NDB Training 🚨

Question 1

What does ADF stand for?

Answer 1

Automatic Direction Finder

Question 2

Where is the ADF antenna located on the DA62 and what shape is it?

Answer 2

Underside (in line with the wings), teardrop

Question 3

What is the maximum allowable uncertainty for bearing error on an NDB?

Answer 3

±2°

Question 4

What is the tolerance for oscillations on an NDB within the DOC and on Airways?

Answer 4

±10°

Question 5

What is the minimum power density for an NDB?

Answer 5

-108dBW/m²

Question 6

What is the full scale deflection on the aircraft CDI in degrees?

Answer 6

10°

Question 7

What frequency band do NDBs operate on?

Answer 7

190kHz - 1750kHz

(Annex 10 - P68, 3.4.4.1)

Question 8

If there is a sine wave in the graphic, what could be wrong in the site file?

Answer 8

Antenna coordinates

Question 9

What is QDM?

Answer 9

Magnetic bearing TO the station

Question 10

What is QDR?

Answer 10

Magnetic bearing FROM the station

Question 11

What 4 things must be done following a calibration?

Answer 11

Data files copied to server
Engineers contacted
Provisional report sent
Teams logbook completed

Question 12

When should you check an NDB IDENT?

Answer 12

Every 1/4 of the orbit
Furthest point on each radial

Question 13

How does prop mod affect an NDB?

Answer 13

It doesn’t

Question 14

What are the airspeed limits for an NDB orbit (profile 30)?

Answer 14

160kts ±30kts

(FIP25 - P7, 7.1.1)

Question 15

Are NDB profiles flown at height or altitude?

Answer 15

Altitude

Question 16

Should NDB site files include magnetic variation?

Answer 16

No, they do not give bearing information to the aircraft, that is given by the aircraft’s ADF antenna. Therefore magnetic variation is irrelevant.

Question 17

What distance would be flown on a full NDB orbit at 20NM?

Answer 17

Circumference = πD
π x 20 x 2 = 125.66NM

Question 18

What are the two parts of an ADF antenna?

Answer 18

Sense - Non directional
Loop - Direction

Question 19

Do ADF receivers have a flag to show no/poor signal?

Answer 19

No

Question 20

What are the two modes which affect the receive range of an ADF?

Answer 20

ANT/REC - Higher range, no direction, can ID
ADF - Lower range, direction finding

(https://youtu.be/QQitucLrC8U?si=Vv8qq_r0aC_0reIQ)

Question 21

What range should an NDB function to?

Answer 21

DOC found in the AIP. Dependant on the station and its categorisation.

Question 22

What is the tolerance for oscillations on an NDB in holding patterns and on instrument approach procedures?

Answer 22

< ±5°

Question 23

In what direction is the bearing information of an NDB produced?

Answer 23

NDBs do not produce bearing information.

Question 24

What are the airspeed limits for an NDB radial (profile 31)?

Answer 24

160kts ±30kts

Question 25

What is the pilot accuracy tolerance for range variation on an NDB **orbit** (profile 30)?

Answer 25

2 dots (0.1NM)

Question 26

What is the pilot accuracy tolerance for altitude on an NDB **orbit** (profile 30)?

Answer 26

Required feet ±50ft

Question 27

What is the maximum heading change rate on an NDB **orbit** (profile 30)?

Answer 27

5° every 10 seconds

Question 28

What is the pilot accuracy tolerance for radial deviation on the centre screen for an NDB **radial** (profile 31)?

Answer 28

1 dot

Question 29

What is the maximum heading change rate on an NDB **radial** (profile 31)?

Answer 29

5° every 10 seconds

Question 30

What is the pilot accuracy tolerance for altitude on an NDB **radial** (profile 31)?

Answer 30

Required feet ±50ft

Question 31

What parameters are mesaured on an NDB **orbit** (profile 30)?

Answer 31

Bearing error, IDENT, voice (if applicable), RF level

Question 32

What parameters are measured on an NDB **radial** (profile 31)?

Answer 32

Bearing error, IDENT, voice (if applicable), station passage (if applicable), RF level

Question 33

What profiles are required for an overseas NDB inspection (assume requirements from ICAO 8071)?

Answer 33

Orbit to check for coverage on both TX Station passage radial on either TX Approach radials on either TX Any other radials listed in AIP or from customer requirements on either TX ## Footnote (FIP24 - P4, 4.4)

Question 34

True or false: The radius of the polar diagram of the sense antenna equals the diameter of each side of the loop antenna?

Answer 34

True ## Footnote (https://youtu.be/QVXg4FpHWDU?si=fYMVutjlWR5TL8AR)

Question 35

What causes the null point at the side of a loop antenna?

Answer 35

When the loop antenna is at 90° or 270° to the NDB, the phase at each side of the antenna is equal, creating a null point where direction can not be determined. ## Footnote (https://youtu.be/QVXg4FpHWDU?si=fYMVutjlWR5TL8AR)

Question 36

What does IAP stand for?

Answer 36

Instrument Approach Procedure

Question 37

What aircraft instrument will provide bearing information produced by an ADF?

Answer 37

RMI (Radio Magnetic Indicator) or RBI (Radio Bearing Indicator)

Question 38

What should you pay particular attention to when flying an NDB orbit (profile 30)?

Answer 38

Yaw (drift angle)

Question 39

What should you specifically check for when flying a station passage radial on an NDB (profile 31)?

Answer 39

The ADF needle flips by 180° on the RMI

Question 40

What is the frequency of modulation of an NDB signal?

Answer 40

Either 400Hz or 1020Hz