Definition
An IFR clearance delivered to the flight crew electronically — typically by datalink to the aircraft's printer or cockpit display, or via an airline's dispatch system — before pushback or taxi, in place of receiving the clearance verbally over the radio from Clearance Delivery.
Plain English
Your IFR clearance, sent to you in writing through a data system before you start moving, instead of being read to you over the radio.
Context Anchor
Pilots encounter PDC at participating airports before departure, often while still at the gate, ramp, or parking area.
Derivation
“Clearance” comes from “clear,” meaning free or allowed to proceed. In aviation, a clearance means official permission and instructions from air traffic control. “Pre departure” simply places that permission before the aircraft departs.
Why Pilots Care
Reduces voice-radio congestion, lowers the chance of read-back errors, and speeds up departure sequencing at busy airports.
Intuition Check
Clearance here does not mean physical space around the airplane. It means official permission and instructions from air traffic control.
Example Sentence 1
The captain reviewed the PDC printed at the gate and confirmed the assigned route and initial altitude before requesting pushback.
Example Sentence 2
After loading the PDC into the FMS, the crew verified the initial altitude and departure procedure matched the filed flight plan.