Which of the following is NOT part of the THREE C's?

The THREE C's are a fundamental concept in aviation used to ensure pilots remain aware of their aircraft's status and the surrounding environment during flight operations. They are:

1. Configuration - refers to the setup of the aircraft, including how systems are configured for specific phases of flight (like landing or takeoff).

2. Checklist - involves using checklists to confirm the aircraft is set up correctly and that all necessary precautions and procedures are followed before and during flight.

3. Clear area - emphasizes the importance of ensuring the surrounding area is safe and free from obstacles, other aircraft, or hazards.

Given this understanding, the option labeled "Communication" is not part of the THREE C's framework. While communication is indeed vital in aviation, especially for ensuring safety and coordination among crew members and air traffic control, it does not fit within the specific framework of the THREE C's list. This distinction is crucial for pilots, as it helps them focus on the immediate technical requirements and safety protocols that are outlined in the THREE C's, while communication, although essential, is treated separately in operational procedures and teamwork concepts in aviation.