Definition
A training aircraft equipped with one communications radio and one navigation receiver, providing the minimum avionics needed for basic instrument flight instruction without the complexity or workload of multiple redundant systems.
Plain English
An aircraft that has just one radio for talking and one navigation receiver for finding its way, rather than several of each.
Context Anchor
Seen in instrument training when a pilot or instructor is discussing how the aircraft’s cockpit equipment is used for communication and navigation during a flight lesson.
Derivation
“Radio” comes from a word meaning “ray” or “beam,” referring to signals sent through the air. “Navigation” comes from older words connected with moving a ship or aircraft from one place to another. Together, the phrase points to equipment that uses radio signals to help the pilot communicate and find the way.
Why Pilots Care
Understanding this setup helps pilots confirm they can meet communication and navigation requirements without separate radios.
Intuition Check
Do not read “single” as meaning the aircraft can do only one thing at a time. Here it means one combined system is being used for both radio communication and navigation functions.
Example Sentence 1
The flight school uses a single radio and navigation system trainer for the first few instrument lessons before transitioning students to a more advanced aircraft.
Example Sentence 2
During the lesson the instructor demonstrated switching between communication and navigation modes on the single radio and navigation system.