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ILS

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EHM-1486 Ricardo:

--- Quote ---Originally posted by YR-TGM
Hi,

- the plane will descend automatically only if you intercept the ILS from below.

- APP should be pressend when you're close to the localizer with a heading difference of at most 30 degrees, BELOW the glideslope

- ILS doesn't manage 'normal' speed
--- End quote ---


How can I check if i'm intercepting the ILS from below?

EHM-0962 Zhen Yi:
Well most of the time i estimate based on experience but you can take a look at the NAV screen (i think) and look at the little green pellet/diamond at the right side.......if your nav frequency is tuned correctly and you're below the glideslope, the green thing will appear above the midpoint of the meter on the right....

(i hope i didn't make any mistakes here :o)

EHM-1001 Robert:
Well, instruments are depend on your panel. Usually every panel have 2 main screens ND and FD or HSI and VSI. (alias Navigational Display, Flight Information Display, Horizontal Situation Indicator, Vertical Situation Indicator.

Preparations before an ILS/instrument landing is to setup the ILS frequency on your NAV1 radio, and the runway heading on your Course selector.

Normally an ILS glideslope have 3 degrees descending. It means, ATC will guide you to 2000 ft above ground, and approach will start about 7 nm far from runway. This is quite close. At this moment your gauges will already show you the centerline since 2-3 minutes.

ND: or more simply, the digital compass rose screen. On most panel you will se a purple/white  needle in the center. This will show you the longitudinal center of the ILS virtual line. If it is absolutely centered you are on the right vector. Normally inbuilt ATC will guide you to intercept the ILS glide slope with a last 30 degrees turn. Before reaching the correct heading, the purple line will be stand on one side of the display. As you reach the correct vector, the purple line will move to the center. In this moment start turning toward the correct heading, and with luck, you will hit the correct vector toward the runway. Try to keep the needle in center, against crosswinds, and your heading will be right for landing.

FD: mostly the LEFT digital screen, that contains the altitude and speed gauge too. This screen usually have 2/3 purple diamonds. To be easy, these diamonds show the ideal centers of every aspect of the glide slope and you must move your plane so the diamonds are centered on their slides. 1st is existed (not always) on the left side, next to the speed gauge. If it is vertically centered, your airspeed is OK. If it moves up, your speed is low, if it moves down your speed is high. 2nd is existed on the right side next to the altitmeter slide. If it is centered, you are on the slope, if it moves down then you are above glide slope, if it moves up then you are below glide slope. 3rd is existed on the bottom. It is the same as the needle mentioned at the compass rose. It will move left if you are right of the centerline, and moves right if you are left of the centerline.

ILS diamonds/needles pop up only if you setted the ILS frequency correctly, and you are about 20 nm far from the touchdown point. Near the touchdown point (100-200 ft high) it is better to change to visual approach, because your diamonds can screw up everything ;D

Safe landings ;) If you need more details, then you should really try the inbuilt flight trainer. The best excersice is to land a Cessna with ILS, in 0 visibility conditions ;D

EHM-0962 Zhen Yi:
Nice explanation by SirRoberto.....but isn't COM1 used for communication with the ATC and NAV1 for the ILS/Localiser etc? I'm not too sure about this cause i've not flown for months :P skills getting quite rusty

EHM-1001 Robert:
Arrrrgggggggggghhhh, what a mistake ;D

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