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Systems 3 > Communication Systems > Flashcards

Communication Systems Flashcards

1
Q

What are the main components of a communication system

A
  • VHF radio
  • UHF radio
  • HF radio
  • Controller (UFCP)
  • Intercom (ICS)
  • Transponder (including ADS-B)
  • ELT (emergency locator transmitter)
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2
Q

What are the 3 main frequencies and their bands

A 
HF = 3 - 30 MHz
VHF = 30 - 300MHz
UHF = 300 - 3000MHz
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3
Q

What are HF comms primarily used for and what is their range. And can it be used beyond line of sight?

A

Long range comms
1600km
Yes

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4
Q

What are average VHF comms distance at 1000ft and 10,000

A

30, 123 miles

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5
Q

What are the 3 main components of a typical VHF system

A

Transceiver
Controller
Antenna

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6
Q

What is the typical operating band of a UHF system

A

225 - 400 MHz

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7
Q

Is UHF AM or FM used by military?

A

Am

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8
Q

What are some functions a cockpit intercom provides

A
  • Voice comms between aircrew
  • Monitoring communications reciever audio
  • Monitoring navigation reciever audio
  • Selection of a comms system to transmit on
  • Audio control to transmitting comms system
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9
Q

What has the implementation of digital data allowed in modern aircraft

A

Allows multiple systems to communicate with eachother through a single interface
(UFCP)

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10
Q

What generally activates an emergency locator transmitter (ELT)

A

Ejection or excessive G

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11
Q

What is an ELT

A

Emergency battery powered transmitter

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12
Q

What does the PC21 communication system provide audio comms between and what is its secondary function

A
  • both pilots
  • pilot and ground crew
  • own aircraft and other aircraft
  • own aircraft and interrogators (ground or air)

2nd:
- Emergency transmission for aircraft location

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13
Q

What components does the comms system consisit of in the avionics bay

A
  • Audio managment unit (AMU)
  • UHF/VHF recievers
  • ELT
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14
Q

Where are the respective antennas for the comms system

A
  • Upper ATC/ ADS-B
  • UHF/ VHF 2
  • ELT
    All just forward of Vertical stabilizer
  • UHF/ VHF 1
    Below others, on underside
  • Lower ATC/ ADS-B
    Below wings
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15
Q

What does the UHF/VHF reciever guard do

A

Constantly monitors VHF & UHF guard frequencies 121.5 & 243 MHz

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16
Q

What 2 main components make of the ELT

A

Transmitter uni

Interface unit

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17
Q

What does the pc21 have to dissipate static charge and how many

A

Static discharges

21

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18
Q

How does static charge affect communications

A

It can disrupt LF reception or VHF interference

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19
Q

What are the 5 communication controls in the front cockpit

A
  • COMM panel on right console
  • Decouple panel above RH mfd
  • ELT remote control panel on rear of right console
  • PTT switch PCL
  • Instructor switch on left console
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20
Q

Where is communication system related data shown

A
  • UFCP
  • FMS
  • MFDs (both)
21
Q

What does the COMM 2 button on the decouple panel do

A

Allows instruction to transmit without student hearing

22
Q

What does the AMU control

A

UHF, VHF radios
Intercom
Aural warning tones

23
Q

Where does the AMU recieve inputs from

A

DWP

RIOCs 3 & 4

24
Q

What would cause damage to AMU WRT receiving and transmitting

A

If simultaneously transmitting and receiving occured on the same channel

25
Q

COMM 2 is identified as? and where is its antenna?

A

Transceiver 2

Forward of vertical stabilizer

26
Q

What are both transceivers controlled by

A

UFCP & FMS

27
Q

What are the selecatble frequencies on the UFCP

A

30 - 400 MHz

28
Q

Whats the transmitton range when using 400MHz band

A

100nm

29
Q

What powers each transciever, AMU & ATC/ ADS-B Transponder

A

COMM 1 = BATT BUS
COMM 2 = GEN 1 BUS
AMU = BATT BUS & GEN 1 BUS
Transponder = BATT BUS

30
Q

What happens when you press on the centre of the PTT switch on the plc

A

Mutes all incoming comms and radio nav audio signals to both pilots earphones

31
Q

Does pressing down on the ptt switch affect aural tones and volume

A

No

32
Q

What happens if the ptt switch is operated continuously for 45 seconds and why

A

Amu stops transition. In event of switch failure or of stuck in transmit position

33
Q

Can both pilots transmit simultaneously, if yes how

A

Yes

Only on seperate radios

34
Q

Where is the alternate ptt switch

A

Comm panel

35
Q

What else is on the comms panel

A

Event button

Amu channel selector

36
Q

How do you control comms volume

A

Rotary switch on ufcp

37
Q

With the MC powered and operating, the ATC transponder is controlled through what

A

UFCP

38
Q

What are the characteristics of transponder standby mode

A

Doesnt reply to interrogations
Doesnt broadcast any info
Will remain in standby after TO if not changed

39
Q

The transponder ON mode initiates ADS-B operation which has 3 modes, what are they

A

OFF
MIL (DEAFULT)
IFR

40
Q

If the MC fails, is switched off or UFCP fails, what controls the ATC transponder

A

FMS

41
Q

The ELT control switch has 3 positions, what are they. What position should the switch be on during normal operations

A

On
Armed
Test/ reset

Armed

42
Q

What are the consequences of a UFCP failure

A
  • COMM 1 & COMM 2 cant be controles through UFCP

- Loss of volume adjustment

43
Q

What systems are lost when MC fails

A
  • MFDs

- UFCPs

44
Q

What components are still functional

A

FMS
COMM PANEL
PPT switch on pcl

45
Q

How are radios controlled in the event of a MC failure

A

FMS

46
Q

What happens when amu 1 fails?

A

Amber AMU 1 FAIL on MFD
Attn gtr
Aural tone

47
Q

What failures would cause comms from front and rear cockpit and intercom to stop working completely . What would be associated warnings/ messages

A

Amu 1 - 3 fail
Amber on mfd
Aural
Attn gtr

48
Q

What indicates that the ELT is in transmit mode

A

Amber ELT ACTIVE on mfd
Attn gtrs
Aural tone
Test flash on ELT panel

Systems 3 (9 decks)

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