AC Communications

Question 1

ARCDU?

Answer 1

Audio and radio control display unit

Question 2

ARCDU 1 and 2 power source?

Answer 2

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

Question 3

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

Answer 3

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

Question 4

INT intercom “FAIL” message on the ARCDU means?

Answer 4

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

Question 5

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

Answer 5

Audio is connected to the onside VHF COMM & VHF NAV only (at a fixed and loud volume)
Transmission outside the aircraft is not possible
Interphone is available (at loud volume), ‘CALL’ and ‘PA’ not available
Handset, boom and mask to INT only,
The AUX phone plug can be utilised to listen to audio from the cross-side ARCDU, and
ADSB still available with ALT 2/ATC 2 fail.

Question 6

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

Answer 6

The headset and microphones are connected directly to the onside VHF (i.e. can receive and transmit on the onside VHF only),
Only the INT audio is available (and PACIS available),
The audio level is fixed for the applicable VHF and INT, and
A red EMER message is displayed on the third line of the INT area.

Question 7

What can you do if you have an ARCDU malfunction?

Answer 7

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

Question 8

VHF antennas location (external)?

Answer 8

VHF 1 upper fuselage
VHF2 lower fuselage

Question 9

How to control VHF 1 if both ARCDUs fail?

Answer 9

VHF 1 standby controller powered by L ess bus

Question 10

VHF 1 “FAIL” message on ARCDU caused by?

Answer 10

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

Question 11

Stick mic disabled after?

Answer 11

3mins continuous it will auto disable the mic

Question 12

CVR records?

Answer 12

Last 2 hrs of flight deck audio
Clock info
All PAs

Question 13

CVR impact switch force?

Answer 13

5.5Gs or greater

Question 14

FLT DATA RECORDER caution light illuminated?

Answer 14

Malfunction or the FDR is not energised

Question 15

ELT uses what power?

Answer 15

Own independent battery pack

Question 16

PA amplifier power source and what does the system do?

Answer 16

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

Question 17

Can lavatory smoke detection chime be heard in flight comp?

Answer 17

No

Question 18

PES passenger entertainment system?

Answer 18

Music and safety demo

Question 19

Illumination of the FLT DATA RECORDER cation light indicates?

Answer 19

There is a malfunction or the unit is depowered

Question 20

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

Answer 20

The pilots headset being connected directly to VHF1

Question 21

The nose wheel steering PTT switch can be used?

Answer 21

For radio and interphone/ PA communications

Question 22

A failure to the VHF1 controller becoming active?

Answer 22

A FAIL message being displayed next to VHF1 on both ARCDUs

Question 23

The cockpit voice recorder consists of?

Answer 23

A solid state unit storing the last 120mins

Question 24

Should both ARCDUs fail VHF can be controlled by?

Answer 24

The standby controller on the forward centre console

Question 25

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

Answer 25

3

Question 26

The flight data recorder stored data from the previous?

Answer 26

25hrs

Question 27

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

Answer 27

The pilot will override the flight attendant PA

Question 28

The co pilots ARCDU is normally powered by the?

Answer 28

Right essential bus

Question 29

Illumination of the FLT DATA RECORDER caution light indicates ?

Answer 29

There is a malfunction or the unit is depowered

Question 30

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

Answer 30

The pilot’s headset being connected directly to VHF1

Question 31

The nose wheel steering PTT switch can be used ?

Answer 31

For radio and interphone / PA communications

Question 32

A failure to the VHF1 receiver is indicated by ?

Answer 32

A FAIL message being displayed next to VHF1 on both ARCDUs

Question 33

The cockpit voice recorder consists of ?

Answer 33

A solid state unit storing the last 120 minutes

Question 34

Should both ARCDUs fail VHF can be controlled by ?

Answer 34

The standby controller on the forward centre console

Question 35

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

Answer 35

Three

Question 36

The flight data recorder stores data from the previous ?

Answer 36

25 hours

Question 37

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

Answer 37

The pilot PA will over-ride the flight attendant PA

Question 38

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

Answer 38

Right essential bus

Question 39

What’s the PACIS ?

Answer 39

Passenger address and communication interphone system