Definition
In a training syllabus, IR is a notation indicating that a maneuver or procedure is to be performed by reference to the flight instruments rather than by outside visual cues. It is commonly paired with VR (visual references) to specify how a given training task should be flown.
Plain English
A shorthand used in training syllabi meaning the student flies the maneuver by looking at the cockpit instruments instead of looking outside.
Context Anchor
Seen in flight training syllabi when a lesson or maneuver is practiced using the aircraft instruments as the main guide.
Derivation
Instrument comes from a Latin word meaning a tool or something used to prepare or carry out a task. Reference comes from a Latin word meaning to carry back or relate something to a point. Together, instrument references are the tools the pilot looks back to for guidance.
Why Pilots Care
Using instrument references correctly prevents disorientation and allows continued safe flight when visibility is lost.
Grounding Statement
If the outside view does not clearly show what the airplane is doing, instrument references give the pilot a reliable place to look for control information.
Intuition Check
Do not read references here as books or written sources. In this context, references are the cockpit instruments the pilot uses as visual guides.
Example Sentence 1
The syllabus marks steep turns as IR, so the student performs them while looking only at the attitude indicator, altimeter, and airspeed indicator.
Example Sentence 2
After entering the cloud layer, the pilot shifted focus entirely to instrument references.