What must a pilot do in response to an IFR clearance issued by ATC?

When a pilot receives an IFR clearance from Air Traffic Control (ATC), it is essential to read back the altitude assignments or vectors. This confirmation ensures that both the pilot and ATC have a mutual understanding of the clearance and helps to mitigate any misunderstandings that could jeopardize flight safety. The readback includes important information such as the assigned altitude and any vectors given, which are crucial for maintaining safe separation from other aircraft and adhering to the specified air traffic control procedures.

Confirmation of these details is not only a procedural step but also a best practice that enhances communication between the pilot and ATC. This readback requirement is embedded in regulations to maintain situational awareness and safety within controlled airspace. Moreover, ATC is looking for readiness and compliance from the pilot, which is signaled through this readback.

While confirming that the intent is to fly VFR, filing a flight plan, or requesting a change in route are actions that may occur in different contexts, they are not specific requirements immediately following the issuance of an IFR clearance. The readback is the direct and necessary response to ensure that the pilot is following the IFR procedures as directed by ATC.