ILS

Question 1

Frequency for the Localizer?

Answer 1

VHF 108 - 112 MHz with odd decimals

Question 2

Frequency for the Glideslope?

Answer 2

UHF 329.15 - 335 MHz

Question 3

Where is the localizer aerial positioned?

Answer 3

300m from the end of the other runway end

Question 4

Where is the glideslope aerial positioned?

Answer 4

300m from the landing threshold and 150m to the side

Question 5

What is the principle of operation for the LOC and GP?

Answer 5

Transmitts two lobes. 90/150 Hz
LOC: 90 is left and 150 is right
GP: 90 is up and 150 is down

Question 6

What is the coverage of the LOC signal in distance and degrees?

Answer 6

35 deg out to 17 nm
10 deg out to 25 nm
7 deg in elevation

Question 7

Max deflection of the localizer needle?

Answer 7

2,5 degrees

Question 8

Describe the signal protection and checks for the localizer

Answer 8

Signal protection out to 25 nm up to 6’250 ft

Question 9

Coverage of the glideslope?

Answer 9

8 degrees out to 10 nm
Elevation: Lower is 0,45 x GP
Upper is 1,75 x GP

Question 10

Full deflection of the GP needle?

Answer 10

0,7 degrees

Question 11

Where does the false GP beam exist?

Answer 11

At about 6 degrees

Question 12

Describe the LOC/GS monitoring criteria.

Answer 12

1. LOC shift more than 35 ft (CAT I), 25 ft (CAT II), 10 ft (CAT III)
2. GP shift: GP x 0,075
3. 50% power reduction

Question 13

What errors are associated with ILS beams?

Answer 13

Bending or scalloping

Question 14

What is the procedure to intercept the glideslope from above?

Answer 14

Be established on LOC in CONF 2 + Gear DN
Press APPR pb
Set FCU Alt above aircraft altitude
Select V/S 1500 fpm or more. Max 2000 fpm
Set go-around alt when GS* engages