Comms

Question 1

Max theoretical range (nm)

Answer 1

Max theoretical range (nm) = 1.23 √H1 + 1.23 √H2 (ft)

Question 2

Speed of light:

Answer 2

3 x 10⁸ m²

162 000 nm/sec

Question 3

Emergency freqs

Answer 3

500 KHz (MF) International Distress Freq - old dinghy radios

2182 KHz (MF) International Distress Freq

121.5 MHz

243 MHz

406 MHz (ELTs)

Question 4

INMARSAT

Answer 4

4 x geostationary orbits

Provide cover 80°S to 80°N

1660.5 MHz UHF

Question 5

VHF Direction Finding

QTE

QUJ

QDR

QDM

Accuracy:

Class A

Class B

Class C

Class D

Answer 5

QTE True bearing from the station

(True Emission)

QUJ True bearing to the station

(Union Jack - lines converge!)

QDR Mag bearing from the station

(Direct Radial)

QDM Mag bearing to the station

Accuracy:

Class A +/-2º/5 nm

Class B +/-5º (most common)/20 nm

Class C +/-10º/50 nm

Class D >10º

Question 6

Radio Strength:

Answer 6

1: Perfectly readable
2: Readable
3: Readable but with difficulty
4: Readable now and then
5: Unreadable

Question 7

Aviation Radio Freqs

HF

VHF

Answer 7

HF: 2850 - 22000 KHz

VHF: 118 - 136.975 MHz

Question 8

Opening Hours

HJ:

HN:

HO:

Answer 8

HJ: sunrise to sunset

HN: sunset to sunrise

HO: by operational requirements

Question 9

Braking Action

Answer 9

0. 40 and higher: good
1. 36 to 0.39 medium to good
2. 30 to 0.35: medium
3. 26 to 0.30: medium to poor
4. 25 and below: poor

Question 10

Recommended Speech Rate:

Answer 10

100 words per minute

Question 11

ATC Suffixes

Area Radar

Radar (in general)

Single station covering Approaches and Departures

2 stations:

Answer 11

CONTROL: Area Radar

RADAR: Radar (in general)

APPROACH - single station covering Approaches and Departures

2 stations:

ARRIVALS

DEPARTURES

DELIVERY

Question 12

Loss of Comms

Answer 12

Set Mode A 7600

If under radar control, maintain current speed and last assigned level (or min. safe altitude if higher) for 7 minutes.

(20 mins from failure to report position at compulsory reporting point if outside radar cover)

(7 mins starts from when 7600 set, which should be as soon as comms failure detected)

If following SID and clearance to climb not given, follow SID and hold at last point of the procedure for the remaining portion of the 7 mins then follow current flight plan clearance.

If being radar vectored without a specified limit, set 7600 and rejoin current flight plan in the most direct manner, and NLT next significant point.

Question 13

QNH

QFE

Answer 13

QNH - barometric altitude that will cause the altimeter to read airfield elevation.

QFE - barometric altitude that will cause the altimeter to read zero at the airfield reference datum.

Question 14

Runway Braking Action

Unreliable:

Answer 14

Runway Braking Action

Unreliable - measuring equipment does not work properly in wet snow or slush.