An air traffic control instruction

• A. Is the same as an ATC clearance
• B. Must be compiled with when received by the pilot unless he/she considers it unsafe to do
• C. Must be read back in full to the controller and confirmed before becoming effective
• D. Is advice provided by ATC and does not require acceptance or acknowledgement by the pilot

Answer: (B)

An ATC instruction is a binding directive from air traffic control that pilots must follow. It guides how you fly to maintain safety and orderly flow, and you are expected to comply unless you believe continuing would be unsafe or impractical. If you think something in the instruction isn’t safe, you should inform ATC and request clarification or an alternative, but that doesn’t make the instruction optional—the issue is about safety and communication, not choice.

This is more than casual advice, and it isn’t simply the same as a clearance. Clearances authorize specific actions, while instructions can impose heading changes, altitude restrictions, speed changes, or procedural requirements to manage traffic. Reading back is a useful safety practice to confirm important parts of a directive, but it isn’t universal for every instruction before it becomes effective, and ATC expects you to comply and acknowledge appropriately.