Apollo MX20 User's Guide download pdf (Page 70)

Traffic Depiction

It is important to note that not all traffic may be displayed

and that TIS-A is only an aide to visual acquisition.

TIS-A is there to assist you to visually acquire other

aircraft around you and does not provide any information

other than making you aware of other aircraft around you

that the Mode-S terminal radar can “see.” This may not

include all traffic around you. Only transponder-equipped

aircraft that are visible to the terminal radar sensor will be

broadcast to your aircraft. Up to eight (8) targets may be

displayed at any given time. This is a limitation of the

ground sensor since the ground sensor provides the data

via the radar pulse.

Your position (ownship symbol) is located at the tip of the

triangle icon at the bottom center of the screen. The traffic

function is always shown in heading mode, meaning that

track-based flight plan information is not overlaid. Traffic

can also be shown on the Custom Map and in a small

thumbnail view presented in the upper left corner of the

screen.

Traffic targets are displayed relative to the ownship

symbol and include a relative altitude in 100’s of feet

above (+) or below (-) your aircraft’s altitude. Targets

also include a climb (£) or descent arrow (¤) next to the

relative altitude when the climb or descent rates are

greater than 500 feet per minute.

Targets are displayed at full brightness for the first six (0

to 6) seconds. If the TIS-A data is not refreshed, the

targets will be displayed at a reduced brightness for the

next six (6 to 12) seconds during an interval known as

“coasting,” and removed from the display after 12 seconds.

“Coasting” usually results from the TIS-A sensor missing

a radar sweep. This typically happens because the aircraft

antenna line of sight to the radar has been obstructed,

most likely by either terrain or because the aircraft is

banking.

Detailed Operation

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Apollo MX20 User's Guide Page 70