ILS and AP

hyper670 Guest

Can you use the ILS frequency plugged in NAV1 and the Autopilot and have the plane flown towards that ILS?
If not then would I use the VOR near the airport get close switch to the ILS frequency and manually capture the ILS using localiser and glidescope indicators and then switch the APR?


1 Responses

Pro Member Trainee
ronaldpatton Trainee

If you have the ILS frequency in NAV1, you need to be on the ILS side of the airport (i.e. if it is a north bound ILS you need to be to the south of the aiport). You can have the autopilot intercept the localizer (the course portion of the ILS) using the NAV mode of the autopilot. It should fly a 30-45 deg. intercept and as the needle starts to center, your plane should turn inbound on the course. You can adjust the nav pointer on the HSI (or the bearing on the number 1 VOR) to the inbound course (but it does not change the way things fly the way it would if you were tracking a VOR). As for the glide slope portion. First thing is to get you airspeed down to your approach speed and have the gear down and the flaps set to the approach configuration (usually the first notch). You should be about 2,000-3,000 ft above the ground (and about 10 miles) out as you begin the approach and the needle for the glide slope should be deflected up (meaning you are below the glide path). As the glide slope starts to move toward the center (and when it is about 1-2 dots above center, you should select the APP mode of the autopilot and it should capture the glide slope and start you down. If you have the aircraft trimmed propery, a small reduction of power should keep your airspeed on target (and give you an decent rate of 400-600 FPM). As a rule of thumb, you trim for speed and adjust power to control decent/climb rate. That means, if you have the aircraft flying straight and level and it is trimmed so that it stays there all by itself, then any change in pitch will cause a change in airspeed, and if you leave the picth alone, any change in power will result in a climb/decent. As the autopilot captures the glide slope, it will re-trim the aircraft of pitch down to follow the glide path. That will cause your speed to increase, so you reduce power to keep your airspeed constant. I hope this helps. Oh yes, when you get to about 200ft above the runway, turn off the autopilot and reduce power to idle and pull back to slow your decent rate to about 100 FPM and you should settle down on the runway nicely.

All times are GMT Page 1 of 1

Related Questions