When will number 2 acknowledge receipt of clearance from clearance delivery?

The correct response is that number 2 acknowledges receipt of clearance only after clearance delivery calls "read back correct." This ensures that the communication process is clear and confirmed. Acknowledging only after the clearance is validated by clearance delivery minimizes the potential for miscommunication, thereby enhancing safety. Once clearance delivery confirms that the readback is correct, number 2 can respond appropriately, confirming that they have received and understood the clearance.

In scenarios where immediate acknowledgment or responses are expected without validation can create confusion. Similarly, waiting a set period or waiting for another pilot to confirm clearance before acknowledgment does not align with standard communication protocols in aviation, which emphasize clarity and precision.