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PWS -predictive windshear
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TCAS -traffic alert and collision avoidance system
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RA -resolution advisory
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REL -relative
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TCAS -traffic alert and collision avoidance system
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TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM -INTRODUCTION
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TCAS -GENERAL DESCRIPTION
General
The traffic alert and collision avoidance system (TCAS) interrogates other airplanes to get altitude, range, and bearing data. TCAS uses the replies and inputs from other onboard airplanes systems to calculate traffic avoidance data.
General Description
These are the TCAS components:
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ATC antennas
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Transponder panel
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TCAS directional antennas
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TCAS computer.
TCAS interfaces with these other system components:
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Left and right airplane information management system (AIMS) cabinets
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Left and right ATC/Mode S transponders
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Left and right warning electronic units (WEUs)
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Left and right radio altimeters
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Left and right weather radar receiver-transmitters (R/Ts)
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Left and right proximity switch electronics units (PSEUs)
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Ground proximity warning computer (GPWC).
Suppression
The TCAS computer connects to the DME interrogators and the ATC transponders through a suppression splitter.
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -GENERAL DESCRIPTION
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TCAS -COMPONENT LOCATIONS
Main Equipment Center
The TCAS computer and the DME/ATC/TCAS suppression splitter are in the main equipment center.
Flight Deck
These are the components in the flight deck that interface with TCAS:
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Left EFIS control panel
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Captain primary flight display (PFD)
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Captain navigation display (ND)
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Right EFIS control panel
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First officer PFD
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First officer ND.
The transponder panel is on the P8 aft aisle stand panel.
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -COMPONENT LOCATIONS
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TCAS -ANTENNA LOCATION
General
The top TCAS antenna is on top of the fuselage. The bottom TCAS antenna is on bottom of the fuselage.
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777 AIRCRAFT MAINTENANCE MANUAL
TCAS -ANTENNA LOCATION
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777 AIRCRAFT MAINTENANCE MANUAL
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TCAS -POWER, ANTENNAS, ANALOG DISCRETE INTERFACES AND PROGRAM PINS
General
The TCAS computer has interfaces with these components:
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Overhead circuit breaker panel
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Top and bottom TCAS directional antennas
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Left AIMS cabinet
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Right AIMS cabinet
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Air/ground relay
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Ground proximity warning computer (GPWC)
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Proximity sensor electronics unit (PSEU) 1
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PSEU 2
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DME/ATC/TCAS suppression splitter
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Left warning electronic unit (WEU)
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Left WXR RT
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Right WXR RT
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Right WEU.
There are program pins to supply control of the TCAS computer.
Power
The TCAS computer gets 115v ac from the left ac secondary 2 bus, through the overhead circuit breaker panel.
Antennas
There are two TCAS directional antennas, one on the top and one on the bottom of the airplane. The TCAS directional antennas receive traffic airplane reply signals. They also transmit the TCAS interrogation signals.
EFFECTIVITY
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AIMS -Display Status
An analog discrete from either AIMS cabinet goes to the TCAS computer when the display function of AIMS fails. When the TCAS computer gets this discrete, the TCAS computer does not do these functions:
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