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Module 13 > Comms and Nav Q's > Flashcards

Comms and Nav Q's Flashcards

1
Q

What is the purpose of the VHF system?

A

For short range communications

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2
Q

What is the frequency range of VHF communications?

A

118 - 136.975 Mhz AM

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3
Q

Whats is the channel spacing of VHF?

A

25Mhz - 760 Channels or 8.33 Mhz 2280 Channels

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4
Q

In VHF is it possible to communicate in duplex mode?

A

No

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5
Q

How do you change RX to TX in VHF?

A

By selecting the PTT button

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6
Q

How is the operation frequency tuned?

A

Tunes using the knobs on the VHF control panel

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7
Q

The VWSR shows more than 2.0 what does this mean?

A

There is a problem with the antenna tuning circuit.

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8
Q

What is the purpose of the HF system?

A

Long distance voice communications between aircraft and ground.

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9
Q

What is the frequency range of HF communications?

A

2-29.999 Mhz AM

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10
Q

The HF system will work in what modulation modes?

A

AM and SSB ( Upper side band)

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11
Q

What is the channel spacing in the HF system?

A

1Khz / 28000 Channels

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12
Q

What is the task of the antenna coupler and where is it located?

A

It is matched to the transmission frequency to tune to the minimum standing wave ratio

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13
Q

In receive mode is it necessary to tune the antenna circuit?

A

Yes

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14
Q

How is the antenna tuning mode indicated to the pilots?

A

The TIP or tune in progress indication will appear

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15
Q

What is the purpose of the SELCAL system?

A

It provides aural and visual indications of the calls received from ground stations quipped with a coding device.

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16
Q

What communications systems are used for SELCAL?

A

VHF and HF

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17
Q

What is the function of a SELCAL decoder?

A

It will compare the code activated on the code select panel to the code being received.

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18
Q

How is a SELCAL call indicated in the flight deck?

A

A buzzer and the call legend flashes amber.

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19
Q

Where is the SELCAL code selected?

A

The SELCAL code is selected on the code selection panel, there a re 4 code select wheels using 17 binary wires.

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20
Q

What is the purpose of the SATCOM system?

A

Long range communication using the Satellite network, Ground earth station and Aircraft earth station.

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21
Q

How is a call processed between and aircraft and the office?

A

Aircraft transmits to the satellite and the satellite transmits this back to the GES where it travels through a network to the airline computer

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22
Q

How many satellites are used by IMMERSAT?

A

4 satellites and ten ground stations

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23
Q

In SATCOM which unit has control over the whole system?

A

The satellite data unit (SDU)

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24
Q

The SATCOM uses position and attitude signals why?

A

Because the beam from the antenna must be pointed directly at the satellite.

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25
Q

Does SATCOM operate in simplex or duplex mode?

A

The RFU ensures the system works in complete duplex mode.

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26
Q

What is the Uplink/Downlink frequency between AES and satellite?

A

1.5/1.6 Ghz

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27
Q

What is the Uplink/Downlink frequency between GES and satellite?

A

4-6 Ghz

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28
Q

What is the purpose of the ACARS system?

A

The ACARS system is used to TX or RX automatically generated reports to or from a ground station.

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29
Q

Which aircraft communication system will broadcast ACARS messages?

A

VHF or SATCOM

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30
Q

What are the 4 ACARS providers?

A

SITA, Arinc, Air Canada and AVICOM

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31
Q

What is the ACARS frequency in Zurich?

A

131.725 Mhz

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32
Q

OOOI Stands for?

A

Out, Off-, On- and In Event

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33
Q

What are the two technologies used for Audio Integrating?

A

Analogue and Digital

34
Q

What does switching the voice/ident switch do?

A

Voice - Only voice will be heard

Ident - voice and full identification will be heard

35
Q

What does the filter inside a ACP do?

A

It cancels the morse code 1020Hz and is made up of dependant elements like coils and capacitors

36
Q

Which function is now digitally controlled in a digital ACP?

A

Volume is now controlled with the use of potentiometers

37
Q

What is the function of the RAD/INT switch located on the ACP or side stick?

A

RAD - Connects Boom/Mask to the radio

INT - Connects Boom/Mask to the flight interphone system

38
Q

The flight interphone is used to communicate between?

A

Between the flight deck themselves and flight deck and ground crew when starting engines

39
Q

The cabin interphone is used to communicate between?

A

Between the cabin and the flight deck

40
Q

The service or maintenance interphone is used for communication between?

