Discussion
Assertion (A): Position error is tabulated on a calibration card for each aircraft type.
Reason (R): Local pressure at a static port depends on the flow field, which varies with attitude and speed.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains why the card is needed. Position error is not a constant: it depends on the flow field around the fuselage, which changes with speed, angle of attack and flap configuration. It therefore has to be measured for the type and tabulated as a correction against airspeed and configuration rather than applied as a single number.
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