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Arrange the path of data to a primary flight display in order:

1. Air data and inertial sensors measure the aircraft state

2. Data is placed on the avionics bus

3. The symbol generator builds the display picture

4. The picture is written to the display unit

5. The crew reads attitude, speed and altitude

Select the correct sequence.

  • A.1, 3, 2, 4, 5
  • B.1, 2, 4, 3, 5
  • C.1, 2, 3, 4, 5
  • D.2, 1, 3, 4, 5

Answer: C

Each stage adds latency, and the total is what determines whether the attitude presentation feels immediate to the pilot. Excessive lag invites pilot induced oscillation, which is why the budget is controlled throughout.

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