What are two ways of measuring air pressure at a terminal facility?

• A. TDWR / ITWS
• B. IDS / SIA
• C. TDLS / STARS
• D. ASI / DASI

Answer: (D)

Air pressure is used to determine airspeed through the pitot-static system. The two ways of measuring this pressure at a terminal facility are the Air Speed Indicator, which provides an analogue gauge reading of indicated airspeed, and the Digital Air Speed Indicator, which displays the same information in a digital format. Both rely on sensing dynamic pressure from the pitot tube and converting it into a usable speed reading. The other options are weather radar or automation systems used for navigation and data management, not instruments that measure air pressure for flight speed.