Communications¶
Communications: 1 General¶
The aircraft communication system provides: - Radio communication between aircraft and ground stations - An interphone between: o Cockpit crew stations o Cabin crew stations o Ground crew stations. - Passenger address system - Distribution through loudspeakers of aural alerts generated by FWS and T2CAS. Note As per regulations all communications are recorded on the Cockpit Voice Recorder. The communication system comprises: - As standard features: o Radio Management Application o VHF System o Passenger Address o Ground Crew Call System o Cabin and Flight Crew Call System o Cabin and Service Interphone o Audio Integrating o Static Discharger o Cockpit Voice Recorder. - As optional features: o HF System o SELCAL o Aircraft Communication Addressing of Reporting System (ACARS) o Announcement & Music Reproducing System. In addition the communication system includes two ATC transponders.
Communications: 2 VHF Communication System¶
The aircraft is equipped with two identical VHF systems independent of each other. The VHF transceiver operates in the 118 MHz to 136.975 MHz range with 8.33 kHz spacing. The VHF 1 or VHF 2 transceiver enables to transmit and receive voice communications through acoustic equipment (boomset, headset, hand microphone, loudspeakers and oxygen mask). Each system includes a transceiver connected to his antenna and to the RMA.
The VHF has the capability to automatically cutoff transmission against unintentional or continuous transmission linked with jammed Push-To-Talk (PTT) devices or equipment malfunction. After 30 s of continuous transmission, a tone is heard to indicate impending cutout of transmission (TX). Five seconds later, transmission is cutoff and FAIL indication replaces the active frequency on the VCP/MCDU. The tone and the FAIL indication remains displayed as long as the VHF is latched for transmission. VHF EMITTING alert is displayed on EWD and reception mode (RX) remains available on the affected VHF. VHF EMITTING alert remains displayed on EWD as long as affected VHF transmission (TX) is not restored, Refer to PRO.NNO.ABN.23.1 VHF EMITTING - Alert
Communications: 3 HF Communication System¶
(Applies: 1054) The aircraft is equipped with a single HF system. This system enables two way voice communications in the 2 MHz to 29.9999 MHz range providing a selection capability of 280 000 channels, spaced at 100 Hz increments. Each system includes a transceiver connected to the single HF antenna and to the RMA. Note During HF communications, ADFs are inhibited to avoid interferences. HF system is SELCAL capable.
Communications: 4 Interphone System¶
The service interphone system enables communications between flight crew, cabin crew, and the ground crew. Ground Service interphone jacks enable connection of headsets. The service interphone function in the cockpit is activated by selection of INT in the Captain or First Officer audio control panel. Communication between all stations: the cockpit and the service interphone jacks.
Communications: 5 Passenger Address System¶
The Passenger Address (PA) system enables the flight and cabin crew to make announcements to the passengers. PA system also generates single chime sound in the cabin.
The PA system is connected to: - The RCAU which enables the flight crew to make announcements to the passengers by selecting PA key on audio control panel - The cabin crew handset - The cabin crew CALL pb distributed in the cabin for the passengers - The cabin crew CALL pb in the cockpit - The NO DEVICE/FASTEN SEAT BELTS controls - The CVR - Loudspeakers distributed in the cabin (one of them being installed in the toilet).
Communications: 6 Radio Management Function¶
The Radio Management System (RMS) handles Radio COMMunication, Radio NAVigation, and TCAS/XPDR through Virtual Control Panels (VCPs), Multi Function Control Panel (MCPs), and Multi Control Display Units (MCDUs). These functions, which are performed by the Radio Management Application RMA, ensure the correct management and the information exchange involving input data and equipment. The aim of RMA is to manage sets of radio navigation and radio communication equipment and to provide flight crew communication and navigation settings awareness on different displays. RMS consists of two redundant RMA software applications, RMA 1 and RMA 2, which are hosted respectively inside Display Units 2 and 4.
