*
Traffic advisory (TA) shows as a solid amber circle, and the altitude readout is amber text

*
Resolution advisory (RA) shows as a solid red square and the altitude readout is red text.

Each traffic symbol has an altitude readout and a vertical motion arrow. The traffic symbols show in one of these modes only:
*
Center (CTR) MAP

*
Expanded (EXP) MAP

*
Expanded (EXP) VOR

*
Expanded (EXP) APP.

Range Data
When you push the TFC switch on the EFIS control panel to show TCAS data, the range selected on the EFIS control panel shows on the ND.
Also, when you push the TFC switch, range arcs show.
EFFECTIVITY
BEJ ALL

TCAS Messages
The ND can show these messages for TCAS:
*
TFC shows in cyan in and all modes

*
TA ONLY shows in cyan and in all modes

*
TCAS TEST shows in cyan and in all modes

*
TCAS FAIL shows on two lines in amber, and in the CTR MAP and EXP MAP,VOR and APP modes

*
TCAS OFF shows on two lines in amber, and in the CTR MAP and EXP MAP,VOR and APP modes.

Altitude Separation
The TCAS computer uses the absolute altitude of the TCAS airplane and the traffic airplane to calculate the altitude separation. The altitude separation shows on the ND in hundreds of feet. If the traffic is above, the digits show above the traffic symbol with a plus (+) sign. If the traffic is below, the digits show below the traffic symbol with a minus (-) sign.
If the altitude separation is less than 100 feet, 00 feet shows.
If the altitude separation is NCD, the altitude readout does not show.
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TCAS -NAVIGATION DISPLAY

Vertical Motion Arrow
A vertical motion arrow shows on the right side of the traffic symbol. It is the same color as the traffic symbol. If the traffic airplane is in a descent, the arrow points down. If the traffic airplane is in a climb, the arrow points up.
OFFSCALE
The OFFSCALE message shows on the ND when a RA or TA is outside the ND range. If a RA is outside the ND range, the OFFSCALE message shows in red. If a TA is outside the ND range, the OFFSCALE message shows in amber. If both a TA and RA are outside the ND range, the OFFSCALE message shows in red.
TRAFFIC
The red TRAFFIC message shows any time there is a RA. The amber TRAFFIC message shows any time there is a TA. The TRAFFIC message shows in all ND formats.
RA and TA No-Bearing Traffic
The no-bearing RA and TA messages show on the ND when TCAS loses the bearing of the RA or TA traffic. When the landing gear is down, the bottom directional antenna becomes an omnidirectional antenna. When this happens, the bottom antenna cannot track the bearing of the intruder traffic, thus the bearing is NCD. Because of this, the no-bearing messages show on the ND. If a TA becomes no-bearing traffic, an amber TA with the range, altitude, and vertical motion arrow shows on the ND. If a RA becomes no-bearing traffic, a red RA with the range, altitude, and vertical motion arrow shows on the ND.
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TCAS -NAVIGATION DISPLAY

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TCAS -PRIMARY FLIGHT DISPLAY

General
These are the two types of TCAS advisories that can show on the PFD:
*
TCAS preventative down advisory

*
TCAS preventative up advisory.

These symbols only show for an RA when the function selector on the transponder panel is in the TA/RA or TA ONLY position and TCAS communicates with threat airplanes that have TCAS.
Description
The red advisories that show on the attitude display tells the flight crew to avoid this area.
The flight crew uses the advisories to avoid a possible collision with threat airplanes.
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777 AIRCRAFT MAINTENANCE MANUAL

TCAS -PRIMARY FLIGHT DISPLAY

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TCAS -AURAL MESSAGES

General
Aural advisory messages come on during traffic advisories (TA), resolution advisories (RA) and a TCAS system test.
Traffic Advisory Aural
When a traffic advisory occurs, the aural message TRAFFIC TRAFFIC comes on. This message tells the flight crew to monitor the ND for intruder traffic.
　
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