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IREX > 1. ADF & NDB's > Flashcards

1. ADF & NDB's Flashcards

1
Q

What is the ADF Formula?

A

H +- A = T (The HAT Trick)

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2
Q

What frequency range does the NDB operate in?

A

200-400 kHz

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3
Q

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

A

Better

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4
Q

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

A

Dry sandy Country is better

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5
Q

Where can you find the range of NDBs?

A

ERSA

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6
Q

What is the range of the NDB below?

What is different about this NDB?

A
  • The range varries dependant on the direction you are approaching from
  • 30nm but reduced to 15 nm in sections
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7
Q

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

A

Over water

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8
Q

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

A

Over Terrain

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9
Q

Which NDB are you as a pilot expected to use?

A

The closest NDB in range

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10
Q

Do NDBs have increased or reduced range at night?

A

Reduced range at night

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11
Q

What is the “Thunderstorm Effect”

A
  • Radio signals generated by thunderstorms affecting the net signal received by the ADF receiver.
  • This causes major interference with NDB signals
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12
Q

When does mountain effect on NDB decrease?

A

This effect decreases with increased height

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13
Q

What is coastal refraction in relation to the NDB?

A

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

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14
Q

Using the HAT trick:

HDG:220°

ADF:010°

What is the TMG?

A

230°

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15
Q

FPT = 090°

HDG=085°

ADF=176°

Find

TMG

TE

Drift

A

TMG=081°

TE=9°

Drift=4°L

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16
Q

Present HDG = 110°

ADF Indictaion= 350°

FPT = 115°

Intercept Angle = 60°

FIND

HDG Required to intercept =

ADF indication once intercepted =

A

HDG Required to intercept = 055°

ADF at intercept = 060°

17
Q

Present HDG = 300°

ADF Indictaion= 195°

FPT = 330°

Intercept Angle = 60°

FIND

HDG Required to intercept =

ADF indication once intercepted =

A

HDG Required to intercept = 030°

ADF at intercept = 120°

18
Q

Present HDG = 175°

ADF Indictaion= 190°

FPT = 200°

Intercept Angle = 30°

FIND

HDG Required to intercept =

ADF indication once intercepted =

A

HDG Required to intercept = 230°

ADF at intercept =135°

19
Q

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

A

a=60d/D

20
Q

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

A

mins flown x GS / Degrees of change

21
Q

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

A

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

THEN

Take adjust NM to GS to get mins

22
Q

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

A

TRUE

23
Q

What is the formula for a wave?

A
24
Q

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

A

2.42m

25
Q

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

A

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

26
Q

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?

A

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

27
Q

Why do some NDBs have reduced coverage at night?

A

The radio waves are reflected by the ionosphere at night

28
Q

What is a positive fix defined as?

(hint AIP ENR 1.1)

A
  1. Passage over RADIO Nav
  2. The intersection of 2 or more not less than 45°
    - If using 2 NDBs must be within 30nm
29
Q

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

A

30nm

30
Q

When using Radio Nav equipment you must make an allowance of tracking errors of how many degrees?

(AIP ENR 1.1)

A

9°

31
Q

Which is faster?

Ground waves

Sky Waves

A

Ground waves

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

IREX (2 decks)

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