MCDU1 -- RMA1/VCP1 --+ +-- Audio Control Panel CAPT
MCP1 ----------------+--> DCA1/CAC1 --+-- VHF/HF/NAV audio sources
+-- CAPT RCAU / F/O RCAU
MCDU2 -- RMA2/VCP2 --+ +-- Audio Control Panel F/O
MCP2 ----------------+--> DCA2/CAC2 --+-- VHF/HF/NAV audio sources
RMA1/VCP1 <---------------- X-TALK ----------------> RMA2/VCP2
Marker/ILS and transponder sources feed their associated DCA/CAC side.
- Fig. 1 : RMS Architecture - 8 Distribution of Aural Alerts General The aircraft can generate two types of audio indicators:
- sounds, generated by the CCAS or FWS
- synthetic voice messages, generated by the surveillance systems (TCAS and GPWS / TAWS)
CCAS - FWS Aural Alerts FWS Aural Alerts Aural Alert Meaning C chord Altitude alert (caution) Cavalry charge AP disconnect (warning) Clacker Overspeed (warning) Continuous Repetitive Chime Master Warning and red warning message Cricket Stall (warning) Door bell Calls (caution) Single chime Master Caution and amber caution message Triple click AP cap downgrad or Speed protection (caution) Whooler Trim in motion (warning) For more information, Refer to DSC.31.12.1.7 Aurals.
TCAS Aural Alerts Aural Alert Meaning CLEAR OF CONFLICT Resolution Advisory CLIMB, CLIMB Resolution Advisory CLIMB, CROSSING CLIMB, CLIMB, CROSSING CLIMB Resolution Advisory CLIMB-CLIMB NOW, CLIMB-CLIMB NOW Resolution Advisory unsufficient DESCEND, CROSSING DESCEND, DESCEND, CROSSING DESCEND Resolution Advisory DESCEND, DESCEND Resolution Advisory DESCEND-DESCEND NOW, DESCEND- DESCEND NOW Resolution Advisory unsufficient INCREASE CLIMB, INCREASE CLIMB Resolution Advisory unsufficient INCREASE DESCENT, INCREASE DESCENT Resolution Advisory unsufficient LEVEL OFF, LEVEL OFF Resolution Advisory MAINTAIN VERTICAL SPEED, CROSSING MAINTAIN Resolution Advisory MAINTAIN VERTICAL SPEED, MAINTAIN Resolution Advisory MONITOR VERTICAL SPEED Resolution Advisory TRAFFIC, TRAFFIC Traffic Advisory For more information, Refer to DSC.34.1.3.1 Operation.
GPWS - TAWS Aural Alerts GPWS Aural Alerts
(Applies: 1126) Aural Alert Meaning DON’T SINK GPWS Mode 3 alert For more information, Refer to 1 GLIDE SLOPE GPWS Mode 5 alert For more information, Refer to 1 MINIMUM GPWS Mode 6 alert For more information, Refer to 1 SINK RATE - WHOOP WHOOP PULL UP GPWS Mode 1 alert For more information, Refer to 1 TERRAIN TERRAIN - WHOOP WHOOP PULL UP GPWS Mode 2 alert For more information, Refer to 1 TOO LOW FLAPS GPWS Mode 4 alert For more information, Refer to 1 TOO LOW GEAR GPWS Mode 4 alert For more information, Refer to 1 TOO LOW TERRAIN GPWS Mode 4 alert For more information, Refer to 1
TAWS Aural Alerts
(Applies: 1054-1096;1237-1283) Aural Alert Meaning APPROACHING DECISION HEIGHT GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 AVOID OBSTACLE Avoid obstacle warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness AVOID TERRAIN Avoid terrain warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness BANK ANGLE GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 DECISION HEIGHT GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 DON’T SINK GPWS Mode 3 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.3 Mode 3 FIFTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 FIVE HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 FORTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 GLIDE SLOPE GPWS Mode 5 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.5 Mode 5
Aural Alert Meaning OBSTACLE AHEAD Obstacle caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness OBSTACLE AHEAD - PULL UP Pull up warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness ONE HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 SINK RATE GPWS Mode 1 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.1 Mode 1 SINK RATE - PULL UP GPWS Mode 1 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.1 Mode 1 TEN GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 TERRAIN AHEAD Terrain caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TERRAIN AHEAD - PULL UP Pull up warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TERRAIN TERRAIN GPWS Mode 2 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.2 Mode 2 TERRAIN TERRAIN - PULL UP GPWS Mode 2 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.2 Mode 2 TOO LOW FLAPS GPWS Mode 4 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4
Aural Alert Meaning TOO LOW GEAR GPWS Mode 4 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4 TOO LOW TERRAIN GPWS Mode 4 alert (reactive mode) or Terrain caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4 or Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TWENTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 TWO HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6
