communication explain

Basic Avionics Course

Communication Systems

Basic Avionics Course

Communication Systems

System IntroductionSystem Introduction

The communication system enables thecrew to exchange voice communicationsand/or data with stations through VHF, HFradios, SATCOM,

The communication system enables thecrew to exchange voice communicationsand/or data with stations through VHF, HFradios, SATCOM,

Communication SystemsCommunication Systems

Interphone system. HF System. VHF system. SELCAL System. Passenger Address System. Cockpit Voice Recorder. SATCOM. Passenger Entertainment System. ACARS.

Interphone system. HF System. VHF system. SELCAL System. Passenger Address System. Cockpit Voice Recorder. SATCOM. Passenger Entertainment System. ACARS.

Interphone SystemInterphone System


Function. Subsystems. System components.

Function. Subsystems. System components.


Function: It provides two way communication between the

flight crew, cabin crew and ground mechanics.

It is also used by the maintenance personnel toaccess the communication system and monitor thecommunication and the navigation receivers.


flight crew, cabin crew and ground mechanics.

It is also used by the maintenance personnel toaccess the communication system and monitor thecommunication and the navigation receivers.

Interphone SubsystemsInterphone Subsystems

1- Flight interphone.

2- Cabin interphone.

3- Service interphone.

1- Flight interphone.

2- Cabin interphone.

3- Service interphone.

Flight Interphone SystemFlight Interphone System

Function: It provides direct communication between the

crew members (Captain, F/O and attendants) .

Two way communication between the flight crewand other 2 jacks:

- At the external power panel.- In the avionics compartment.

Function: It provides direct communication between the

crew members (Captain, F/O and attendants) .

Two way communication between the flight crewand other 2 jacks:

- At the external power panel.- In the avionics compartment.

Main ComponentsMain Components

Flight Crew Interfaces. Audio Management Unit (AMU). Audio control Panel (ACP).

Flight Crew Interfaces. Audio Management Unit (AMU). Audio control Panel (ACP).

Flight Crew InterfacesFlight Crew Interfaces

Flight crew interfaces are used by the flight crewfor audio interface with the AMU.

Interfaces:

1- Headset: It is used for both talking and listening. To talk you

must press PTT (Press TO Talk) on either the controlcolumn or the ACP to make the Mic on.

Flight crew interfaces are used by the flight crewfor audio interface with the AMU.

Interfaces:

1- Headset: It is used for both talking and listening. To talk you

must press PTT (Press TO Talk) on either the controlcolumn or the ACP to make the Mic on.

Flight Crew Interfaces (contd)Flight Crew Interfaces (contd)

2- Hand Mic: It is used for speaking only. It has a PTT switch.

3- Oxygen Mask: It is used in emergency cases like decompression or

smoke detection case. When using it, PTT on ACP orthe control column must be pressed.

4- Headphone: It is used to listen to the audio signal from the

AMU. If the captain needs to talk, he can use theHand Mic.

2- Hand Mic: It is used for speaking only. It has a PTT switch.

3- Oxygen Mask: It is used in emergency cases like decompression or

smoke detection case. When using it, PTT on ACP orthe control column must be pressed.

4- Headphone: It is used to listen to the audio signal from the

AMU. If the captain needs to talk, he can use theHand Mic.

LOUDSPEAKERSLOUDSPEAKERS

OXYGENMASK

OXYGENMASK BOOMSETBOOMSET

CAPTAIN (F/O) SIDE STICK

CAPTAIN (F/O) SIDE STICK

RADIO PTTSWITCH

RADIO PTTSWITCH

HANDMICROPHONE

HANDMICROPHONE

COCKPIT HANDSETCOCKPIT HANDSET

Acoustic Equipment & PeripheralsAcoustic Equipment & Peripherals

Flight Crew Interfaces (contd)Flight Crew Interfaces (contd)

PTT positions:- Neutral: means no talking ( no Tx, only Rx)- Rad (Mic): it permits HF or VHF using.- INT: audio signal goes from mic to interphone

system.

PTT positions:- Neutral: means no talking ( no Tx, only Rx)- Rad (Mic): it permits HF or VHF using.- INT: audio signal goes from mic to interphone

system.

Can you hearme, Peter ?

Can you hearme, Peter ?

