS/POH ConsiderationsIf the following information is not already included in an AFM, AFMS, or POH via an existing STC, itmay be used as guidance in developing an approved AFM, AFMS, and/or POH, provided the installation:is comprised of one or more TSO-C146a Class 3 approved Garmin GNS 400W series navigationunit(s) with GPS software version 3.0 or later approved version, and one or more Garmin approvedGPS/SBAS antenna(s) (see Table 1-2),is installed in accordance with the guidance in AC 20-138C and the installation instructions in thismanual.For installations or operation that requires dual GNSS installations, the installation needs to include oneor more Garmin GNS 400W series unit along with another Garmin TSO-C146a or TSO-C146c Class 3approved GPS unit (such as the GNS 500W series or the GTN 6XX/7XX series units).When using the following information to develop the AFMS, the information in [brackets] are examplesand should be updated appropriately for the specific installation and the equipment installed in thespecific aircraft. The paragraphs ―applicable to dual installations‖ should be included only for aircraftthat include dual GNSS installations.GARMIN GNSS (GPS/SBAS) NAVIGATION SYSTEM EQUIPMENT APPROVALSFor FAA approved installations in U.S. registered aircraft:The Garmin GNSS navigation system is a GPS system with a Satellite Based Augmentation System(SBAS), comprised of [a TSO-C146a Class 3 approved Garmin GNS 430W with GPS software version3.0, and a Garmin GA 35 antenna]. The Garmin GNSS navigation system in this aircraft is installed inaccordance with [AC 20-138C].The Garmin GNSS navigation system as installed in this aircraft complies with the requirements of [AC20-138C] and has airworthiness approval for navigation using GPS and SBAS (within the coverage of aSatellite Based Augmentation System complying with ICAO Annex 10) for IFR en route, terminal area,and non-precision approach operations (including those approaches titled ―GPS‖, ―or GPS‖, and ―RNAV(GPS)‖ approaches). The Garmin GNSS navigation system is approved for approach procedures withvertical guidance including ―LPV‖ and ―LNAV/VNAV‖ and without vertical guidance including ―LP‖(for main SW version 3.30 or later) and ―LNAV‖, within the U.S. National Airspace System.The Garmin GNSS navigation system complies with the equipment requirements of AC 90-105 andmeets the equipment performance and functional requirements to conduct RNP terminal departure andarrival procedures and RNP approach procedures without RF (radius to fix) legs. Part 91 subpart K, 121,125, 129, and 135 operators require operational approval from the FAA.The Garmin GNSS navigation system complies with the equipment requirements of AC 90-100A forRNAV 2 and RNAV 1 operations. In accordance with AC 90-100A, Part 91 operators (except subpart K)following the aircraft and training guidance in AC 90-100A are authorized to fly RNAV 2 and RNAV 1procedures. Part 91 subpart K, 121, 125, 129, and 135 operators require operational approval from theFAA.Applicable to dual installations consisting of two Garmin GNSS units: The Garmin GNSS navigationsystem has been found to comply with the requirements for GPS Class II oceanic and remote navigation(RNP-10) without time limitations in accordance with [AC 20-138C] and FAA Order 8400.12B. TheGarmin GNSS navigation system can be used without reliance on other long-range navigation systems.This does not constitute an operational approval.Applicable to dual installations consisting of two Garmin GNSS units: The Garmin GNSS navigationsystem has been found to comply with the navigation requirements for GPS Class II oceanic and remotenavigation (RNP-4) in accordance with [AC 20-138C] and FAA Order 8400.33. The Garmin GNSSnavigation system can be used without reliance on other long-range navigation systems. Additional