TAWS Aural Alerts
(Applies: 1124;1142-1160) Aural Alert Meaning APPROACHING DECISION HEIGHT GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 APPROACHING MINIMUM GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 AVOID OBSTACLE Avoid obstacle warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness AVOID TERRAIN Avoid terrain warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness BANK ANGLE GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 DECISION HEIGHT GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 DON’T SINK GPWS Mode 3 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.3 Mode 3 FIFTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 FIVE HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 FORTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 GLIDE SLOPE GPWS Mode 5 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.5 Mode 5
Aural Alert Meaning MINIMUM MINIMUM GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 OBSTACLE AHEAD Obstacle caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness OBSTACLE AHEAD - PULL UP Pull up warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness ONE HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 SINK RATE GPWS Mode 1 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.1 Mode 1 SINK RATE - PULL UP GPWS Mode 1 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.1 Mode 1 TEN GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 TERRAIN AHEAD Terrain caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TERRAIN AHEAD - PULL UP Pull up warning (predictive mode) For more information, Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TERRAIN TERRAIN GPWS Mode 2 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.2 Mode 2 TERRAIN TERRAIN - PULL UP GPWS Mode 2 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.2 Mode 2
Aural Alert Meaning TOO LOW FLAPS GPWS Mode 4 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4 TOO LOW GEAR GPWS Mode 4 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4 TOO LOW TERRAIN GPWS Mode 4 alert (reactive mode) or Terrain caution alert (predictive mode) For more information, Refer to DSC.34.12.1.2.1.4 Mode 4 or Refer to DSC.34.12.1.2.2.1 Terrain and Obstacle Awareness TWENTY GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 TWO HUNDRED GPWS Mode 6 alert (reactive mode) For more information, Refer to DSC.34.12.1.2.1.6 Mode 6 11 ACARS General
(Applies: 1096-1283) The ARINC Communication Addressing and Reporting System (ACARS) system is optional. It can be customized by the operator to meet their requirements. This chapter provides a generic description of system. Refer to Collins Operator’s Guide for detailed description of all features. The ACARS is a data link system which enables exchange of data between an aircraft and a ground based station over an ARINC or SITA network.
System Description
(Applies: 1096-1283) The airborne ACARS system includes: - One CMU (Communication Management Unit) installed in one 80VU avionics shelf - Two MCDUs (Multifunction Control Display Unit) installed on the pedestal. The MCDU are the main interface for preparing, sending downlink messages and reading uplink messages. MCDUs are shared between FMS 1/2, RMS 1/2, MPC and ACARS - One printer for printing out, if necessary, messages received and displayed on MCDU - One VHF (VHF 3). This VHF is dedicated to ACARS and cannot be used for voice communications - Two ATC DLK attention getter lights which turn on upon reception of ATS messages - Aircraft discretes for OOOI (Out of Gate, Takeoff, Aircraft On Ground, Aircraft In Gate) information. The system is interfaced with: - MPC for engine parameters and Fuel On Board - GPS for position and time - ATC control panel for Flight Identification.
MCDU 2 CMU ACARS RMS 1/2 MPC FMS 1/2 MCDU 1 VHF3 PRINTER ATC DLK ATC DLK GPS ATC WOW, PARKING BRAKE, DOOR MPC FUEL QUANTITY INDICATOR
System Functions
(Applies: 1096-1283) The ACARS system main pages are the following: - AOC STD (Airline Operation Control Standard) pages: These pages are identified by DL in page header. They give access to predefined report pages and free text page - ATS (Air Traffic Services) pages: These pages are identified by ATS in page header. ATS Departure Clearances and D-ATIS are available in ATS MENU page - TECHNICAL pages: These pages are used for system initialization and identified by ACARS in header. All functions are detailed in Collins Operator’s Guide.
