Sdf localizer7/26/2023 ![]() ![]() When a VOR, DME, VORTAC, VOR/DME, TACAN, NDB, or compass locator facility including locator outer marker and locator middle marker is operational and the respective aircraft is equipped with operational navigation equipment that is compatible with conventional navaids. This category of use is referred to as “substitute means of navigation.”Ģ. For example, if equipped with a suitable RNAV system, a pilot may hold over an out-of-service NDB. ![]() When a very-high frequency omni-directional range (VOR), DME, tactical air navigation (TACAN), VORTAC, VOR/DME, nondirectional beacon (NDB ), or compass locator facility including locator outer marker and locator middle marker is out-of-service (that is, the navigation aid (navaid) information is not available) an aircraft is not equipped with an ADF or DME or the installed ADF or DME on an aircraft is not operational. This paragraph sets forth policy concerning the operational use of RNAV systems for the following applications within the U.S. Use of Suitable Area Navigation (RNAV) Systems on Conventional Procedures and RoutesĪ. In the AFMS for other GPS Navigators such as the GNS530W, it states that if the approach is not approved for GPS such as an ILS, the CDI must have the ILS displayed on it and the GPS cannot be used for navigation. Activating a Vector-to-Final (VTF see the Flight Management Section) also causes the CDI to switch to LOC navigation source GPS steering guidance is not provided after this switch. The GPS CDI deviation is less than 1.2 times full-scale deflection GPS steering guidance is still provided after the CDI automatically switches to LOC until LOC capture, up to the Final Approach Fix (FAF) for an ILS approach, or until GPS information becomes invalid. ![]() A valid localizer frequency has been tuned.The final approach fix (FAF) is the active waypoint, the FAF is less than 15 nm away, and the aircraft is moving toward the FAF.A localizer or ILS approach has been loaded into the active flight plan.The system automatically switches from GPS to LOC navigation source and changes the CDI scaling accordingly when all of the following occur: ![]()
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