Communications (23)

Question 1

How is data prevented from downloading/uploading of maintenance data when airborne?

Answer 1

WOW switch

Question 2

What comprises the basic communication system?

Answer 2

• Intercom
• 2 VHF transceivers

Question 3

What audio sources are routed over the intercommunication system?

Answer 3

1. Intercom
2. VHF Radios
3. CAS Messages & Tones
4. HTAWS
5. TCAS
6. Nav system

Question 4

What are the major components of the Intercommunication system?

Answer 4

• Audio management Unit (for headsets)
• Cockpit Audio Control panel (ACP)
• Cabin ACP
• Remote Memory Unit
• Pax intercom amplifier
• Pax speaker amplifier
• External Socket

Question 5

What is the range of the VHF radios?

Answer 5

200nm

Question 6

What controls the transceivers?

Answer 6

AMMS
EDCU
ACP
CCD

Question 7

What is the primary and secondary methods of operating the VHF radios?

Answer 7

1. EDCU
2. CCD

Question 8

What powers the AMU (Audio Management Unit)

Answer 8

28Vdc from EMER 1 & ESS1

Question 9

What powers the PSA (Pax Speaker Amplifier)?

Answer 9

MAIN 3

Question 10

Where are the RMU, AMU and PIA fitted?

Answer 10

In the bay below the pilot foot well.

Question 11

What is the AMU?

Answer 11

Audio Management Unit

Question 12

What is the RMU?

Answer 12

Remote Memory Unit

Question 13

What is the AMU?

Answer 13

Audio Management Unit

Question 14

What is the PIA?

Answer 14

Passenger Intercom Amplifier

Question 15

What is the PSA?

Answer 15

Passenger Speaker Amplifier
(Rear Avionics)

Question 16

What happens when you select BK-UP in the CACP?

Answer 16

1. ISO triggered in BOTH ACPs
2. CAS advisory ICS BKUP/EMERG posts
3. BOTH ACPs revert BKUP
4. ALL cabin and headset functions are disabled
5. Power from AMU reverts to BKUP Power Suppy

Question 17

What is the function of the ISO CALL button?

Answer 17

Puts the Front and Back into isolation
Pressing it again on any crew ACP will revert it back to the ICDS normal mode

Question 18

What happens when you select EMER on the ACP?

Answer 18

1. Both ACPs revert to EMER
2. [ICS BKUP/EMER] posted
3. ALL ACP controls disabled
4. PAX headsets are disabled

Question 19

What are the 2 ways of ICS EMER mode activated?

Answer 19

1. Automatically (when AMU detects loss of Comm with 1 ACP)
2. Manually

Question 20

In EMER Mode what is available to each seat position?

Answer 20

SIC - VHF1, NAV1, CAS, TAWS & TCAS Audio
PIC - VHF2, NAV2, CAS, TAWS & TCAS Audio

Question 21

How many BITs have the ACPs got?

Answer 21

1. PBIT (Power-Up BIT)
2. CBIT (Continuous BIT)

Question 22

What happens if the ACP CBIT detects a loss of link for more than 0.5s?

Answer 22

Activates the EMER mode

Question 23

What are the 3 methods of transmitting?

Answer 23

1. ACP
2. Cyclic
3. Foot Switch

Question 24

Where are the VHF antennae fitted?

Answer 24

VHF1 - Upper
VHF2 - Lower

Question 25

What happens to the radio if you suffer an EDCU failure?

Answer 25

The onside radio goes to guard

Question 26

What are the methods of controlling the VHF system?

Answer 26

1. EDCU 2. CCD

Question 27

What condition is Squelch at power-up?

Answer 27

ON

Question 28

How many preset frequencies can be stored in the AMMS?

Answer 28

20

Question 29

What happens when you press EMER in the EDCU CHF sub menu?

Answer 29

Sets VHF guard on VHF1

Question 30

Where can you check for COMM & NAV serviceability

Answer 30

Test page of EDCU

Question 31

How does the aircraft protect against permanent PTT?

Answer 31

After 2 minutes of continuous TX, the system will reset the system.

Question 32

What is the priority of the PTT system?

Answer 32

None First come, first served

Question 33

How are preset channel frequencies loaded?

Answer 33

Via DTD

Question 34

What is the transmitter duty cycle limit?

Answer 34

60s continuous in any 5 min period