Communications: 1 Audio Control Panel¶
4 2 2 VU/SAT HF PA INT VHF2 VHF1 RAD INT 1 VOR 2 ONLY ILS 1 DME 2 1 ADF 2 MKR VOICE ONLY 1 3 1 Volume Control Knob To control reception volume for associated communication or navigation facility. 2 Transmission Keys To select the individual communication facility for transmission, 6 interlocked keys are provided. Only one key can be engaged at a time. Light comes on white when selected. 3 VOICE ONLY Key When pressed, it inhibits NAV receivers station identification by activating a band cut off filter above 1 020 Hz. Voice only light comes on amber.
4 INT/RAD Selector Provides selection of transmission mode when using OXY MASK or BOOMSET microphone (MIC). INT Hot MIC position. Interphone is always operative between crew stations. Other transmissions require selecting a transmission key and using a PTT pb. NEUTRAL Interphone is inoperative. Other transmissions require selecting a transmission key and using a PTT pb. RAD This position is required to automatically connect for transmissions BOOMSET and OXY MASK MICs without using a PTT pb, when released the selector is spring-loaded to NEUTRAL. Note Recovering boomset/micro function when the oxygen mask is out of its container : Refer to PRO.NOP.NSU.25.1.1 Boomset-Micro Function Recovery on Oxygen Mask.
Communications: 2 MCP¶
The Multi Function Control panel (MCP) enables the modification of some communications parameters via a keyboard.
1 2 3 4 5 6 7 8 9 0 COM NAV SURV ESC ENT Refer to DSC.31.4.2.9 MCP for more details about MCP.
Communications: 3 VCP¶
The Virtual Control panel (VCP) is a part of MFD. It appears on the bottom right of MFD. VCP communication page appears by pressing COM on the MCP. VHF or HF pages can be selected by using arrow pushbuttons on MCP to select the communication equipment required. Selection on one VCP is simultaneously updated on the opposite flight crew member display.
PWR B + - C + - MFD UPPER WINDOW MEMO PANEL DISPLAY VIRTUAL CONTROL PANEL WINDOW
Communications: 4 VHF Control Box¶
1) VHF VCP Page VCP VHF page enables the management of VHF 1 and 2 frequencies.
ACTIVE
< VHF HF 1 HF 2 STBY 123.125 122.350 ACTIVE VHF2
< STBY 118.100 125.175 1 2 MFD 3 VHF1
1 ACTIVE Active frequency window, enables the flight crew to set a new active frequency by clicking on it (MCP or MCDU). FAIL amber message is displayed in the frequency window when the associated VHF is failed or is continuously transmitting for more than 35 s. 2 Transfer Switch Clicking on it transfers stand by frequency to active (MCP or MCDU). 3 STBY Standby frequency windows, enables the flight crew to set a new standby frequency by clicking on it (MCP or MCDU).
2) COMMUNICATION MCDU Page
COMMUNICATION AUTO 1234 8.210 118.005 22.000 XPDR IDENT NAV HF1 VHF1 TX 1 TCAS NORM DSPL ON ALT ON MODE V V V V V V V V V V V V 1 XPDR 1 HF2 VHF2 148.210 1 2 1 VHF 1 Active frequency can be set directly from scratchpad by activating the appropriate LSK. 2 VHF 2 Active frequency can be set directly from scratchpad by activating the appropriate LSK. 3) VHF MCDU page More parameters are available on MCDU VHF page:
V V V V V V V VHF 1 V V V V V A C T I V E 118.005 S T B Y 125.250 PRESET RETURN OFF S Q L ON/ EMER 2 5 1 4 3 1 ACTIVE Active frequency can be set directly from scratchpad, standby, preset, or emergency frequency by activating the appropriate LSK. FAIL amber message replaces the active frequency and - - replaces TX symbol when the associated VHF is failed or continously transmitting for more than 35 s. 2 STBY Stand by frequency, set from scratch pad or preset. 3 PRESET R3 LSK enables access to preset frequencies. 4 SQL R5 LSK enables turning off/on the squelch. Note Turn on the squelch to avoid receiving audio noise from a VHF transceiver. However when the squelch is turned on, it may suppress useful VHF voice message when the signal is weak. CAUTION With the squelch turned on, a VHF transceiver may attenuate and block the received signal when the other VHF transceiver is transmitting. In case VHF transceivers are simultaneously used, it is therefore recommended to turn the squelch off to prevent loss of reception.
