When the complete published procedure is not flown, and Is not fixed due to antenna placement like localizer, the splay angleĬan remain fixed, making a consistent width of final for aircraftīeing vectored onto the final approach course on different length Origin point of the lateral splay for the angular portion of the final The total width is usually 700 feet at the runway threshold. The width of the final approach course is tailored so that The scaling changes to linear instead of continuing to become more Less sensitive far from the runway) 2) close to the runway threshold, There are two differ- ences in the WAAS scaling and ILS: 1) on longįinal approach segments, the initial scaling will be ☐.3 NM toĪchieve equivalent performance to GPS (and better than ILS, which is Sensitivity increases to be similar to the angular scaling of an ILS. Scaling is provided until two (2) NM prior to the FAF, where the When the complete published procedure is flown, ☑ NM linear WAAS on the other hand is similar to the localizer.ĪIM 1-1-18 (d) 4 Both lateral and vertical scaling for the LNAV/VNAV and LPV approach procedures are different than the linear scaling of basic
DO YOU NEED WAAS FOR LNAV VNAV FULL
NM prior to the FAWP, the full scale CDI sensitivity will smoothlyĬhange from ☑ NM to ☐.3 NM at the FAWP. You can see a discussion of it in AIM 5-4-5 and other FAA publications. Results in RAIM and CDI changing to approach sensitivity. When are you able to obtain LNAV/VNAV when the approach allows for LPV, LNAV/VNAV, AND LNAV minimums 7 Answers Mark Kolber on Either a certified barometric VNAV (baro-VNAV) system (not typically in GA) or GPS with WAAS. 3 NM after the final approach fix.ĪIM 1−1−17 5 (e) (5) When within 2 NM of the Final Approach Waypoint (FAWP) with theĪpproach mode armed, the approach mode will switch to active, which GPS (non-WAAS) approaches have a constant full scale deflection of. Near the Outer Marker, a one-dot deviation puts you about 500 ft.
Near the Middle Marker, one dot means you’re off course by 150 ft. A CDI has 5 dots on each side, so at the threshold each dot is 70'. So full deflection to either side is 350'. Basically, the localizer is positioned so to have a course width of 700' at the threshold. Check out AIM 1-1-9 for localizer information.
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