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.

OFFSCALE

The OFFSCALE message shows on the ND when an RA or TA is outside the current ND display area. The TFC switch on the EFIS control panel must be set to ON to show the OFFSCALE message. If an 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.

This message shows in these navigation display modes:

· Center (CTR) MAP* Expanded (EXP) MAP

· Expanded (EXP) VOR

· Expanded (EXP) APP.

TRAFFIC

The red TRAFFIC message shows any time there is an RA. The amber TRAFFIC message shows any time there is a TA and no RA. The TRAFFIC message shows in all ND formats with the TFC switch on the EFIS control panel set to ON or OFF.

Date: 2016-03-03; view: 1108