![]() Using the SAME ILS in BOTH directions has it's advantage (it's cheaper) but a drawback: The needle deflection on your instruments is BACKWARDS when going the WRONG WAY ON THE ILS! Hit the BC (back coourse) autopilot button if you are doing this. ![]() To save money, some airports will NOT bother to install a new ILS at the airport to land on the same runway going the other direction, but instead let you fly this second localizer BACKWARDS to come into the runway from the opposite direction of the regular ILS! This is called a BACK COURSE ILS. THIS IS USED FOR THE MISSED APPROACH, ALLOWING YOU TO CONTINUE FLYING ALONG THE EXTENDED CENTERLINE OF THE RUNWAY, EVEN AFTER PASSING OVER AND BEYOND THE RUNWAY. BC: Every ILS on the planet has a LITTLE-KNOWN SECOND LOCALIZER THAT GOES IN THE OPPOSITE DIRECTION AS THE INBOUND LOCALIZER.VNAV: Vertical Navigation: This will fly the altitude commanded by the FMS if you have an FMS in your airplane.TERR: Terrain Following: This will fly the aircraft at a low altitude, barely clearing the ground.It will fly the localizer and glideslope components of the ILS. APP: Approach: This is simply the combination of the LOC and G/S buttons.G/S: Glideslope: This will fly the glideslope portion of the ILS.This will fly a VOR radial or ILS localizer, or to a GPS destination. ![]()
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