flight instrumentsFAA-published sample question (IRH, Aug 2021)
The primary flight display (PFD) receives attitude and heading data from the
A
AHRS.✓ Correct Answer
B
vacuum system.
C
pitot-static system.
Explanation
In an electronic flight display, the attitude and heading information on the PFD comes from the attitude and heading reference system (AHRS), which uses solid-state gyros, accelerometers and a magnetometer. The pitot-static system feeds the air data computer (airspeed, altitude, vertical speed), and a vacuum system drives only conventional gyros.
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