5 EMER R6 LSK if pressed will automatically tune emergency frequency 121.500 as active. 4) IESI
MENU STD SEL SET + - 130 VHF1 10 10 1013 VOR1 125 180 240 118.100 201 2 20 127 00 220 013 113.10 1 2 3 1 VHF 1 VHF 1 frequency display, FAIL when VHF 1 is failed. 2 SEL pb Multifunction pushbutton enables selection of VHF submenu. After tuning, the frequency needs to be confirmed by pressing SEL pb again. 3 SET Multifunction rotary knob enables tuning of VHF frequency. For further information Refer to INDICATION ON IESI or Refer to THALES user’s guide for the IESI .
Communications: 5 ATC Control Box¶
ATC Controls are on XPDR tab of VCP (Virtual Control Panel) which is part of MFD.
MFD ON 2623 IDENT STBY ALT OFF FLT ID ABF50505 XPDR XPDR 1 XPDR 2 TCAS 1 2 3 4 2 1 XPDR 1 or 2 Select active transponder via MCP or MCDU. 2 XPDR Mode selection ON Transponder is active. STBY Power is applied to the system but prevents it from transmitting. ALT OFF Altitude reporting is deactivated. 3 Code Display Transponder code entered via MCP or MCDU. 4 IDENT Button When activated through MCP or MCDU, enables transmission of IDENT. Note - Button visual description: o Circle: Filled color: Black (inactive mode),Cyan (selected mode), amber (failure) o Square: ticked cyan (active), not ticked (stand by). - XPDR is configured through MCDU by selecting RMS menu then XPDR page. Code, Mode, Altitude Reporting, FLT ID or Selected XPDR functions can be changed on the XPDR page.
1) COMMUNICATION MCDU page (all information are reported on the VCP)
COMMUNICATION AUTO 1234 8.210 118.005 22.000 XPDR IDENT NAV HF1 VHF1 TX 1 TCAS NORM DSPL ON ALT ON MODE V V V V V V V V V V V V 1 XPDR 1 HF2 VHF2 130.000 1 1 Transponder Code Transponder code can be set from scratchpad by activating the appropriate LSK.
2) XPDR MCDU page (all information are reported on the VCP)
XPDR ON/ 1234 1/ IDENT EMER MODE CODE STBY V V V V V V V V V V V V 2 XPDR SEL FLT ID ABF50505 ALT 1500FT ON/ OFF RETURN 1 3 2 4 5 7 6 1 Transponder CODE Transponder CODE can be set from scratchpad by activating the appropriate LSK. 2 XPDR MODE selection with LSK ON Transponder is active. STBY Power is applied to the system but prevents it from transmitting. 3 ALT selection with LSK ALT OFF Altitude reporting is deactivated. 4 FLT ID Flight number can be set from scratchpad by activating the appropriate LSK. 5 XPDR SEL with LSK Transponder Selection. 6 IDENT with LSK Identification number 7 EMER Displays automatically transponder emergency code 7700 in amber, to be activated has to be confirmed by pressing on the EXECute key on MCDU.
Communications: 6 PUSH-TO-TALK Selector on Control Wheel¶
RADIO NEUTRAL INTERPHONE The outboard horn of both control wheels is provided with Push-To-Talk (PTT selector) controlling the transmission mode and effective only when BOOMSET or OXY MASK MIC is used for transmission. PTT Selector INTERPHONE Forward position spring-loaded to neutral. Transmission on flight interphone selected. INT transmission key has not to be used to communicate between cockpit crew stations. NEUTRAL Center position. Transmission is not possible. Reception is normal. Hand microphones are connected for transmission when keyed. RADIO Backward position spring-loaded to neutral. BOOMSET or OXY MASK is connected for transmission over the selected communication equipment.