Sure,Bob !Sure,Bob !

When in the INT position, the switch operates as a hot mike oneither the boomsets or the oxygen masks. This position enablescommunication between cockpit crew members, or betweencockpit and a ground mechanic without PTT key action.

When in the INT position, the switch operates as a hot mike oneither the boomsets or the oxygen masks. This position enablescommunication between cockpit crew members, or betweencockpit and a ground mechanic without PTT key action.

Audio Management Unit (AMU)Audio Management Unit (AMU) It is an interface between the audio signal and

other systems.

AMU functions:1- Volume control.2- Tx and Rx by sending the PTT to the transceivers.3- SELCAL decoding.4- Controls the audio signal routing in the flight

interphone system.

It is an interface between the audio signal andother systems.

AMU functions:1- Volume control.2- Tx and Rx by sending the PTT to the transceivers.3- SELCAL decoding.4- Controls the audio signal routing in the flight

interphone system.

AMU InterfacesAMU Interfaces

AMUAMU

ACPACP

Boom Mic/Headphone panel

Boom Mic/Headphone panel

Hand MicHand Mic

Oxygen MaskOxygen Mask

SpeakersSpeakers

Interphone systemInterphone system

Navigation systemsNavigation systems

Communication receiversCommunication receivers

PA systemPA system

SELCAL systemSELCAL system

SATCOMSATCOM

CVR systemCVR system

Audio Control Panel (ACP)Audio Control Panel (ACP)

Function:- Allows the use of radio communication and

navigation receivers.- Display the incoming calls from mechanics and

attendants.- Allows the using interphone system.

Function:- Allows the use of radio communication and

navigation receivers.- Display the incoming calls from mechanics and

attendants.- Allows the using interphone system.


ACP construction:- 8 transmission keys.- 8 reception knobs.- Navigation knobs.- INT/ RAD selector- ON VOICE switch.- RESET switch.

ACP construction:- 8 transmission keys.- 8 reception knobs.- Navigation knobs.- INT/ RAD selector- ON VOICE switch.- RESET switch.

ACP 2ACP 2

ACP 1ACP 1

ACP 3ACP 3Audio Control Panel (ACP)Audio Control Panel (ACP)

EXTERNAL POWERCONTROL PANELEXTERNAL POWERCONTROL PANEL

Flight Interphone For Ground MechanicFlight Interphone For Ground Mechanic

Cabin Interphone SystemCabin Interphone System Function: It provides two way communication between the

attendants crew and with the flight crew using theCAB Tx pb on ACP.

At the attendant station, the attendant handset isused to select the required zone (FWD ATT, AFT L,AFT R AND ALL ATT).


attendants crew and with the flight crew using theCAB Tx pb on ACP.

At the attendant station, the attendant handset isused to select the required zone (FWD ATT, AFT L,AFT R AND ALL ATT).

Service InterphoneService Interphone

Function: It permits the communication between the flight

crew and cabin crew and maintenance personnel.

It has several jacks around the A/C fuselage at:- FWD electronic compartment. - Electric compartment. - Avionics compartment.- L, R engines- Hydraulic compartment.- Aft section.- APU Bay.

Function: It permits the communication between the flight

crew and cabin crew and maintenance personnel.

It has several jacks around the A/C fuselage at:- FWD electronic compartment. - Electric compartment. - Avionics compartment.- L, R engines- Hydraulic compartment.- Aft section.- APU Bay.

Service Interphone (contd)Service Interphone (contd)

Construction:1- An amplifier.2- No. of handset jacks located through out the A/C.3- Handset at the attendant station.4- Microphones and loudspeakers in the cockpit.

Construction:1- An amplifier.2- No. of handset jacks located through out the A/C.3- Handset at the attendant station.4- Microphones and loudspeakers in the cockpit.


The service interphone operates automatically onground after the L/G is down by 10 seconds.

If the A/C is on jacks, it is considered as in flight sothere is an override switch to operate the serviceinterphone.

The service interphone operates automatically onground after the L/G is down by 10 seconds.

If the A/C is on jacks, it is considered as in flight sothere is an override switch to operate the serviceinterphone.


A service interphone switch connects the amplifierto the handset jacks. In flight, the serviceinterphone switch should be closed (OFF position)to avoid the interference.

