A white edge diamond on TCAS indicates what?

• A. Other Traffic
• B. Weather
• C. Terrain
• D. Ground traffic

Answer: (A)

In TCAS, the symbols on the display are used to identify what kind of target you’re seeing. A white-edged diamond is the symbol used for other aircraft detected by the system. It signals “other traffic”, not weather or terrain. Weather is shown by color-coded returns on the weather radar display, and terrain/obstacles are indicated by TAWS/EGPWS cues, not this diamond symbol. Ground traffic isn’t typically shown by TCAS. So the white-edged diamond specifically means there’s another aircraft in the vicinity TCAS is tracking.