What is the purpose of clearance delivery procedures?

Clearance delivery procedures ensure pilots receive and correctly understand ATC route, departure, and runway clearances before taxi or departure.

When must a pilot read back a clearance?

A pilot must read back all ATC clearances, especially those involving runways, routes, headings, altitudes, and SSR codes.

What is a conditional clearance?

A conditional clearance becomes effective only when a specified condition, such as another aircraft passing, is met.

How should a pilot respond if a clearance is unclear?

The pilot should request clarification from ATC to ensure full understanding before acting.

What phraseology is used when a clearance is changed?

The word 'recleared' is used to indicate that a new clearance supersedes a previous one.

Clearance Delivery Procedures

Medium4 min readCommunications

Occasionally Examined

Why this matters

Clearance delivery procedures are vital for preventing misunderstandings that could lead to runway incursions, airspace conflicts, or loss of separation. Mastery of these procedures ensures clear communication and safe, efficient flight operations.

Clearance delivery procedures are the standardised steps and phraseology used by pilots and air traffic controllers to issue, receive, and confirm clearances before flight. These procedures ensure that all parties have a shared understanding of route, altitude, runway use, and any conditions attached to a clearance. Proper readback and acknowledgement are essential for safety and efficiency, especially in complex or busy airspace.

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Explanation

What is Clearance Delivery?

Clearance delivery is the process where pilots obtain their initial air traffic control (ATC) clearance, usually before taxiing. The dedicated 'DELIVERY' frequency is used at larger airports, while smaller aerodromes may combine this function with ground or tower control. The clearance typically includes route, initial altitude, squawk code, and any special instructions.

IFR Clearance Procedure

When requesting an IFR clearance, the pilot states their call sign and request. ATC responds with the clearance, which the pilot must read back in full. This readback confirms the pilot has correctly received and understood the clearance. Items requiring full readback include:

Route clearances
Runway assignments
Altitudes and headings
Squawk (SSR) codes
Conditional clearances (e.g., "after landing traffic passes, line up and wait")

Clearance Readback Requirements

All clearances related to runway use (enter, cross, take off, hold short, etc.) must be read back entirely. Other instructions may be acknowledged with a shorter response, but always include the aircraft call sign at the end.

Conditional Clearances

A conditional clearance is only valid once a specified event occurs, such as "after the landing 737 passes, cross runway 27." Both the pilot and controller must be able to visually identify the referenced traffic. The standard phraseology sequence is: call sign, condition, clearance, and a brief restatement of the condition.

CPDLC and Voice Procedures

If a controller-pilot data link communication (CPDLC) message needs correction, or if reverting from CPDLC to voice, standard phrases like "disregard last CPDLC clearance, standby for voice instructions" are used. In case of CPDLC failure, pilots must promptly establish voice contact and clarify their clearance status.

Distress Procedures

During a distress or urgency situation, discrete frequencies may be used. All other stations must maintain radio silence and not interfere until the emergency is resolved or ATC advises otherwise.

The essentials

Key Points

Clearance delivery is used to issue initial ATC clearances before departure.

Full readback is mandatory for route, runway, altitude, and squawk code clearances.

Conditional clearances depend on a specific event, such as another aircraft's movement.

The correct sequence for conditional clearances is: call sign, condition, clearance, restate condition.

Pilots must clarify any unclear clearance or condition before acting.

CPDLC failures require prompt switch to voice and clear communication.

During distress, all other stations must maintain radio silence on the frequency.

Watch out

Exam Traps & Typical Mistakes

Confusing the order of elements in a conditional clearance (call sign, condition, clearance).

Forgetting to read back runway-related clearances in full.

Assuming a simple acknowledgment is enough for route or runway clearances.

Not including the aircraft call sign at the end of a readback.

Believing conditional clearances can be used without visual confirmation of the referenced traffic.

Test yourself

Example Exam Questions

Question 2Medium

What is the correct sequence for issuing a conditional clearance?

Question 3Medium

Which of the following clearances must always be read back in full?

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