What does EFC stand for in aviation communications?

• A. Emergency Frequency Channel
• B. Enhanced Flight Clearance
• C. Expect-Further-Clearance
• D. Equalized Flight Control

Answer: (C)

In aviation communications, the phrase we’re looking for is used when a controller can’t give the full next clearance right away and wants the pilot to anticipate it. Expect-Further-Clearance means the pilot should be ready for another clearance to be issued at a specified time or at a certain point, rather than assuming everything is settled with the current clearance. This helps manage traffic and keeps separation without interrupting the flow with a full new clearance immediately.

That’s why this option is the best: it exactly matches the standard wording used in air traffic control to indicate that additional clearance will follow. The other terms aren’t standard phraseology in this context—emergency frequency channel, enhanced flight clearance, and equalized flight control are not used to convey the intended ATC instruction.