Communications (23) Flashcards
How is data prevented from downloading/uploading of maintenance data when airborne?
WOW switch
What comprises the basic communication system?
- Intercom
- 2 VHF transceivers
What audio sources are routed over the intercommunication system?
- Intercom
- VHF Radios
- CAS Messages & Tones
- HTAWS
- TCAS
- Nav system
What are the major components of the Intercommunication system?
- Audio management Unit (for headsets)
- Cockpit Audio Control panel (ACP)
- Cabin ACP
- Remote Memory Unit
- Pax intercom amplifier
- Pax speaker amplifier
- External Socket
What is the range of the VHF radios?
200nm
What controls the transceivers?
AMMS
EDCU
ACP
CCD
What is the primary and secondary methods of operating the VHF radios?
- EDCU
- CCD
What powers the AMU (Audio Management Unit)
28Vdc from EMER 1 & ESS1
What powers the PSA (Pax Speaker Amplifier)?
MAIN 3
Where are the RMU, AMU and PIA fitted?
In the bay below the pilot foot well.
What is the AMU?
Audio Management Unit
What is the RMU?
Remote Memory Unit
What is the AMU?
Audio Management Unit
What is the PIA?
Passenger Intercom Amplifier
What is the PSA?
Passenger Speaker Amplifier
(Rear Avionics)
What happens when you select BK-UP in the CACP?
- ISO triggered in BOTH ACPs
- CAS advisory ICS BKUP/EMERG posts
- BOTH ACPs revert BKUP
- ALL cabin and headset functions are disabled
- Power from AMU reverts to BKUP Power Suppy
What is the function of the ISO CALL button?
Puts the Front and Back into isolation
Pressing it again on any crew ACP will revert it back to the ICDS normal mode
What happens when you select EMER on the ACP?
- Both ACPs revert to EMER
- [ICS BKUP/EMER] posted
- ALL ACP controls disabled
- PAX headsets are disabled
What are the 2 ways of ICS EMER mode activated?
- Automatically (when AMU detects loss of Comm with 1 ACP)
- Manually
In EMER Mode what is available to each seat position?
SIC - VHF1, NAV1, CAS, TAWS & TCAS Audio
PIC - VHF2, NAV2, CAS, TAWS & TCAS Audio
How many BITs have the ACPs got?
- PBIT (Power-Up BIT)
- CBIT (Continuous BIT)
What happens if the ACP CBIT detects a loss of link for more than 0.5s?
Activates the EMER mode
What are the 3 methods of transmitting?
- ACP
- Cyclic
- Foot Switch
Where are the VHF antennae fitted?
VHF1 - Upper
VHF2 - Lower
What happens to the radio if you suffer an EDCU failure?
The onside radio goes to guard
What are the methods of controlling the VHF system?
- EDCU
- CCD
What condition is Squelch at power-up?
ON
How many preset frequencies can be stored in the AMMS?
20
What happens when you press EMER in the EDCU CHF sub menu?
Sets VHF guard on VHF1
Where can you check for COMM & NAV serviceability
Test page of EDCU
How does the aircraft protect against permanent PTT?
After 2 minutes of continuous TX, the system will reset the system.
What is the priority of the PTT system?
None
First come, first served
How are preset channel frequencies loaded?
Via DTD
What is the transmitter duty cycle limit?
60s continuous in any 5 min period
