Microwave Landing System

Question 1

MLS was designed for

Answer 1

To replace ILS with an advanced precision approach

Question 2

How many channels in MLS

Answer 2

200 channels

Question 3

What frequency does MLS operate in

Answer 3

SHF band - 5031/5090 MHZ

Question 4

Advantages of MLS

Answer 4

200 channels
Not limited to straight in approaches
Can operate from unprepared/hilly sites
No multi path interference
Built in DME

Question 5

How does MLS Work

Answer 5

To/From Sweeping beam - Time reference scanning beam
Difference between TO scan and FROM scan calculated and ac position can be determined

Referred to as time multiplexed

Question 6

MLS Coverage

Answer 6

40 degrees either side of the centreline extending to 20nm

Question 7

DME/P and MLS

Answer 7

DME/P required for segmented approaches (curved). If not installed or active only straight line approaches can be flown similar to ILS

Question 8

How can a MLS be identified

Answer 8

4 letter Morse code at 10 second intervals

Question 9

Multi mode Receiver

Answer 9

Enable use of multiple nav aids - ILS/MLS/GNSS

+ reduces training costs

Question 10

What information is displayed to the pilot using a MLS

Answer 10

2D presentation of a 3D segmented approach