A

maintenance personal during maintenance activities

41
Q

What is the main component in each interphone system?

A

Amplifier

42
Q

To communicate from inside the cabin the attendant has to use?

A

Cabin Handsets

43
Q

How is the ground engineer called from the cockpit to communicate?

A

A horn in the nose wheel bay

44
Q

Is it possible to communicate between the different interphone systems?

A

Yes and there are switches to do so

45
Q

What is the purpose of the CVR

A

To determine the cause of an aircraft accident by recording on an endless tape for a minimum of 30 mins.

46
Q

What is the CVRs recording capacity?

A

At least 30 mins on 4 channels

47
Q

On a CVR channels 1-4 what are their sources?

A

1 - Captins Audio
2 - FO Audio
3 - Observers
4 - Cockpit Area

48
Q

What is the recording media of a CVR?

A

endless magnetic tape or Solid state memory.

49
Q

When is the CVR powered?

A

When one of the engines is started (fuel levers open) on manually through the CVR/FDR gnd cont pushbutton switch.

50
Q

When can the CVR data be erased?

A

When the aircraft is on the ground and the parking brake is set.

51
Q

The ULB is provided to?

A

Generate a pulse when immersed in water

52
Q

What kind of signal does the ULB send out and for how long?

A

A 37.5Khz acoustic signal and operates continually for 30 days.

53
Q

When must the internal battery of a ULB be replaced?

A

2-6 years

54
Q

What is the purpose of an ELT?

A

A self contained radio transmitter with an inertia switch inside that operates at around 5G.

55
Q

What signals does an ELT transmit?

A

121.5 Mhz in the VHF band and 243.0 Mhz in the UHF band

56
Q

How long with the ELT transmit for?

A

48 hours

57
Q

How is the ELT powered?

A

By an internal battery pack

58
Q

what is the new third frequency added to the ELT operation?

A

406Mhz

59
Q

What are the components in a HF system?

A

HF transceiver, Antenna, Antenna coupler, HF Mode control panel, MIC, Headphones

60
Q

The ADF system shows a direction towards a?

A

Non Directional Beacon

61
Q

Name the 2 antennas that are used in ADF?

A

Omnidirectional sense antenna and 2 Loop Antennas

62
Q

How many Nulls are there when a loop antenna is rotated in a radio field?

A

2 Nulls

63
Q

What is the frequency range for ADF?

A

190 - 1750 Khz

64
Q

What is the indicator in the flight deck that shows ADF direction?

A

Radio Magnetic Indicator

65
Q

What is the heading or reference line known as?

A

Lubber Line

66
Q

What is the name of the ADF direction?

A

QDM or Direction Magnetic

67
Q

What is relative bearing?

A

Angle from the aircraft heading to the pointer

68
Q

What is absolute bearing?

A

Absolute bearing is with respect to north going clockwise.

69
Q

What 2 functions does VHF Navigation comprise of?

A

VOR and ILS

70
Q

What is TCAS I?

A

Provides proximity warning codes, to assist the pilot in visual acquisition of intruder aircraft. Intended for use by smaller and general aviation aircraft.

71
Q

What is TCAS II?

A

Provides traffic advisories and resolution advisories in a vertical direction to avoid conflicting traffic. AC and larger commuters will use this

72
Q

What is TCAS III?

A

Still under development, will provide traffic advisory and resolution in the horizontal as well as vertical directions.

73
Q

What does the TCAS computer communicate with on an intruder aircraft?

A

Transponder

74
Q

What can a TCAS computer calculate from an aircrafts transponder?

A

Its bearing, range and closure rate and its relative altitude (ATC mode C or S)

75
Q

TCAS transmits on ………… and receives on 1090 Mhz?

A

1030 and 1090Mhz

76
Q

Describe the TCAS antenna?

A

Low profile, 4 element directional devices capable of TX in 4 stable directions and receiving Omni baring information.

77
Q

What does a TA (traffic advisory) provide?

A

Assists the pilot to make a visual search. An arrow in the indicator shows if the aircraft is climbing or descending.

78
Q

What does a RA (Resolution Advisory) provide.

A

It shows the pilot the vertical speed or corrective action to prevent a collision.

79
Q

Below 500 feet rad alt all RA in TCAS are?

A

Supressed.

80
Q

How is a Resolution Advisory indicated?

A

Red and Green segments which can illuminate instead of normal vertical speed indication.

81
Q

What information does the GPS receiver receive?

A

3D position, velocity and time information.

Module 13 (22 decks)

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