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available until the TERR STBY memo disappears. If selected, the terrain data display on ND is
automatically deselected when the TERR STBY memo is triggered.”
TERR OFF is displayed when the TERR pushbutton is switched OFF :
‐ It appears in green in flight phase 2, before the Take Off Configuration test is launched, and in
flight phase 6.
‐ It appears in amber in flight phase 2, after the Take Off Configuration test, and in flight phases
3, 4, 5, 7, 8 and 9.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - ELECTRICAL SUPPLY
A318/A319/A320/A321 FLEET DSC-34-70-60 P 1/2
FCOM 19 AUG 10
BUS EQUIPMENT LIST
Applicable to: ALL
NORM EMER ELEC
AC DC AC
ESS
DC
ESS HOT
GPWS AC1
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - ELECTRICAL SUPPLY
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A318/A319/A320/A321 FLEET DSC-34-70-60 P 2/2
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-34-80-10 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The TCAS (Traffic alert and Collision Avoidance System) :
Detects any aircraft, equipped with transponders, ‐ flying in its vicinity ;
‐ Displays potential and predicted collision targets ;
‐ Issues vertical orders to avoid conflict.
The TCAS is normally independent of the ground-based air traffic control system.
The TCAS detection capability is limited to intruders flying within a maximum range of 30-40 nm
(depending on aircraft configuration and external conditions), and within a maximum altitude range of
9 900 ft (above and below the threatened aircraft).
MAIN COMPONENTS
Applicable to: ALL
The system includes :
‐ a single channel TCAS computer
‐ two TCAS antennas
‐ two mode S ATC transponders, one active the other in standby.
These transponders allow :
‐ interface between the ATC / TCAS control panel and the TCAS computer
‐ communication between the aircraft and intruders equipped with a TCAS system
‐ an ATC /TCAS control panel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-34-80-10 P 2/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-34-80-10 P 3/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-34-80-10 P 4/6
FCOM 19 AUG 10
PRINCIPLE
Applicable to: ALL
The TCAS interrogates transponder of intruders. From the transponder replies, the TCAS determines
for each intruder :
‐ its relative bearing
‐ its range and closure rate
‐ its relative altitude if available (ATC mode C or S)
Then the TCAS computes the intruder trajectory, the Closest Point of Approach (CPA) and the
estimated time (TAU) before reaching the CPA.
Each time the relative position of the intruder presents a collision threat, aural and visual advisories
are triggered.
TCAS optimizes vertical orders to ensure a sufficient trajectory separation and a minimal vertical
speed variation considering all intruders.
INTRUDER CLASSIFICATION
Applicable to: ALL
The intruders are classified in four levels :
LEVEL INTRUDER POSITION DISPLAYED INFORMATION
Proximate ‐ no collision threat
‐ intruder in the vicinity of the A/C
(closer than 6 nm laterally and ±
1 200 ft vertically)
‐ ND : intruder position
Traffic Advisory (TA) ‐ potential collision threat
‐ TAU is about 40 seconds
‐ ND : intruder position
‐ Aural messages
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
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FCOM 19 AUG 10
Continued from previous page
LEVEL INTRUDER POSITION DISPLAYED INFORMATION
Resolution Advisory (RA) ‐ real collision threat
‐ TAU is about 25 s
‐ ND : intruder position
‐ Aural messages
‐ PFD : vertical orders
• Maintain actual V/S (Preventive
Advisory) or
• Modify V/S (Corrective Advisory)
Other intruders �� ‐ no collision threat
‐ any non proximate, TA, RA within
the surveillance envelope (lateral
range : closer than 30 nm. vertical
range : Refer to DSC-34-80-20
　
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