To operate the service interphone at the attendantstation, a switch called SVCE INTPH on theattendant handset is used. The flight attendant isconnected directly to service interphone amplifier.

The flight crew is connected to the serviceinterphone amplifier after selection on the ACP.

A service interphone switch connects the amplifierto the handset jacks. In flight, the serviceinterphone switch should be closed (OFF position)to avoid the interference.

To operate the service interphone at the attendantstation, a switch called SVCE INTPH on theattendant handset is used. The flight attendant isconnected directly to service interphone amplifier.

The flight crew is connected to the serviceinterphone amplifier after selection on the ACP.

HF SystemHF System

HF SystemHF System

Function. Operating frequency. No. of HF systems on A/C. HF system components. Precautions

Function. Operating frequency. No. of HF systems on A/C. HF system components. Precautions

High Frequency Communication System(HF)

High Frequency Communication System(HF)

Function: It permits both long range communication (by

making use of the sky wave phenomena) and shortwave communication (through the direct groundwave) between 2 A/Cs or an A/C and GND station.

The sky wave phenomena means that the HFsignal suffers from multi reflections between theionized air layer and the earth surface until thesignal reaches its destination.

Function: It permits both long range communication (by

making use of the sky wave phenomena) and shortwave communication (through the direct groundwave) between 2 A/Cs or an A/C and GND station.

The sky wave phenomena means that the HFsignal suffers from multi reflections between theionized air layer and the earth surface until thesignal reaches its destination.

HF (contd)HF (contd)

HF (contd)HF (contd)

Operating frequency: From 2 to 30 MHZ.

No. of HF systems on A/C: There are 2 HF systems on the most A/Cs with only

one antenna.

Operating frequency: From 2 to 30 MHZ.

No. of HF systems on A/C: There are 2 HF systems on the most A/Cs with only

one antenna.

HF System ComponentsHF System Components

AntennaAntenna CouplerCoupler

TransceiverTransceiver

AMUAMU ACPACP

SELCAL decoderSELCAL decoderRMP

(RTP)RMP(RTP)

HF ANTENNAHF ANTENNA

HF ANTENNA COUPLERSHF ANTENNA COUPLERS

HF AntennasHF Antennas

RMP 1RMP 1

RMP 3RMP 3

RMP 2RMP 2

Radio Management Panel (RMP)Radio Management Panel (RMP)

HF System ComponentsHF System Components

1- Antenna:- one antenna both the 2 HFs.- Its location on the vertical stabilizer.- Used for both Tx and Rx.2- Coupler:- It is used to match the antenna and T.L impedance

to the transceiver I/P impedance.- Note: the lighting arrestor is a part of the coupler

used to absorb any spikes.3- Transceiver:- It performs both Tx and Rx.- It performs the modulation process either AM or

USB.

1- Antenna:- one antenna both the 2 HFs.- Its location on the vertical stabilizer.- Used for both Tx and Rx.2- Coupler:- It is used to match the antenna and T.L impedance

to the transceiver I/P impedance.- Note: the lighting arrestor is a part of the coupler

used to absorb any spikes.3- Transceiver:- It performs both Tx and Rx.- It performs the modulation process either AM or

USB.

HF System Components (contd)HF System Components (contd)

4- AMU:- The AMU is the interface between the audio signal,

the transceiver and microphones.5- SELCAL:- It alerts the crew when the A/C receives a call on

the HF.6- RMP:- It sends the tuning frequencies , tuning data and

mode information to the transceiver.

4- AMU:- The AMU is the interface between the audio signal,

the transceiver and microphones.5- SELCAL:- It alerts the crew when the A/C receives a call on

the HF.6- RMP:- It sends the tuning frequencies , tuning data and

mode information to the transceiver.

PrecautionsPrecautions

Dont transmit using the HF duringrefueling or defueling.

Make sure that personnel stay away whiletransmission because of its high power.

Dont transmit using the HF duringrefueling or defueling.

Make sure that personnel stay away whiletransmission because of its high power.

VHF SystemVHF System

VHF SystemVHF System

Function. Operating frequency. No. of VHF systems on A/C. VHF system components. VHF modes of operation.

Function. Operating frequency. No. of VHF systems on A/C. VHF system components. VHF modes of operation.

