Air Traffic Control Clearance
An air traffic control clearance is an authorization issued by an ATC unit for an aircraft to proceed under specified conditions within controlled airspace. A clearance is not a command — it does not relieve the pilot-in-command of responsibility for the safe operation of the aircraft. The PIC remains responsible for terrain clearance, see-and-avoid in VMC, and regulatory compliance.
Components of an IFR Clearance
- Aircraft identification: Your callsign
- Clearance limit: The fix or point to which the clearance applies
- Route: Airways, direct routing, or specific fixes
- Altitude: Assigned altitude or altitude restrictions
- Additional instructions: Departure procedures, frequency changes, transponder codes
Readback Requirement
CARs and ICAO standards require pilots to read back all ATC clearances and instructions. Altitude assignments, headings, runway assignments, and hold-short instructions must always be read back verbatim. The controller must verify the readback and correct any errors.
On the TC Written Exam
Know that a clearance is an authorization, not a guarantee of separation from non-participating VFR traffic. In VMC, the PIC retains see-and-avoid responsibility even under an IFR clearance.
Related Terms
See also: ATC Instruction, Clearance Limit, Readback.