![]() (This would be advisable if you expect to be on a complicated STAR with short vectors to ILS final, precluding the auto-tune function.) You would enter the ILS identifier into appropriate LSK in the PROGRESS page and the ILS approach course in the Display Controller PREVIEW submenu. When the NAV preview information is displayed, the flight crew can modify the SRN course or deselect the NAV preview mode altogether.Īlternatively, you can preset the localizer frequency and the approach back course. When the auto NAV preview conditions are satisfied, the NAV preview information is displayed on the PFD. ![]() The on-side SRN source frequency specified by the FMS approach is tuned by the FMS. The aircraft is within 75 NM flight plan distance and 30 NM direct distance from the destination airportĪn SRN approach is selected in the FMS flight planĪuto-tuning is enabled for the on-side NAV receiver The EDS automatically selects the NAV preview mode when the following auto NAV preview enabling conditions are satisfied: With auto NAV preview functionality, the flight crew is still required to arm the flight director for automatic transition from LRN (FMS) guidance to SRN guidance. ![]() Selects the SRN source for the approach procedure entered in the FMS flight planĪutomatically sets the course on the display to the required in-bound course for the approach. When the necessary conditions are satisfied, the auto NAV preview functionality performs the following:Īutomatically selects the NAV preview mode Rwy 20 and 07's approaches are seldom (statistically). Rwy 07's are served by VOR approaches only. A localizer back course is just flying on the back side of the localizer to the runway, i.e., if the localizer is intended for runway 28 the back course lets you land on runway 10 instead. Nevertheless, after new equipment installation, the rwy 20 is equipped with an ILS (as rwy 25's and 02). The approach is conducted at John Wayne/Orange County Airport (KSNA) in Santa Ana, California, USA. A long-range navigation source (FMS) must be the active navigation source in order for the PREVIEW prompt to be displayed. In the past,there is a back loc approach that had been published on rwy20. The NAV preview mode permits the flight crew to select a short-range navigation (SRN) source for an SRN-based approach (VOR, ILS, MLS, etc.) while FMS (Long Range Navigation) is selected for display and providing lateral/vertical guidance. The PREVIEW submenu is used to select the NAV preview mode.
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