Communications: 7 RAD PTT Pb on Nose Wheel Steering Control Handwheel¶
When pressed BOOMSET or OXY MIC is connected for transmission over the selected communication equipment.
Communications: 8 Headset-Boomset-Hand Microphone Panels¶
HEADSET O O M B HAND MIC Enable connection of a boomset, a headset, and a hand MIC.
Communications: 9 Loudspeakers Volume Knobs¶
MIN MAX 2VU LOUD SPEAKER CAPT MIN MAX 6VU LOUD SPEAKER F/O
Communication reception over cockpit loudspeakers is controlled by an individual knob for each of the two cockpits loudspeakers. Note In case of aural alert: - Normal volume is always available regardless of knobs position - During any transmission, the volume of both loudspeakers is muted.
Communications: 10 Audio Sel Pushbutton¶
FAULT ALTN AUDIO 1 SEL N O R M FAULT ALTN AUDIO 2 SEL N O R M Controls functioning of associated RCAU processing board. AUDIO SEL Pushbutton NORM (Pb pressed) RCAU functions normally. FAULT Comes on amber and the FWS is activated when an associated RCAU processing board failure or power loss is detected. ALTN (Pb released) The corresponding flight crew station is connected directly to a predefined VHF: - AUDIO 1 SEL pb connects CAPT station to VHF 1, or - AUDIO 2 SEL pb connects F/O station to VHF 2. Volume is adjusted by affected loudspeaker volume control. Note On the affected side, PA, interphone, and other VHF can no longer be used.
Communications: 11 Emergency Beacon¶
EMER LOC XMTR 28VU MAN AUTO FOR AVIATION EMERGENCY USE ONLY UNLICENSED OPERATION UNLAWFUL ALERT X MIT AUTO TEST R S T The transmitter is in the ceiling of the cabin between the passengers entry door and the toilet door. The antenna is in the fairing ahead of the stabilizer fin. This system includes its own battery. Emergency Beacon AUTO Transmission is made automatically on 121.5 MHz, 243 MHz, and 406 MHz when deceleration exceeds 5 g (X MIT ALERT Iight comes on amber). MAN Enables commanded operation ( X MIT ALERT amber Iight comes on). AUTO TEST RST It is used in case of undue alert (reset), or to test the Emergency beacon. Two cases are possible for the test: - No failure is detected : X MIT ALERT amber Iight comes on during 2 s - Failure is detected: X MIT ALERT light flashes during 15 s. CAUTION The test must not be performed in MAN mode. Aircraft on ground (and electrically supplied), when the emergency beacon is triggered after 30 s, the mechanical horn is triggered too. The ELT is located in the ceiling area of the passenger cabin, above the rear cabin crew seat. ELT
Communications: 12 Calls Pushbutton¶
CALL RESET MECH ATTND CALL CALLS
EMER ATTND pb Call CALL blue light comes on and chimes will be generated when receiving a normal call from the cabin attendant. Amber EMER will come on and chimes will be generated, when an emergency call has been made from the cabin attendant handset. When pressed the pushbutton will generate a cockpit call at the cabin attendant station. MECH pb Call When a Mechanic call is received, the CALL blue light comes on while the chimes sound. When the pushbutton is pressed, a horn in the nose wheel bay sounds to draw attention of the ground crew. RESET pb Chimes will cease and the system will be rearmed for next call by pressing the RESET pb.
Communications: 13 HF Control Box¶
1) HF VCP page
MFD ACTIVE HF1
< VHF HF 1 HF 2 STBY 12.345 11.345 SQUELCH USB PWR MED OFF 1 2 3 1 2 3 4 5 6 1 ACTIVE Active frequency box, enables setting a new active frequency by clicking on it. 2 Transfer Switch Clicking on it transfers standby frequency to active. 3 STBY Standby frequency box, enables setting a new standby frequency. 4 USB / AM Display of selected modulation (USB or AM), setting can only be done through MCDU. 5 Power Output Intensity Display of selected power output intensity (LO, MED, HI), setting can only be done through MCDU. 6 SQUELCH Squelch attenuation intensity, enables setting squelch attenuation by clicking on selected circle.
