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Considering a flight director of the command bars type:

1 – the vertical bar is always associated with the roll channel
2 – the vertical bar may be associated with the pitch channel
3 – the horizontal bar may be associated with the roll channel
4 – the horizontal bar is always associated with the pitch channel.

The combination that regroups all of the correct statements is:

  • A
    1, 3, 4.
  • B
    1, 2, 4.
  • C
    1, 4.
  • D
    1, 2, 3, 4.
The flight directors provide information for the pilot to join a desired path with the optimum attitude. Flight director information supplied by an FD computer is presented in the form of command bars on the Attitude Director Indicator (ADI).

The vertical command bar of the FD supplies information about the direction and magnitude of the corrections to be applied to the bank angle of the aircraft. The vertical bar is always associated with the roll channel.

The horizontal command bar of the FD supplies information about the direction and magnitude of the corrections to be applied to the pitch angle of the aircraft. The horizontal bar is always associated with the pitch channel.

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