Very High Frequency Communication System(VHF)

Very High Frequency Communication System(VHF)

Function: It permits voice and data communication for line of

sight distances (distances arent too long and notoverseas).

Operating frequency: From 118 to 150 MHZ with channel spacing 25 KHZ.

No. of VHF systems on A/C: 3 VHFs, VHF 3 used for ACARS system.

Function: It permits voice and data communication for line of

sight distances (distances arent too long and notoverseas).

Operating frequency: From 118 to 150 MHZ with channel spacing 25 KHZ.

No. of VHF systems on A/C: 3 VHFs, VHF 3 used for ACARS system.

VHF2 ANTENNAVHF2 ANTENNA



VHF ANTENNASVHF ANTENNAS

VHF System ComponentsVHF System Components

The VHF system components are the same of theHF system but not including the coupler becauseof the high frequency operation.

A duplixer may be used after the antenna toswitch it between Tx and Rx. When energized, theantenna in Tx while when de-energized, theantenna in Rx.

The VHF system components are the same of theHF system but not including the coupler becauseof the high frequency operation.

A duplixer may be used after the antenna toswitch it between Tx and Rx. When energized, theantenna in Tx while when de-energized, theantenna in Rx.

AntennaAntenna

TransceiverTransceiver

AMUAMU ACPACP

SELCAL decoderSELCAL decoderRMP

(RTP)RMP(RTP)

VHF modes of operationVHF modes of operation

1- Transmit Mode:- The audio signal is fed from Mic to the modulator

to be modulated and power amplified.

2- Receive Mode:- The signal from GND station is fed to the Rx via the

antenna relay which connects the antenna to thereceiver.

- Tuning is performed through the RMP.

1- Transmit Mode:- The audio signal is fed from Mic to the modulator

to be modulated and power amplified.

2- Receive Mode:- The signal from GND station is fed to the Rx via the

antenna relay which connects the antenna to thereceiver.

- Tuning is performed through the RMP.

Component LocationComponent Location

SELCAL SystemSELCAL System

SELCAL SystemSELCAL System

Function. Operation. Main system components. SELCAL code.

Function. Operation. Main system components. SELCAL code.

SELCAL SystemSELCAL System Function: It relief the crew from continuous monitoring the

radio receivers by giving an indication when thecaptain has an incoming call on HF or VHF. Operation:

Function: It relief the crew from continuous monitoring the

radio receivers by giving an indication when thecaptain has an incoming call on HF or VHF. Operation:

HF 1,2HF 1,2

SELCALdecoderSELCALdecoder

AMUAMU

ACPACP

SELCAL Coding switch

SELCAL Coding switch

VHF 1,2,3VHF 1,2,3

WEUWEU SpeakersSpeakers

CALL (in amber color)CALL (in amber color)

ChimeChime

Like programmingpinsLike programmingpins

Main System ComponentsMain System Components1- HF &VHF transceivers:- The transceiver receives the A/C SELCAL code from

GND station and sends it to the SELCAL decoder.

2- SELCAL decoder:- The SELCAL decoder compares the A/Cs stored

code with the code received from transceiver. Ifthey are identical, the coder sends an OK signal tothe AMU.

1- HF &VHF transceivers:- The transceiver receives the A/C SELCAL code from

GND station and sends it to the SELCAL decoder.

2- SELCAL decoder:- The SELCAL decoder compares the A/Cs stored

code with the code received from transceiver. Ifthey are identical, the coder sends an OK signal tothe AMU.

Main System ComponentsMain System Components

3- AMU:- The AMU sends a chime request to the WEU, a

signal to the ACP to turn on the amber CALL lighton the Rx system.

4- Warning Electronic Unit (WEU):

- It generates the chime signal and sends it to thespeakers.

3- AMU:- The AMU sends a chime request to the WEU, a

signal to the ACP to turn on the amber CALL lighton the Rx system.

4- Warning Electronic Unit (WEU):

- It generates the chime signal and sends it to thespeakers.

SELCAL Code.SELCAL Code.

4 letters from A to S except I, N and O as eachletter represents a frequency, for ex: A= 312.6 HZ.

Each code is consists of two two-letter pairs. Eachtwo pair must have the first letter lower inalphabet than the second, i.e. a code could be ABnot BA.

The GND station carries the code on the HF or VHFcarrier and sends it to the A/C.

The SELCAL decoder receives the code either fromthe GND station or from the SELCAL code panel.

4 letters from A to S except I, N and O as eachletter represents a frequency, for ex: A= 312.6 HZ.

Each code is consists of two two-letter pairs. Eachtwo pair must have the first letter lower inalphabet than the second, i.e. a code could be ABnot BA.

The GND station carries the code on the HF or VHFcarrier and sends it to the A/C.

The SELCAL decoder receives the code either fromthe GND station or from the SELCAL code panel.

SELCAL CODE PANELSELCAL CODE PANEL

Passenger Address System (PA).Passenger Address System (PA).


Function. System components. Operation

Function. System components. Operation


Function:- Voice announcements (flight crew, attendants,

recorded announcements).- Boarding music.- Chime signals.

Note the inputs priorities.

Function:- Voice announcements (flight crew, attendants,

recorded announcements).- Boarding music.- Chime signals.

Note the inputs priorities.

System ComponentsSystem Components

1- Microphone or handset:- It is used by the crew to make the announcements

and send it to the passengers.2- Pre-recorded announcement machine (PRAM):- It contains tapes for the BGM audio (4 channels)

and a flash card for pre-recorded announcements.3- PA Controller:- Contains the stored announcements media for PES

audio (12 channels).- Select the highest priority audio and sends it to the

speakers.

1- Microphone or handset:- It is used by the crew to make the announcements

and send it to the passengers.2- Pre-recorded announcement machine (PRAM):- It contains tapes for the BGM audio (4 channels)

and a flash card for pre-recorded announcements.3- PA Controller:- Contains the stored announcements media for PES

audio (12 channels).- Select the highest priority audio and sends it to the

speakers.

System Components (contd)System Components (contd)4- Loudspeakers5- AMU6- Chime generator ( embedded in PA controller) :- It is used when the captain talks to the attendants

or when a passenger call the attendants.

4- Loudspeakers5- AMU6- Chime generator ( embedded in PA controller) :- It is used when the captain talks to the attendants

or when a passenger call the attendants.

AMUAMU

ChimesChimesPA ControllerPA Controller

PRAMPRAM

HandsetsHandsets

SpeakersSpeakers

OperationOperation

From cockpit:- Directly using the external handset and press PTT

or using the ACP by pressing PA and hold + PTT. From cabin:- Using the attendant PA sw and select the required

zone. BGM operation:- The FAP controls: (1) the BGM. (2) the pre-recorded announcements. (3) Reset the passenger call

From cockpit:- Directly using the external handset and press PTT

or using the ACP by pressing PA and hold + PTT. From cabin:- Using the attendant PA sw and select the required

zone. BGM operation:- The FAP controls: (1) the BGM. (2) the pre-recorded announcements. (3) Reset the passenger call

PASSENGERADDRESSPASSENGERADDRESS

PASSENGERADDRESSPASSENGERADDRESS

Cockpit Voice Recorder (CVR)Cockpit Voice Recorder (CVR)


Function. CVR inputs. Functional description. Operational conditions. Panel description.

Function. CVR inputs. Functional description. Operational conditions. Panel description.


Function:- It continuously records the last 30 minutes for

magnetic tape (2 hrs for S.S CVR) when activatedmanually or automatically.

- It records the flight crew communication,conversations and warnings.

- It records the audio from the AMU and CVR areamic.

Function:- It continuously records the last 30 minutes for

magnetic tape (2 hrs for S.S CVR) when activatedmanually or automatically.

- It records the flight crew communication,conversations and warnings.

- It records the audio from the AMU and CVR areamic.

Cockpit Voice Recorder (contd)Cockpit Voice Recorder (contd)

CVR inputs (channels):- Captain - F/O- 3rd occupant

- Area Mic (Hot Mic).

CVR inputs (channels):- Captain - F/O- 3rd occupant

- Area Mic (Hot Mic).


AMUAMU CVRCVR

CVRpanelCVR

panelCVR MicCVR Mic

ParkingbrakeParkingbrake

Capt.Capt.F/OF/O

3rd Occup.3rd Occup.


Functional description:- The audio signal of the Capt., F/O & 3rd Occp. are

fed to the CVR through the AMU.- The audio signal from the area mic is fed directly to

the CVR.

Functional description:- The audio signal of the Capt., F/O & 3rd Occp. are

fed to the CVR through the AMU.- The audio signal from the area mic is fed directly to

the CVR.

SOLID STATE COCKPIT VOICE RECORDER (SSCVR)SOLID STATE COCKPIT VOICE RECORDER (SSCVR)

ACCESSDOOR

ACCESSDOOR

Operational ConditionsOperational Conditions

The CVR has 5 operational conditions: Automatically during flight. Automatically after the 1st engine run. Automatically for only 5 minutes after the 2nd

engine shut down then stop. Automatically for 5 minutes only after

connecting the external power then stop. Manually by pressing GND CTL ON sw in the

overhead panel.

The CVR has 5 operational conditions: Automatically during flight. Automatically after the 1st engine run. Automatically for only 5 minutes after the 2nd

engine shut down then stop. Automatically for 5 minutes only after

connecting the external power then stop. Manually by pressing GND CTL ON sw in the

overhead panel.

SSCVRSSCVR

Panel DescriptionPanel Description

SHINY ORANGENOT BLACK

SHINY ORANGENOT BLACK


Erase conditions: A/C on GND. Parking brake is set to ON. Press the erase pb for 2 seconds.

Test conditions: A/C on GND. Parking brake is set to ON. Press the test switch.

Erase conditions: A/C on GND. Parking brake is set to ON. Press the erase pb for 2 seconds.

Test conditions: A/C on GND. Parking brake is set to ON. Press the test switch.


Note:- The CVR works under water by the help of the

under Water Locator Beacon (ULB) on the CVRface. The ULB begins to sends an ultra sonic wavesof 37.5 KHz which can be sensed to 2000 metersunder water. The CVR sends the waves for 30 daysin a rate = a pulse per second.

- The area Mic amplifier is found behind the F/Oback.

Note:- The CVR works under water by the help of the

under Water Locator Beacon (ULB) on the CVRface. The ULB begins to sends an ultra sonic wavesof 37.5 KHz which can be sensed to 2000 metersunder water. The CVR sends the waves for 30 daysin a rate = a pulse per second.

- The area Mic amplifier is found behind the F/Oback.

Satellite Communication System (SATCOM)Satellite Communication System (SATCOM)

Satellite Communication System (SATCOM)Satellite Communication System (SATCOM)

Function. Main System Components. A/C SATCOM Equipments. Modes of Operation.

Function. Main System Components. A/C SATCOM Equipments. Modes of Operation.

SATCOMSATCOM Function: It provides 2 way communication (voice, data and

fax) for all A/Cs operating all over the world.

Main System Components: Space Segment. Ground Earth Station. Aircraft SATCOM Equipments.

Function: It provides 2 way communication (voice, data and

fax) for all A/Cs operating all over the world.

Main System Components: Space Segment. Ground Earth Station. Aircraft SATCOM Equipments.

Space SegmentSpace Segment

It is an Inmersat satellite & associated groundsupport facilities.

Satellites located in a geostationary orbit (36000km above the earth).

It uses 4 operational satellites to cover all theworld.

It is an Inmersat satellite & associated groundsupport facilities.

Satellites located in a geostationary orbit (36000km above the earth).

It uses 4 operational satellites to cover all theworld.

Ground Earth Station (GES)Ground Earth Station (GES)

It is a GND fixed earth radio station capable ofcommunicating with the A/C via satellites.

It provides the connection between the satellitesystem and the international telecommunicationnetwork.

It consists of a dish antenna, RF system, AccessingControl Signaling Equipment.

It contains a digital voice coding and decoding unitto covert the analog voice to a digital code.

It is a GND fixed earth radio station capable ofcommunicating with the A/C via satellites.

It provides the connection between the satellitesystem and the international telecommunicationnetwork.

It consists of a dish antenna, RF system, AccessingControl Signaling Equipment.

It contains a digital voice coding and decoding unitto covert the analog voice to a digital code.

Aircraft SATCOM EquipmentsAircraft SATCOM Equipments

SDUSDURFURFU

AttenuatorAttenuator

HPAHPA LNA/DIPLNA/DIP AntennaAntenna

BSUBSU

FAXFAXAMUAMUCTUCTU

ACARSACARSCPMUCPMU

Aircraft SATCOM EquipmentsAircraft SATCOM Equipments

Top mounted high gain antenna (HGA):- It is an antenna array consists of 39 antennas,

used for both Tx & Rx.(2) Beam Steering Unit (BSU):- It sends the pointing data from RFU to the HGA

taking the command from the SDU.(3) Low Noise Amplifier/Diplexer (LNA/DIP): LNA: increases the signal strength . DIP: select either Tx or Rx.

Top mounted high gain antenna (HGA):- It is an antenna array consists of 39 antennas,

used for both Tx & Rx.(2) Beam Steering Unit (BSU):- It sends the pointing data from RFU to the HGA

taking the command from the SDU.(3) Low Noise Amplifier/Diplexer (LNA/DIP): LNA: increases the signal strength . DIP: select either Tx or Rx.

Aircraft SATCOM Equipments (contd)Aircraft SATCOM Equipments (contd)

(4) High Power Amplifier (HPA):- It is a class A amplifier used to increase the signal

strength.(5) Attenuator (ATT):- It adjust the RFU O/P to the HPA I/P signal level.(6) Radio Frequency Unit (RFU):- It changes converts the radio signal to a digital

form and vice versa.- Mixes the RF signal from the SDU with an RF

signal internally generated in it then sends themixed signal to the HPA via the attenuator.

(4) High Power Amplifier (HPA):- It is a class A amplifier used to increase the signal

strength.(5) Attenuator (ATT):- It adjust the RFU O/P to the HPA I/P signal level.(6) Radio Frequency Unit (RFU):- It changes converts the radio signal to a digital

form and vice versa.- Mixes the RF signal from the SDU with an RF

signal internally generated in it then sends themixed signal to the HPA via the attenuator.

Aircraft SATCOM Equipments (contd)Aircraft SATCOM Equipments (contd)

(7) Satellite Data Unit (SDU):- It is an interface to the SATCOM and a controller.- It contains the system operating software ,

position and frequency of the satellite.

(7) Satellite Data Unit (SDU):- It is an interface to the SATCOM and a controller.- It contains the system operating software ,

position and frequency of the satellite.

SDUSDURFURFU

Att.Att.

HPAHPA LNA/DIPLNA/DIP AntennaAntenna

BSUBSU

FAXFAXAMUAMUCTUCTU

ACARSACARS

CPMUCPMU

SATCOM modes of operationSATCOM modes of operation

The SATCOM uses 5 channels for voice & 1channel for data.

Voice operation:- The voice comes through the AMU or CTU to the

SDU.(2) Data operation:- The data is transmitted and received using

ACARS & CTU.

The SATCOM uses 5 channels for voice & 1channel for data.

Voice operation:- The voice comes through the AMU or CTU to the

SDU.(2) Data operation:- The data is transmitted and received using

ACARS & CTU.

Passenger Entertainment System (PES)Passenger Entertainment System (PES)


Function. Operation. System Components.

Function. Operation. System Components.


Function:- It allows the transmission of the pre-recorded

music, video sounds and passenger addressinformation to the passenger.

- The passenger hear the audio signal via theheadset and control the volume using thepassenger control unit (PCU).

Function:- It allows the transmission of the pre-recorded

music, video sounds and passenger addressinformation to the passenger.

- The passenger hear the audio signal via theheadset and control the volume using thepassenger control unit (PCU).

Passenger Entertainment System (contd)Passenger Entertainment System (contd)

Operation:- The Main Multiplexer (MM) receives the audio

signal from: Audio Reproducer (AR). Video System Control Unit (VSCU). Passenger Address (PA). - The MM multiplexes the parallel audio channels

and make them ready for distributing through thecabin.

Operation:- The Main Multiplexer (MM) receives the audio

signal from: Audio Reproducer (AR). Video System Control Unit (VSCU). Passenger Address (PA). - The MM multiplexes the parallel audio channels

and make them ready for distributing through thecabin.

System ComponentsSystem Components

MMMM WDBWDB SEBSEB PCUPCU SpeakersSpeakersAudio signalAudio signal

System Components (contd)System Components (contd)

Main Multiplexer (MM):- It accepts max. 18 channels.- Multiplexes, digitalizes & control the audio

channels and fwd them to SEB via WDB.(2) Wall Disconnect Box (WDB):- It provides power and data to all SEBs into the

cabin.- They are 6 LRUs: 3 left & 3 right- Installed along each lower side wall in the cabin.

Main Multiplexer (MM):- It accepts max. 18 channels.- Multiplexes, digitalizes & control the audio

channels and fwd them to SEB via WDB.(2) Wall Disconnect Box (WDB):- It provides power and data to all SEBs into the

cabin.- They are 6 LRUs: 3 left & 3 right- Installed along each lower side wall in the cabin.

System Components (contd)System Components (contd)(3) Seat Electronic Box (SEB):- It distribute the audio signal to the PCUs.- It supplies from 2 to 3 seats (max. 3 PCUs).(4) Passenger Control Unit (PCU):- The PCU location is on the passenger seat arm set.- It is responsible for: Audio channel selection (1:12 channels). Volume control. Connect the headphone to its jack.- A digital PCU (DPCU) performs also the following: Games interactive. Phone set keys. LCD screen control

(3) Seat Electronic Box (SEB):- It distribute the audio signal to the PCUs.- It supplies from 2 to 3 seats (max. 3 PCUs).(4) Passenger Control Unit (PCU):- The PCU location is on the passenger seat arm set.- It is responsible for: Audio channel selection (1:12 channels). Volume control. Connect the headphone to its jack.- A digital PCU (DPCU) performs also the following: Games interactive. Phone set keys. LCD screen control

Passenger Entertainment System (contd)Passenger Entertainment System (contd)

Note: PSE is controlled from the FAP (PES

ON/OFF pb sw)

Note: PSE is controlled from the FAP (PES

ON/OFF pb sw)

Aircraft Communication Addressing andReporting System (ACARS)




Function. Associated Systems. Main System Components.

Function. Associated Systems. Main System Components.

ACARSACARS

Function: It is used to Tx / Rx both data and voice and

process the signal in digital form.

Associated Systems : VHF 3 SATCOM system.

Function: It is used to Tx / Rx both data and voice and

process the signal in digital form.

Associated Systems : VHF 3 SATCOM system.

Main System ComponentsMain System Components

Main System Components (contd)Main System Components (contd)

ACARS Management Unit:- It manages all the tasks related to the ACARS

system for both Tx & Rx.

(2) VHF 3:- It is used in 2 modes: Radio Mode: ACARS is tuned by ACARS MU or

the 3 connected RMPs. Data Mode: The VHF 3 transceiver is selected to

the data mode through the ACARS MU.

ACARS Management Unit:- It manages all the tasks related to the ACARS

system for both Tx & Rx.

(2) VHF 3:- It is used in 2 modes: Radio Mode: ACARS is tuned by ACARS MU or

the 3 connected RMPs. Data Mode: The VHF 3 transceiver is selected to

the data mode through the ACARS MU.

Main System Components (contd)Main System Components (contd)(3) MCDU:- When the ACARS is selected on the MCDU menu,

the connection between them is initiated.(4) Printer:- It is an output peripheral receive data from other

computers connected to the MCDU.(5) Data Management Unit (DMU):- It is responsible for data processing.(6) Radio Management Panel (RMPs):- Its function is the VHF 3 tuning in radio mode.

(3) MCDU:- When the ACARS is selected on the MCDU menu,

the connection between them is initiated.(4) Printer:- It is an output peripheral receive data from other

computers connected to the MCDU.(5) Data Management Unit (DMU):- It is responsible for data processing.(6) Radio Management Panel (RMPs):- Its function is the VHF 3 tuning in radio mode.

Main System Components (contd)Main System Components (contd)

(7) Flight Warning Computer (FWC) & System DataAcquisition Computer (SDAC):

- They are responsible for warnings display.(8) Centralized Fault display Interface (CFDIU): - Its function is to collect all the faults in all the

systems.

(7) Flight Warning Computer (FWC) & System DataAcquisition Computer (SDAC):

- They are responsible for warnings display.(8) Centralized Fault display Interface (CFDIU): - Its function is to collect all the faults in all the

systems.

MCDUMCDU

communication explain

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