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Q400 > AC Communications > Flashcards

AC Communications Flashcards

1
Q

ARCDU?

A

Audio and radio control display unit

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2
Q

ARCDU 1 and 2 power source?

A

ARCDU 1 L essential & R main feeder bus

ARCDU 2 R essential & L main feeder bus

When essential bus fails then secondary power source takes over

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3
Q

ARCDU emergency what happens to the power source if main and ess buses are lost?

A

Emergency lights relay changed power source for ARCDU 1 from L ess to the battery bus.
Battery bus then supplied 28V DC power to pilots audio card, PA amplifier, FA handset and ARCDU 1

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4
Q

INT intercom “FAIL” message on the ARCDU means?

A

There has been a communication problem between ARCDU and remote control audio unit. The ARCDU will switch to preprogrammed config

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5
Q

ARCDU automatic reconfiguration what can and can’t you do?

A

Audio is connected to onside VHF comm and VHF nav
Transmission outside the aircraft is not possible
Interphone available
Microphone is hot and can’t be deselected
Aux hack allows audio from the cross side ARCDU to be heard

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6
Q

Remote control audio unit (RCAU) failure the emergency mode can be selected which results in?

A

The headset and mic connected to outside VHF
Interphone audio available
Audio level is fixed for VHF and INT
Interphone function is not available

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7
Q

What can you do if you have an ARCDU malfunction?

A

Use Aux headphone socket. This provides audio from the off side ARCDU

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8
Q

VHF antennas location (external)?

A

VHF 1 upper fuselage
VHF2 lower fuselage

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9
Q

How to control VHF 1 if both ARCDUs fail?

A

VHF 1 standby controller powered by L ess bus

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10
Q

VHF 1 “FAIL” message on ARCDU caused by?

A

Failure of VHF com or 28V DC removal of power source

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11
Q

Stick mic disabled after?

A

3mins continuous it will auto disable the mic

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12
Q

CVR records?

A

Last 2 hrs of flight deck audio
Clock info
All PAs

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13
Q

CVR impact switch force?

A

5.5Gs or greater

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14
Q

FLT DATA RECORDER caution light illuminated?

A

Malfunction or the FDR is not energised

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15
Q

ELT uses what power?

A

Own independent battery pack

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16
Q

PA amplifier power source and what does the system do?

A

L ess bus
Increased address putout by 6 decibels when engines are running

17
Q

Can lavatory smoke detection chime be heard in flight comp?

A

No

18
Q

PES passenger entertainment system?

A

Music and safety demo

19
Q

Illumination of the FLT DATA RECORDER cation light indicates?

A

There is a malfunction or the unit is depowered

20
Q

On the pilots ARCDU positioning the NORM/EMER switch to EMER results in?

A

The pilots headset being connected directly to VHF1

21
Q

The nose wheel steering PTT switch can be used?

A

For radio and interphone/ PA communications

22
Q

A failure to the VHF1 controller becoming active?

A

A FAIL message being displayed next to VHF1 on both ARCDUs

23
Q

The cockpit voice recorder consists of?

A

A solid state unit storing the last 120mins

24
Q

Should both ARCDUs fail VHF can be controlled by?

A

The standby controller on the forward centre console

25
Q

The service interphone enables the crew to communicate with ground crew at how many stations?

A

3

26
Q

The flight data recorder stored data from the previous?

A

25hrs

27
Q

Should a PA be made by a pilot while the flight attendant is making a PA..?

A

The pilot will override the flight attendant PA

28
Q

The co pilots ARCDU is normally powered by the?

A

Right essential bus

29
Q

Illumination of the FLT DATA RECORDER caution light indicates ?

A

There is a malfunction or the unit is depowered

30
Q

On the pilot’s ARCDU, positioning the NORM / EMER switch to EMER results in ?

A

The pilot’s headset being connected directly to VHF1

31
Q

The nose wheel steering PTT switch can be used ?

A

For radio and interphone / PA communications

32
Q

A failure to the VHF1 receiver is indicated by ?

A

A FAIL message being displayed next to VHF1 on both ARCDUs

33
Q

The cockpit voice recorder consists of ?

A

A solid state unit storing the last 120 minutes

34
Q

Should both ARCDUs fail VHF can be controlled by ?

A

The standby controller on the forward centre console

35
Q

The service interphone enables the crew to communicate with ground crew at how many stations?

A

Three

36
Q

The flight data recorder stores data from the previous ?

A

25 hours

37
Q

Should a PA be made by a pilot while the flight attendant is making a PA ?

A

The pilot PA will over-ride the flight attendant PA

38
Q

The co-pilot’s ARCDU is normally powered by the ?

A

Right essential bus

Q400 (24 decks)

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