The Air Data Computer receives static air pressure measurements from the ___ to display information on the PFD.

• A. Pitot-static probe
• B. Total air temperature probe
• C. Static port connector
• D. Static pressure sensor line

Answer: (A)

Static pressure for the air data computer comes from the pitot-static system, which is housed in the pitot-static probe. The PCA/ADC uses this static pressure (along with total pressure from the pitot tube) to compute airspeed, altitude, and vertical speed, which are then displayed on the PFD. The total pressure from the pitot tube is used separately to determine dynamic pressure for airspeed, but the static pressure input used for altitude and vertical speed comes from the static ports tied to the pitot-static probe.

The other options don’t fit because a total air temperature probe provides temperature data, not static pressure; a static port connector or static pressure sensor line are part of the plumbing, but the actual source is the pitot-static probe that contains the static ports feeding the ADC.