1. ADF & NDB's

Question 1

What is the ADF Formula?

Answer 1

H +- A = T (The HAT Trick)

Question 2

What frequency range does the NDB operate in?

Answer 2

200-400 kHz

Question 3

Is the range of an NDB better or worse over water?

Answer 3

Better

Question 4

Is the range of an NDB better or worse over mountain terrain or dry sandy country?

Answer 4

Dry sandy Country is better

Question 5

Where can you find the range of NDBs?

Answer 5

ERSA

Question 6

What is the range of the NDB below?

What is different about this NDB?

Answer 6

• The range varries dependant on the direction you are approaching from
• 30nm but reduced to 15 nm in sections

Question 7

The range of the NDB is consistent over water or over terrain?

Answer 7

Over water

Question 8

The range of the NDB relative to aircraft height is highly variable over water or over terrain?

Answer 8

Over Terrain

Question 9

Which NDB are you as a pilot expected to use?

Answer 9

The closest NDB in range

Question 10

Do NDBs have increased or reduced range at night?

Answer 10

Reduced range at night

Question 11

What is the “Thunderstorm Effect”

Answer 11

• Radio signals generated by thunderstorms affecting the net signal received by the ADF receiver.
• This causes major interference with NDB signals

Question 12

When does mountain effect on NDB decrease?

Answer 12

This effect decreases with increased height

Question 13

What is coastal refraction in relation to the NDB?

Answer 13

When there is an abrupt change in the medium i.e ocean to ground the radio wave can bend

Question 14

Using the HAT trick:

HDG:220°

ADF:010°

What is the TMG?

Answer 14

230°

Question 15

FPT = 090°

HDG=085°

ADF=176°

Find

TMG

TE

Drift

Answer 15

TMG=081°

TE=9°

Drift=4°L

Question 16

Present HDG = 110°

ADF Indictaion= 350°

FPT = 115°

Intercept Angle = 60°

FIND

HDG Required to intercept =

ADF indication once intercepted =

Answer 16

HDG Required to intercept = 055°

ADF at intercept = 060°

Question 17

Present HDG = 300°

ADF Indictaion= 195°

FPT = 330°

Intercept Angle = 60°

FIND

HDG Required to intercept =

ADF indication once intercepted =

Answer 17

HDG Required to intercept = 030°

ADF at intercept = 120°

Question 18

Present HDG = 175°

ADF Indictaion= 190°

FPT = 200°

Intercept Angle = 30°

FIND

HDG Required to intercept =

ADF indication once intercepted =

Answer 18

HDG Required to intercept = 230°

ADF at intercept =135°

Question 19

What is the formula for 1-in-60 Radio Nav

Answer 19

a=60d/D

Question 20

What is the formula to calculate nm for a NULL procedure?

Answer 20

mins flown x GS / Degrees of change

Question 21

What is the formula to calculate mins to intercept NDB for a NULL procedure?

Answer 21

mins flown x GS / Degrees of change = Miles to NDB

THEN

Take adjust NM to GS to get mins

Question 22

TRUE/FALSE: The NDB is a signal that is transmitted in equal strengths in all directions?

Answer 22

TRUE

Question 23

What is the formula for a wave?

Answer 23

Question 24

A VHF frequency of 124MHz has a wavelength of what?

Answer 24

2.42m

Question 25

You Are flying from Hamilton Island to Cairns. What is the rated coverage for Townsville

Answer 25

170nm ( you are obviously flying over water from Hamilton island)

Question 26

If a right crosswind is present and a pilot maintains 000° on the ADF towards the NDB: what will occur to the aircraft in regards to flight path?

Answer 26

The aircraft will take longer as it will now fly a curved path to the NDB and arrive into the wind.

Question 27

Why do some NDBs have reduced coverage at night?

Answer 27

The radio waves are reflected by the ionosphere at night

Question 28

What is a positive fix defined as? (hint AIP ENR 1.1)

Answer 28

1. Passage over RADIO Nav 2. The intersection of 2 or more not less than 45° - If using 2 NDBs must be within 30nm

Question 29

If using 2 NDBs to gain a positive fix what range must they both be in?

Answer 29

30nm

Question 30

When using Radio Nav equipment you must make an allowance of tracking errors of how many degrees? (AIP ENR 1.1)

Answer 30

9°

Question 31

Which is faster? Ground waves Sky Waves

Answer 31

Ground waves (sky waves bounce off the atmosphere and then must travel further at the same speed.