Instrument Landing System (ILS) - Ch 6 Flashcards Preview

Radio Nav > Instrument Landing System (ILS) - Ch 6 > Flashcards

Flashcards in Instrument Landing System (ILS) - Ch 6 Deck (19):
1

ILS General Info

Precision Instrument
VHF 108-112MHZ with odd numbers after decimal

2

ILS Components

Localiser (lateral)
Markers
Glide Slope (Vertical)
DME co-located (markers if not)

3

Localiser Signal

Low 90MHZ Left
High 150MHZ Right (when right of CL = Fly Left)

When difference: Depth of Modulation = same = you are on CL

4

Coverage

17nm Out 35 degrees

25nm Out 10 degrees

Protected Area

5

Deviation

Each Line = 0.5 degrees

Full Deflection = 2.5 degrees

6

Side Lobes

Transmitted out from main lobes - errors of radar

7

Back Beam

Reverse Indication: only used if programmed into FMC

8

Glide Path General

UHF - 90HZ Lobe (light) High
150HZ Lobe (heavy) low

9

Glide Path Deviation

Deviation Dot = 0.14 degrees

Full deflection = 0.7

10

Glide PAth Antenna

300m from RW threshold

11

Glide Path Coverage

3 degrees is standard

Height = 3x distance

Up to 10 miles

Normal Range 1.35 - 5.25

Intercept from below

12

Glide Path Performance

Within half a scale deflection and remaining within half a scale or abort

13

ILS Frequency

Localiser: VHF 108-111.95MHZ (odd)

Glide Path: UHF 328.6 - 335.4MHZ

14

ROD Calculation

ROD = (Theta x Groundspeed (nm/min)) x 100

15

Height Passing Calculation

= (theta x range from touchdown(nm)) x 100

16

Monitoring

Ground equipment is continuously automatically checking itself,

If fault= remove ident, cease transmission, beam bar + Glide slope disappear, flag warning ATC

17

Interference

Scalloping: night effect - due to changing density

18

LVP Critical Area

Vehicles and AC are excluded from moving

19

LVP Sensitive Area

Vehicle/AC movements are controlled