Tcas - navigation display General

The TCAS computer puts traffic into these four groups:

• Other traffic shows as a white open diamond, and the altitude readout is white text

• Proximate traffic shows as a solid white diamond, and the altitude readout is white text

• 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. A vertical motion arrow is also shown if the airplane vertical speed is greater than 500 feet per minute (fpm). The traffic symbols show in these navigation display modes:

• Center (CTR) MAP

• Expanded (EXP) MAP

• Expanded (EXP) VOR

• Expanded (EXP) APP.

Range Data

Push the TFC switch on the EFIS control panel to show TCAS data. The range the EFIS control panel selects also shows on the ND.

Altitude Readout

Relative altitude shows in the same color as the traffic symbol on the NDs.

Altitude Separation

The TCAS computer calculates the altitude separation between own airplane and the target. It uses the barometric altitudes of the airplanes to do this. 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 shows.

If the altitude separation cannot be calculated, the altitude

display does not show.

Absolute Altitude

The target sends barometric altitude to the TCAS computer. This altitude shows in thousands and hundreds of feet. If the traffic is above, the digits show above the traffic symbol. If the traffic is below, the digits show below the traffic.

If the altitude cannot be calculated, the altitude display does not show.

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.

The arrow points down if the traffic airplane goes down at a rate more than or equal to 500 fpm. The arrow points up if the traffic airplane is in a climb at a rate more than or equal to 500 fpm. The arrow does not show for rates less than 500 fpm.

Tcas Messages

The ND can show these messages for TCAS:

• TFC shows in cyan in the CTR MAP and EXP MAP, VOR and APP modes. It shows the TCAS traffic display is active. The TFC switch on the EFIS control panel must be set to ON.

• TA ONLY shows in cyan and in all modes. It shows that TCAS is not calculating RAs. It shows if the TFC switch on the EFIS control panel is set to ON or OFF.

• TCAS TEST shows in cyan and in all modes. It shows that TCAS is in the test mode. It shows if the TFC switch on the EFIS control panel is set to ON or OFF.

• TCAS TEST FAIL shows on two lines when in test mode and the TCAS has a failure. TCAS and FAIL show in amber and TEST shows in cyan. It shows if the TFC switch on the EFIS control panel is set to ON or OFF.

• TCAS FAIL shows in amber and in all modes. It shows that TCAS has failed. The TFC switch on the EFIS control panel must be set to ON.

• TCAS OFF shows on two lines in amber and in all modes. It shows that the ATC mode switch is not in TA or TA/RA. It shows if the TFC switch on the EFIS control panel is set to ON or OFF.