10.0 Clearances and Instructions

10.01 An ATC instruction

(1) must be complied with when received by the pilot providing the safety of the aircraft is not jeopardized.

(2) must be "read back" in full to the controller and confirmed before becoming effective.

(3) is in effect advice provided by ATC and does not require acceptance or formal acknowledgement by the pilot concerned.

(4) is the same as an ATC clearance.

10.02 An ATC clearance

(1) is the same as an ATC instruction.

(2) is in effect advice provided by ATC and does not require acceptance or acknowledgement by the PIC.

(3) requires compliance when accepted by the PIC.

(4) must be complied with when received by the PIC.

10.03 A pilot, after accepting a clearance and subsequently finding that all or part of the clearance cannot be complied with, should

(1) disregard the clearance.

(2) comply with only the part that is suitable.

(3) comply as best as possible under the circumstances to carry out the clearance and need not say anything to ATC.

(4) comply as best as possible under the circumstances and advise ATC as soon as possible.

10.04 After accepting a clearance and subsequently finding that it cannot be complied with, a pilot should

(1) take any immediate action required and advise ATC as soon as possible.

(2) comply as best as possible under the circumstances and say nothing to ATC.

(3) disregard the clearance.

(4) comply with the suitable parts.

10.05 An ATC clearance or instruction is predicated on known traffic only. Therefore, when a pilot is proceeding in accordance with a clearance or instruction

(1) ATC is relieved of the responsibility for traffic separation.

(2) the responsibility for traffic separation is divided between ATC and the pilot.

(3) the pilot is not relieved of the responsibility for traffic avoidance.

(4) the pilot is relieved of the responsibility for traffic avoidance.

10.06 If all or part of an ATC clearance is unacceptable, a pilot should

(1) comply as best as possible under the circumstances.

(2) refuse the clearance without giving a reason for refusal.

(3) acknowledge the clearance and read back only the acceptable parts.

(4) refuse the clearance and inform ATC of the pilots intentions.
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This page written 8 October 2002 by Robyn Stewart. Last revised 8 October 2002.

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