OGRAD 05.02 - Microwave Landing System (MLS) [ATPL]

Results

Q1. Which one of the following is an advantage of a Microwave Landing System (MLS) compared with an Instrument Landing System (ILS)?

It does not require a separate azimuth (localiser) and elevation (azimuth) transmitter

It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS

The installation does not require to have a separate method (marker beacons or DME) to determine range

There is no restriction on the number of ground installations that can be operated because there is an unlimited number of frequency channels available

It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS

Q2. The azimuth transmitter of a Microwave Landing System (MLS) provides a fan-shaped horizontal approach zone which is usually:

+or- 50° of the runway centre-line

+or- 40° of the runway centre-line

+or- 60° of the runway centre-line

+or- 30° of the runway centre-line

+or- 40° of the runway centre-line

Q3. MLS installations notified for operation, unless otherwise stated, provide azimuth coverage of:

+or- 20° about the nominal courseline out to a range of 10 NM

+or- 20° about the nominal courseline out to a range of 20 NM

+or- 40° about the nominal courseline out to a range of 30 NM

+or- 40° about the nominal courseline out to a range of 20 NM

Q4. In which frequency band does the Microwave Landing System (MLS) operate?

EHF

SHF

VHF

UHF

SHF

Q5. Which one of the following methods is used by a Microwave Landing System (MLS) to indicate distance from the runway threshold?

Timing the interval between the reception of sequential secondary radar pulses from the MLS station to the aircraft

Timing the interval between the transmission and reception of primary radar pulses from the aircraft to MLS station

Measurement of the frequency shift between the MLS azimuth and elevation transmissions

A DME co-located with the MLS transmitters

Q6. Which one of the following correctly lists the major ground based components of a Microwave Landing System (MLS)?

Combined azimuth and elevation transmitter, outer and inner marker beacons

Separate azimuth and elevation transmitters, outer and middle marker beacons

Combined azimuth and elevation transmitter, DME facility

Separate azimuth and elevation transmitters, DME facility

Q7. Compared to the ILS, MLS has the following advantages:

No special receivers are required in the aircraft

Many different approaches to the same runway may be defined by 1 set of ground equipment

Aircraft separation will automatically be arranged by the ground equipment

All approaches to all airfields will use the same channel, which means that the aircraft equipment will be a single-channel receiver

Many different approaches to the same runway may be defined by 1 set of ground equipment

Q8. The MLS use a technique based on

"Frequency Modulated Duplex"

"Pulse interrogation"

"Time Reference Scanning Beam"

"Analogue Scanning Beam"

“Time Reference Scanning Beam”

Q9. In an MLS the azimuth information is available in the approach sector

To a distance of 10 NM in an 80 degree wide sector

To a distance of 20 NM in an 80 degree wide sector

To a distance of 10 NM in a 110 degree wide sector

To a distance of 20 NM in a 40 degree wide sector

To a distance of 20 NM in an 80 degree wide sector

Q10. Making an MLS approach, the aircraft

Receives elevation information 2 times a second

Receives elevation information 13 times a second

Receives elevation information three times as frequent as azimuth information

Receives elevation and azimuth information 39 times a second