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FCOM 19 AUG 10
GENERAL
Applicable to: ,
The TCAS:
Detects any aircraft equipped with an ATC ‐ transponder 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 the intruders flying within a maximum range of 100 nm
(depending on aircraft configuration and external conditions), and within a maximum vertical
separation of 9 900 ft above and below the threatened aircraft.
GENERAL
Applicable to:
The TCAS:
Detects any aircraft equipped with an ATC ‐ transponder 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 the intruders flying within a maximum range of
approximately 80 nm (depending on aircraft configuration and external conditions), and within a
maximum vertical separation of 9 900 ft above and below the threatened aircraft.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 2/10
FCOM 19 AUG 10
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
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 3/10
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 4/10
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 5/10
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
LEVEL INTRUDER POSITION DISPLAYED INFORMATION
Proximate ‐ no collision threat
‐ intruder in vicinity to a/c (closer than
6 nm in lateral and ± 1 200 ft in
vertical direction)
‐ ND : intruder position
Traffic Advisory (TA) ‐ potential collision threat
‐ TAU is about 40 s
‐ ND : intruder position
‐ Aural message
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 6/10
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
‐ intruder within a range greater than
6 nm or above ± 1 200 ft in vertical
direction
‐ any non proximate, TA, RA
intruders within the surveillance
envelope (lateral range : closer
than 30 nm vertical range : Refer
to DSC-34-80-10 ADVISORY
INHIBITION)
‐ ND : intruder position
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 7/10
FCOM 19 AUG 10
TA / RA THRESHOLDS
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
TCAS - DESCRIPTION
A330/A340 FLEET DSC-34-80-10 P 8/10
FCOM 19 AUG 10
TA / RA THRESHOLDS
　
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