TCAS range options and mode for traffic display are?

• A. 5, 10, 20, 40; TFC
• B. 2, 4, 8, 16; TFC
• C. 6, 12, 24, 48; TFC
• D. 3, 9, 27, 81; TFC

Answer: (A)

The key idea is how TCAS lets you choose how far out you want to see other aircraft on the traffic display. TCAS provides a fixed set of four display ranges that increase in a doubling pattern—from the closest view to the widest view. This design keeps traffic information manageable while letting you quickly widen your view when needed. The mode shown for displaying traffic is TFC, which means you’re viewing traffic data on the TCAS display.

Why this is the best match: TCAS uses that four-range, doubling progression as its standard set, and TFC is the label used to indicate the traffic display mode. Other range sequences are not how TCAS typically presents its options, so they don’t fit the standard TCAS behavior.