BGS post its - RNAV

Question 1

What is the beat frequency oscillator on an ADF used for?

Answer 1

Hearing the IDENT of some NDBs

Question 2

How many atomic clocks are there on a NAVSTAR GPS satellite?

Answer 2

4

Question 3

What does a single bright line on an AWR screen mean?

Answer 3

The cathode ray tube is faulty.

Question 4

What should a controller see for ATS surveillance?

Answer 4

a map overlay

A/C identification and FL

Question 5

How are antennas on modern AWR stabilised?

Answer 5

with inputs from the A/C attitude system (INS/IRS/VRGU)

Question 6

What is the path delay of GPS signals in earth atmosphere proportional to?

Answer 6

the inverse of carrier frequency squared

Question 7

What part of ILSs are protected from interference by FM immunity filters?

Answer 7

the localiser

Question 8

What is scalloping?

Answer 8

a phenomenon which causes a CDI to deviate from side to side due to signal errors

Question 9

when on a back course how will OBIs and HSIs sense?

Answer 9

an OBI will always reverse sense but a HSI will sense correctly if front course is set

Question 10

What kind of nav aid can TACANs provide?

Answer 10

They can provide DME to civil A/C but also VOR to military A/C

Question 11

What is the full scale deflection on a CDI for ILS localiser and glideslope?

Answer 11

localiser - 2.5deg

glideslope - 0.7deg

Question 12

what is the minimum number of ground stations to give range & bearing information in DF?

Answer 12

2

Question 13

How many times and on what frequency will VOR and DME idents be heard per second with VOR/DME colocation?

Answer 13

VOR - 3 times at 1020hz

DME - 1 time at 1350hz

Question 14

What does the DME display counter rotating about its full range indicate?

Answer 14

It is conducting a range search.

Question 15

What mode must a SSR unit be in to transmit mode A, C or S?

Answer 15

ALT

(ON is for mode A only)

Question 16

What is quadrantal error of an ADF caused by?

Answer 16

refraction from A/C fuselage

Question 17

What can be said about the azimuth and elevation transmitters of a MLS?

Answer 17

they operate on a shared frequency.

Question 18

What is the coverage of the approach zone for MLS systems?

Answer 18

+/- 40deg of the rwy centre line out to 20nm

Question 19

What is the coverage of the approach zone in elevation for MLS systems?

Answer 19

0.9deg to 20deg out to 20nm

Question 20

Where are glidepath antenna located?

Answer 20

at the side off the runway approximately 300m beyond the threshold

Question 21

What part of EM waves are polarised?

Answer 21

the electrical part.

Question 22

Are ATC frequencies contained in the navigation database?

Answer 22

no

Question 23

When does DME interoogation begin?

Answer 23

Once the first pulse paris of the tuned DME have been recieved

Question 24

Upon losing signal of an SBAS signal (EGNOS) how long would it take for an indication to show up?

Answer 24

6 seconds

Question 25

what is search the sky mode for GPS?

Answer 25

a procedure that starts after switching on if there is no stored satellite data available.

Question 26

What additional system does an FMS need to control vertical position?

Answer 26

Autothrottle

Question 27

What can VDF provide?

Answer 27

QDM or QTE

Question 28

When will ETOs and ETAs at destination computed by an FMS be correct?

Answer 28

if actual wind = forecast wind if actual speed = FMC calculated speed

Question 29

What should the accuracy of GPS be?

Answer 29

13m horizontal 22m vertical 95% of the time

Question 30

what does the 2000 SSR code mean?

Answer 30

entering the airspace from area where SSR operation has not been required (oceanic)

Question 31

What kind of modulation do HF and VHF comms broadcasts have?

Answer 31

AM

Question 32

Out of VHF and HF which one is SSB?

Answer 32

HF

Question 33

What part of the VHF comms signal contains the information being transmitted?

Answer 33

the sidebands.

Question 34

What are the order of accuracies for RNAV fixes?

Answer 34

GNSS IRS/INS DME/DME VOR/DME VOR/VOR

Question 35

What is the orientation and number of satellites for most accurate position fix?

Answer 35

3 satllites low to the horizon and 1 more directly overhead (tetrahedron)

Question 36

Are the clocks in GPS constellations synchonised?

Answer 36

no

Question 37

Are satellite clock time corrections contained in the navigation message sent to A/C from the satellite?

Answer 37

yes

Question 38

What is FADING?

Answer 38

essentially destructive interference between sky and ground waves due to night effect

Question 39

What is another way of saying pulse recurrence rate?

Answer 39

pulse recurrence frequency

Question 40

What affects a primary radars ability to discriminate between targets in azimuth?

Answer 40

beam width

Question 41

How is the doppler effect used in DVORs?

Answer 41

it is used to create a FM signal as received by an A/C and reduces siting error

Question 43

What does the MTR equation actually mean?

Answer 43

MTR is the range from LOS

Question 44

What is the purpose of AWR?

Answer 44

to detect precipitation usually accompanied by turbulence

Question 45

what is the A/C doing in DME tracking mode?

Answer 45

It is locked onto a DME and transmitting a relatively low number of pulse pairs per second

Question 46

When saturated, how will a DME decide which aircraft to prioritise?

Answer 46

those with the strongest signals

Question 47

How are VORTACs represented on the EFIS?

Answer 47

The same way a normal TACAN would be in GNAV

Question 48

Which DMEs will an FMS auto tune to?

Answer 48

The DMEs providing the best angular position lines for the RNAV system

Question 49

What is the coverage of GBAS systems?

Answer 49

+/- 35 deg out to 15nm +/- 10deg out to 20nm from threshold

Question 50

What is the datum used for MDA on a non-precision approach when using GPS?

Answer 50

barometric altitude

Question 51

What are the L1 and L2 frequencies and purposes of NAVSTAR?

Answer 51

L1 - 1575.42MHz - C/A & P (alies) L2 - 1227.6MHz - P

Question 52

What can the middle marker of DME be used for?

Answer 52

to indicate the position for a missed approach in a CAT 1 approach during poor vis.

Question 53

What are the marker distances for DME?

Answer 53

Inner - 100m Middle - 1000m Outer - 10km (8km)

Question 54

What does the gain control knob do on an AWR?

Answer 54

it adjusts the sensitivity of the receiver to achieve optimum target aquisition.

Question 55

How does MLS minimise multipath errors?

Answer 55

The signal is inturrupted when the scanning beam passes over known obstacles to avoid reflection

Question 56

How can a failure of VOR systems be recognised on an EFIS display?

Answer 56

The magenta indications are removed.