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Flashcards in ILS Deck (28)
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1

ILS frequencies between ... and ... 

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

2

Glidepath uses 40 spot UHF between 

329.3 MHz to 335 MHz

3

All marker beacons operate on ...MHz

75

4

One dot of localiser deviation = 

 

0.5 degrees

5

one dot of glideslope deviation = 

0.15 degrees

6

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

0.35 degrees

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)

left = 90

right = 150

8

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

300m

9

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

25NM

6000ft

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

10

25NM

35

17NM

11

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

18 NM

10 NM

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

5

precision approach

13

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

90hz

150hz

14

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

10NM

8 degrees

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

0.45

1.75

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

3.5

8

17

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

blue

400

dashes

2 dashes per second

18

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

amber

1300

dots and dashes

2 dashes and 6 dots per second

19

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

white

3000

dots

6 dots per second

20

Localiser captured before Glidepath, usually between ... and ... ft

2000

2500

21

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

200 ft

550m

22

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

100 ft

300m

23

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

0 ft

200m

24

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

0 ft

75m

25

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

0 ft

0m

26

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

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

looks like a yellow ladder

27

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

5 x groundspeed

5 x groundspeed x (GPA/3)

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

6

2