ILS

Question 1

ILS frequencies between … and …

Answer 1

between 108 and 112 MHz only on odd 100 KHZ and odd 100 KHz plus 50 KHz

Question 2

Glidepath uses 40 spot UHF between

Answer 2

329.3 MHz to 335 MHz

Question 3

All marker beacons operate on …MHz

Answer 3

75

Question 4

One dot of localiser deviation =

Answer 4

0.5 degrees

Question 5

one dot of glideslope deviation =

Answer 5

0.15 degrees

Question 6

One dot of glidepath deviation on a 2-dot EFIS display =

Answer 6

0.35 degrees

Question 7

Localiser consists of two overlapping beams, left one amplitude modulated at … Hz and the right one at … Hz (left and right relative to direction of approach)

Answer 7

left = 90

right = 150

Question 8

Localiser aerial is usually in line with the runway centre line and what distance off the upwind end?

Answer 8

300m

Question 9

Localiser signals protected to a range of … and … height, beyond which the signal may be received but not relied upon

Answer 9

25NM

6000ft

Question 10

Coverage extends to … degrees either side of the centre line out to … range but increases to … degrees either side when within … range

Reverse sense indications may occur outside of the coverage area

Answer 10

10

25NM

35

17NM

Question 11

Where terrain gets in the way, coverage distances can be reduced to … with the 10 degree coverage and … elsewhere

Answer 11

18 NM

10 NM

Question 12

Sometimes the localiser aerial cannot be sited on the runway centreline upwind and must be placed next to the runway. The beam is then adjusted to cross the centreline at the decision height and the localiser is said to be offset.

If the offset is greater than … degrees the installation no longer qualifies as a …, in which case all approaches must be flown down to MDA/MDH and not decision height

Answer 12

5

precision approach

Question 13

Glidepath beams amplitude modulated at … and … above and below respectively

Answer 13

90hz

150hz

Question 14

Coverage of glidepath extends to …NM and … degrees either side of the centre line

Answer 14

10NM

8 degrees

Question 15

Glidepath beams do not go all the way down to the surface

Bottom of the lower lobe is at … x GP angle

Top of upper lobe is at … x GP angle

Answer 15

0. 45
1. 75

Question 16

A Glidepath steeper than … degrees is known as a steep approach and limits of coverage remain the same but now only extend to … NM

Answer 16

3.5

8

Question 17

Outer marker coloured … with a …hz pitch and an audio tone of … in morse at a rate of … per second

Answer 17

blue

400

dashes

2 dashes per second

Question 18

Middle marker coloured … with a pitch of …Hz and … in morse at a rate of … per second

Answer 18

amber

1300

dots and dashes

2 dashes and 6 dots per second

Question 19

inner marker coloured … with a pitch of …hz and … in morse at a rate of … per second

Answer 19

white

3000

dots

6 dots per second

Question 20

Localiser captured before Glidepath, usually between … and … ft

Answer 20

2000

2500

Question 21

Cat I minimum descent height is … on the baro altimeter and minimum RVR is …

Answer 21

200 ft

550m

Question 22

Cat II minimum descent height is … on the rad alt and minimum RVR is …

Answer 22

100 ft

300m

Question 23

Cat IIIA minimum descent height is … on the rad alt and minimum RVR is …

Answer 23

0 ft

200m

Question 24

Cat IIIB minimum descent height is … on the rad alt and minimum RVR is …

Answer 24

0 ft

75m

Question 25

Cat IIIC minimum descent height is … on the rad alt and minimum RVR is …

Answer 25

0 ft

0m

Question 26

What are CAT II & III holding points for and what do they look like?

Answer 26

used to hold aircraft on taxiways outside of the ILS sensitive area

looks like a yellow ladder

Question 27

rate of descent formula for 3 degree glideslope and any other glideslope angle?

Answer 27

5 x groundspeed

5 x groundspeed x (GPA/3)

Question 28

CAT I systems cut out … seconds after ground equipment monitoring detects a fault

CAT II and III systems cut out … seconds after a fault

Answer 28

6

2