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What is the correct read back to the following conditional clearance? "EC-ANB, behind the landing C172, line up runway 13 behind."
  • A
    Behind the landing C172, line up runway 13, EC-ANB.
  • B
    Line up runway 13, behind, EC-ANB.
  • C
    Behind the landing C172, line up runway 13 behind, EC-ANB.
  • D
    Line up runway 13, EC-ANB.

Refer to figure.
ICAO Doc 9432 - Manual of Radiotelephony
4.5 TAKE-OFF PROCEDURES

4.5.7 Conditional clearances shall not be used for movements affecting the active runway(s), except when the aircraft or vehicles concerned are seen by both the controller and pilot. When the conditional clearance involves a departing aircraft and an arriving aircraft, it is important that the departing aircraft correctly identifies the arriving aircraft on which the conditional clearance is based. Reference to the arriving aircraft type may be insufficient and it may be necessary to add a description of the colour or the company name to ensure correct identification. A conditional clearance shall be given as follows:

1) call sign;
2) the condition;
3) the clearance;
4) brief reiteration of the condition.

Example: “SAS 941, BEHIND DC9 ON SHORT FINAL, LINE UP BEHIND”.
Note: The term "behind" is used twice to avoid any possible confusion and make sure the pilot will line up and wait after the landing aircraft.

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