While on the 45-degree inbound to final, select the APR mode on the autopilot to arm, then capture, the glideslope at the right time.įigure 2. If you’re vectored onto the approach within two miles of the final approach fix it won’t happen. This happens when you penetrate a box between two and 15 miles from the final approach fix, and within 1.2 nm of the final approach course, providing you first switch the NAV frequency for the ILS (110.50) into active (center picture). On the right you see the CDI has switched to VLOC. The center picture shows us tracking the GPS course outbound on the procedure turn, which has a TOD in the turn to start down the VNAV course to CULUL. To automatically switch the CDI on the 750 from GPS to VLOC when intercepting the final approach course inbound, enable this on the System -> Setup page. You can enter the minimum altitude for this approach (264 feet) into the PFD as a reminder on final to the RW14 map. You should review the waypoint altitudes too, but these are shown on your flight plan list, and on the map next to each waypoint (see the 2100 box next to CULUL on Figure 1). While enroute to the TOD, this is a good time to review the chart for the ILS course bearing, minimums, and missed approach procedure. Note that while the S-TEC 3100 digital autopilot names this lateral mode GPSS, the GFC 500 autopilot only has a NAV button, but tracks these digital roll commands in that mode. Note the GPS altitude (GSL) of 4,500 feet on the map (upper right corner), and the VNAV altitudes of waypoints on the flight plan list.Īfter takeoff, with the autopilot in GPSS mode if digital, or on an analog autopilot in HDG or NAV if you have an external or internal GPSS convertor, you’ll keep the CDI on the 750 in GPS mode until switching to VLOC for the ILS. We are one min from the TOD (left), a reminder to enable VNAV and engage the VNAV mode on a GFC 500 or 600. A flight plan (right) consisting solely of the ILS 14 to KMYV, with CULUL as the initial approach fix. On this same Menu page, you can enable VNAV.įigure 1. If instead you want to descend at, say 500 feet per minute, select that here and the TOD point will adjust accordingly. First, check the VNAV descent rate on the Flight Plan page (Menu -> VNAV) to determine the vertical rate that will reach the desired VNAV altitude. If not, but you have an autopilot with VS mode, you can use that. If VNAV is enabled in the 750, and you have a Garmin PFD and their recent digital autopilot, you can fly this VPTH (vertical path) with the autopilot in VNAV mode. CULUL has a crossing altitude of 2,100 feet. Note on the top right that the first leg is “Direct CULUL.” Climbing to 4,500 feet creates a Top-of-Decent (TOD), where the VNAV course to CULUL begins. This is a quick way to make a flight plan for practice approaches without having to specify your home airport or destination in the plan.įigure 1 shows the map page of the flight on the left, including the missed approach to YUBBA, while the right side has the flight plan with the VNAV altitudes listed for the step-downs. In this process, the ILS frequency is put into NAV standby. By activating it on the ground a flight leg is created from KGOO to CULUL, which is the initial approach fix and (after the procedure turn) the final approach fix. ![]() Choosing “Load Approach & Activate” creates a flight plan consisting solely of the approach. We enter the airport, the ILS 14, and the transition at CULUL. Here, we’ll walk through a typical scenario to illustrate the many ways in which that happens.įrom my home base of Nevada County Airport in Grass Valley, California (KGOO), let’s plan to fly the ILS 14 practice approach to nearby Yuba County Airport (KMYV), which is loaded into the 750 from the PROC page. In the age of glass panels, with modern GPS/VLOC receivers like the GTN 750, coupled with a primary flight display (PFD), most of the chores involved in shooting an ILS are automated. These, coupled with a CDI to show your course, required that you tune in the VOR or localizer (VLOC), and set the OBS course on the CDI to track that course. Many of us remember the days before GPS, when navigation was primarily with VORs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |