TACAN Radio Navigation System

Power Supply

• SEPDC 1 supplies TACAN 1 and RA transceiver 1
• SEPDC 2 supplies TACAN 2 and RA transceiver 2
• EEPDC supplies RA transceiver 1 in emergency mode
• PSM's ISU 1 is supplied by SEPDC 1
• WXR antenna is supplied by PSM at 200 VDC

TACAN

• Transceiver 1 located at 1100VU
• Transceiver 2 located at 1800VU
• Antenna 1 and 3 on top, antenna 2 and 4 on bottom
• Indication on NTD: TACAN 1 lower left, TACAN 2 lower right

Radio Altimeter (RA)

• 2 RA transceivers, 1 transmitting and 1 receiving antenna per receiver
• 4 antennas
• RA height provided to CDS and HUDS through ADCN (IOM)
• RA height data also sent through direct link to FWS and AFS
• RA transceiver 1 located on left side, RA transceiver 2 on right side
• Antenna located in bottom area

ISS

• Consists of 2 ISU, WXR antenna, 2 TCAS antennas, and WXR control panel
• ISU 1 situated at 1000VU, ISU 2 situated at 1000VU
• Normal mode: all functions delivered by ISU 1 (master)
• Mixed mode: if 1 function is lost, functions are shared by ISU 2 (master)
• Downgraded mode: TCAS failure or at least 2 faults in the system, ISU selected for WXR function is the master

Weather Radar (WXR)

• WXR antenna is supplied by PSM at 200 VDC
• Detailed description: In single configuration, RTU 2 is a dummy RTU, enabling stowage plugs from antenna drive unit and ISU

TAWS

• GPWS mode 5 active less than 1000 ft AGL and L/G down

TCAS

• Military radar component: MMRP, Military radar control panel, ISU 1, and Radar antenna assembly
• Power supply: Military function (high-resolution ground map image display NTD) and Air-to-Air function
• MMRP located at 1100VU
• Data interface of MMRP with A/C systems performed through Ethernet using ISU as gateway

EVS

• Interconnection with other systems ensured by both HUDC
• Detailed description: External interfaces; image automatic adjustment is continuously performed by EVS based on alignment parameters stored in HUD PMM
• Detailed control and indications: EVS FAULT, EVS OVERHEAT, EVS DEGRADED

VOR/DME/MMR/ADF

• VOR/DME/MMR/ADF test switch: more than 3s
• ISIS located on main instrument panel
• Standby compass located on overhead panel, top of windshield center post
• Standby static located on left and right sides
• Standby pitot located on right side

GADIRU

• GADIRU 1 & 3 using ARINC 429 > ISIS
• ISIS unit: detailed controls and indications
• ISIS: air data indications: Mach number visible above 0.5 and disappears below 0.45

Radio Navigation System

• Tuning and displays: resume 2 tuning: auto FMS/manual FMS CDS RMP... pas RMP3 en nav, si FMC fail en manual utiliser RMP
• 2 tuning: Automatic (supported by FMS) and Manual (supported by FMS, CDS, RMPs)
• RMP 3 not used for navigation
• In case of double FMC failure in manual mode, RMP will be the only means to tune

MMR

• 2 functions: Landing system (ILS MLS) and Civil GPS (FMS)
• Power supply: MMR1 supplied by EEPDC at 115 VAC, MMR2 supplied by SEPDC 2 at 115 VAC
• Location: MMR 1 located at lower deck avionics bay 1300VU, MMR 2 located at main avionics bay 1200VU
• 2 GPS antennas, 1 MLS omni-directional antenna at front top, MLS landing antenna at lower part of nose fuselage

VOR/Marker

• VOR provides azimuth orientation to a VOR ground station
• Marker provides indication about the passage of the aircraft over the marker beacon transmitters
• VOR receives, decodes, and processes bearing information from VOR signals
• Power supply: AC EMERGENCY BUS supplies VOR/MKR 1 receiver at 115 VAC, SEPDC 2 supplies VOR/MKR 2 receiver at 115 VAC
• Location: VOR/Marker receiver located on the upper deck avionics bay (1100 and 1200)

DME

• Provides digital readout of slant distance and audio signal
• Consists of 2 interrogators and 2 antennas
• Power supply: SEPDC 1 supplies DME 1 interrogator, SEPDC 2 supplies DME 2 interrogator
• Location: DME interrogator 1 located at 1100VU, DME interrogator 2 located at 1200VU
• Antennas located at bottom fuselage

ADF

• Provides indication of the relating bearing and aural identification
• 1 antenna and 1 receiver
• Power supply: SEPDC 1 supplies ADF receiver
• Location: receiver located in the upper deck avionics bay at 1000VU, antenna located at bottom fuselage