2) Communication MCDU Page (all information are reported on the VCP)
COMMUNICATION AUTO 1234 8.210 118.005 22.000 XPDR IDENT NAV HF1 VHF1 TX 1 TCAS NORM DSPL ON ALT ON MODE V V V V V V V V V V V V 1 XPDR 1 HF2 VHF2 148.210 1 1 1 Active Frequency Active frequency can be set directly from scratchpad by activating the appropriate LSK.
3) HF MCDU Page
V V V V V V V HF 1 V V V V V M O D E ON A C T I V E 8.210 / S T B Y M O D U L A T I O N USB / A M S T B Y 25.250 PRESET RETURN 3 S Q L O F F / 1 / 2 / P O W E R HI L O / M E D / T X 1 2 3 4 5 6 7 8 1 ACTIVE Frequency Active frequency (cyan), set from scratchpad or from standby frequency. 2 TX TX (Green) transmission in progress. 3 STBY Standby frequency (cyan), set from scratchpad, if R1 LSK pressed, it becomes active. 4 PRESET Access to PRESET frequencies. 5 SQL By pressing R5 LSK sets required squelch attenuation intensity 6 POWER By pressing R6 LSK sets the HF output power 7 USB / AM Enables changing modulation type (USB or AM). 8 MODE Mode selection, in standby the HF is muted.
Communications: 14 VHF&HF Control Sum Up¶
VCP MCDU VHF HF VHF HF page VHF Communi cation HF page Communi cation Active Frequency T T T T T T TX I I I I I I Standby Frequency T T T N T N Preset Frequency N N Ta N Ta N Squelch N T T N T N EMER Mode N T N Mode I T N Modulation Type I T N Power Level I T N a Stored preset can be selected on the Preset Page and used in appropriate tuning page as tuning parameters (Active and Standby Frequency). T: Tunable parameter. I: Information only. N: No information.
Communications: 15 MCDU Sum Up¶
COMMUNICATION AUTO 1234 8.210 118.005 22.000 XPDR IDENT NAV HF1 VHF1 TX 1 TCAS NORM DSPL ON ALT ON MODE V V V V V V V V V V V V 1 XPDR 1 HF2 VHF2 148.210 XPDR ON/ 1234 1/ IDENT EMER MODE CODE STBY V V V V V V V V V V V V 2 XPDR SEL FLT ID ABF50505 ALT 1500FT ON/ OFF RETURN MODE AUTO RETURN V V V V V V V V V V V V NORM/ BLW DSPL / TA_ONLY / STBY ABV / TCAS V V V V V V V VHF 1 V V V V V A C T I V E 118.005 S T B Y 125.250 PRESET RETURN OFF S Q L ON/ EMER V V V V V V V HF 1 V V V V V M O D E ON A C T I V E 8.210 / S T B Y M O D U L A T I O N USB / A M S T B Y 25.250 PRESET RETURN 3 S Q L O F F / 1 / 2 / P O W E R HI L O / M E D / T X V V V V V V V VHF 2 V V V V V A C T I V E 148.210 S T B Y 130.250 PRESET RETURN OFF S Q L ON/ EMER V V V V V V V HF 2 V V V V V M O D E ON A C T I V E 22.000 / S T B Y M O D U L A T I O N USB / A M S T B Y 25.250 PRESET RETURN 3 S Q L O F F / 1 / 2 / P O W E R HI L O / M E D / T X
Communications: 16 ACARS System Functions on MCDU¶
_0c9d7a6e-3990-4f15-a864-b420f0193d58 REV 29 JAN 2026 1096-1283 The MCDU MENU page provides access to the datalink function. To access the MCDU MENU page: - Either press the MCDU MENU key on the CDU (if available), or - Press the IDX function key (or similar) to display the FMS INDEX pages, and select the MCDU MENU function.
<FMS MCDU MENU <DL Pressing the DL key on the MCDU MENU displays the DATALINK page 1/2. To display the DL APPLICATION MENU page, press the <RETURN prompt on either DATALINK page 1/2 or DATALINK page 2/2 .
