ILS system?

Question

If i tune the NAV1 Radio into the ILS FREQ will it allign the plane with that runway??

And whats the thing with "dont chase da needle"?

Answer 1

I answered your other question. The ILS freq only sends out one radial instead of all directions on a VOR. That radial is usually the runway heading. So if your fly towards runway 11 the course will be 110, just add a 0 to the runway to get your course. The needle will only center when you cross the extended centerline of the runway. The OBS doesn't do anything because there's only one radial.(at least in a real  aircraft) Chasing the needle refers to over-correcting when flying down the ILS/LOC. When correcting for a needle deflection make small adjustments to your heading. Remember the closer you get to the runway the more sensitive the needle becomes.

Answer 2

If you tune Nav 1 to the ILS frequency AND engage the autopilot in the ILS mode AND you are on the heading that will make the aircraft intercept the localizer - then the autopilot will align the aircraft with the runway.

Otherwise you have to do the work yourself.  Tuning the Nav radio is just the first step. Then you have to:

-  set the localizer inbound course on your OBS or HSI

- fly a heading to intercept the localizer (simply speaking position the aircraft on the extended localizer signal centerline) - when you do that the OBS or HSI needle will center

- afterwards you need to fly a heading that will keep that needle centered

Chasing the needle is a common error - it happens when the pilot fixates on the OBS or HSI needle and constantly turns the aircraft trying to center it - resulting in constant and often diverging heading oscillations.  The proper technique is to fly a heading, and when the needle drifts left or right apply a correction to your heading, wait and see whether it fixes the problem - eventually after a series of corrections arriving at a heading that keeps the needle centered.

All of the above will align the aircraft with the runway - on a ILS, LOC, or VOR approach.  In addition - ILS has another component - glideslope - that can guide you vertically towards the runway.

Answer 3

i cannot believe people think they can learn to fly on yahoo answers. jeez.

Answer 4

Is this for a video game?

In an ILS the frequency carrier sends out two waves (95 and 105 Hz I think) and the needle points to the average.  Been that way since Doolittle flew the first one.  The course doesn't have to set for the inbound heading -- the needle will show centered when you are on azimuth regardless of what's in the OBS window.

GS works the same way, only sideways.

Answer 5

You NEED to have the OBS (omni bearing selector) or Course Selector to the runway heading. Find a freeze heading and the freeze vertical speed.  A freeze heading means a heading that will hold you on the localizer course, which keeps you from chasing the needle. You should make only small corrections. To fly a standard 3 degree glideslope take your groundspeed and mutliply it by 5. that will give you a rough estimate in feet per minute what it takes to stay on the GS. Heading is the primary bank instrument on an ILS, Vertical Speed is the primary Pitch Instrument on an ILS. Use power for speed and dont listen to anyone else about thier other techniuqe which is BS.