Definition
A revised ATC clearance issued to a pilot after the original clearance has been given, changing one or more elements such as route, altitude, speed, or destination. An amended clearance replaces the affected portion of the previous clearance and becomes effective the moment the pilot reads it back and ATC confirms.
Plain English
It is a change to the instructions ATC already gave you. Some part of your earlier clearance is being updated, and the new instruction takes the place of the old one.
Context Anchor
You will hear or read amended clearances during IFR operations when ATC needs to change your previously assigned route, altitude, or other instructions.
Derivation
From the Latin emendare, meaning 'to correct' or 'to free from fault.' An amendment is a correction or change to something already in place — here, a change to a clearance you have already received.
Why Pilots Care
You must comply with the new instructions immediately; continuing on the old clearance can create a conflict with traffic or airspace.
Intuition Check
Do not read amended clearance as a small suggestion or casual update. In ATC use, it is a changed authorization, and the latest clearance replaces the earlier instruction where they differ.
Example Sentence 1
Approach issued an amended clearance directing the flight to descend to 6,000 feet instead of the previously assigned 8,000.
Example Sentence 2
The pilot read back the amended clearance to confirm the new routing before proceeding.