ILS

Question 1

On what frequencies are :
1-localisers
2-glideslopes

Answer 1

1-VHF from 108MHz to 111.95MHz
2-UHF from 329.3MHz to 335MHz

Question 2

On what principle does the ILS work

Answer 2

Difference in Depth of Modulation

Question 3

1-On what frequency and what colour are the 2 lobes transmitted with an ILS
2-what position are the 2 lobes

Answer 3

1-Yellow - 90Hz
Blue - 150Hz
2-Yellow left and up
Blue right and down

Question 4

What is the coverage of a 3° localiser at:
1- +- 10°
2- +- 35°

Answer 4

1-25nm
2-17nm

Question 5

With the ILS marker beacons, what does it indicate and what colour is:
1-A
2-O
3-M

Answer 5

1-airways, white
2-outer marker, blue
3-middle marker, amber

Question 6

What distance from the runway threshold is shown by:
1-the Outer marker
2-the middle marker
3-thr inner marker

Answer 6

1-3.5 - 5nm
2-3500ft
3-250ft

Question 7

What causes Scalloping and Bending of ILS signals

Answer 7

Buildings, vehicles, terrain, other transmitters

Question 8

What 2 parts of the ILS system utilize VHF

Answer 8

Localiser
Outer marker

Question 9

What part of the ILS does identification take place on

Answer 9

The localizer

Question 10

What is the max safe fly up deviation allowed with a 5 dot CDI

Answer 10

2.5 dots fly up