AOC STD> ATS> TECHNICAL> APPLICATION MENU DL 05:04 From the DL APPLICATION MENU, the flight crew can access the three ACARS system functions (AOC STD, ATS, and TECHNICAL): - AOC STD displays the DATALINK page 1/2. - ATS displays the ATS MENU page. - TECHNICAL displays the TECHNICAL MENU page.
Communications: 17 ATC DLK CAUTION¶
(Applies: 1096-1283)
0000-T-FB429-001 -A-01-N 23 43
133VM x x MASTER WARN MASTER CAUT PULL UP GPWS ATC DLK For the ATS (Air Traffic Service) application messages ATIS (Air Traffic Information Service) and departure clearances received from the ground is indicated by two ATC DLK CAUTION lights. The message can be read on the MCDU. Note These lights are temporarily inhibited during critical flight phases, for example take off.
Communications: 01 Electrical Supply¶
EQUIPMENT DC BUS SUPPLY (C/B) AC BUS SUPPLY (C/B) VHF 1 DC EMER BUS (on overhead panel C/B VHF 1) NIL VHF 2 DC BUS 2 (on overhead panel C/B VHF 2) NIL CAPT audio system DC ESS BUS (on overhead panel C/B CAPT) NIL F/O audio system DC ESS BUS (on overhead panel C/B F/O) NIL XPDR 1 DC EMER BUS (on overhead panel C/B XPDR 1) NIL XPDR 2 DC BUS 2 (on overhead panel C/B XPDR 2) NIL CAPT MCP DC EMER BUS (on overhead panel C/B CAPT MCP) NIL F/O MCP DC ESS BUS (on overhead panel C/B F/O MCP) NIL Attendant call DC ESS BUS (on overhead panel C/B ATTND) NIL Ground crew call DC ESS BUS (on overhead panel C/B PUBLIC ADRESS) NIL HF 2 (if installed) DC ESS BUS (on overhead panel C/B HF 2) NIL HF 1 (if a second HF is installed) DC BUS 1 (on overhead panel C/B HF 1) NIL SELCAL (if installed) DC BUS 1 (on overhead panel C/B SEL CAL) NIL
EQUIPMENT DC BUS SUPPLY (C/B) AC BUS SUPPLY (C/B) VHF 3 (if installed) DC BUS 2 (on overhead panel C/B VHF 3) NIL CMU (if installed) DC BUS 2 (on overhead panel C/B VHF ) NIL
Communications: 1 AUDIO SEL 1(2) FAULT - Alert¶
CONDITION VISUAL AURAL RCAU Processing board failure - OR - Power loss - MC light flashing amber - AUDIO SEL CAPT(F/O) amber message on EWD - AUDIO SEL FAULT amber light on associated side panel SC
Communications: 2 VHF 1+2 LOSS-Alert¶
CONDITION VISUAL AURAL VHF 1+2 failure - MC light flashing amber - VHF 1+2 amber message on EWD SC
Communications: 3 RMS 1+2 FAULT-Alert¶
CONDITION VISUAL AURAL Both RMS failure - MC light flashing amber - RMS 1+2 amber message on EWD SC
Communications: 4 XPDR FAULT - Alert¶
XPDR fault - alert CONDITION VISUAL AURAL Active XPDR system is lost - XPDR amber message on EWD - MC light flashing amber SC
Communications: 5 ADS-B FAULT - Alert¶
ADS-B OUT FAULT - Alert CONDITION VISUAL AURAL ADS-B function is lost - MC light flashing amber - ADS-B amber message on EWD SC
Communications: 01 RCAU Architecture¶
FUNCTIONAL ABSTRACTION - RCAU architecture
[MFC] --------->+
[RADIO COM/NAV] +--> [RCAU] --> CVR
[INTERPHONE] -->+ |
[AURAL ALERTS] -> +--> audio control panels
+--> loudspeakers / audio-level controls
+--> CAPT headset, boomset, hand mic, oxygen-mask mic
+--> F/O headset, boomset, hand mic, oxygen-mask mic
+--> OBS audio panel / hand mic (if installed)
+--> nose-wheel-steering PTT / other PTT switches
+--> address system