Definition
A runway equipped with electronic and visual navigation aids that support an instrument approach procedure published for that runway, allowing pilots to land in reduced visibility conditions. Categories include non-precision instrument runways (lateral guidance only) and precision instrument runways (both lateral and vertical guidance, such as ILS).
Plain English
A runway set up with the equipment and approach procedures pilots need to land safely when they can't rely on seeing the runway clearly from far away.
Context Anchor
You will see this term in airport information, approach planning, and discussions of runway capability in poor visibility or low clouds.
Derivation
Instrument comes from a Latin word meaning a tool or means of doing something. In aviation, an instrument runway is not a runway with cockpit instruments on it; it is a runway that can be used with instrument-based guidance.
Why Pilots Care
It enables safe landings in low-visibility conditions, reducing weather delays and the risk of approach-and-landing accidents.
Intuition Check
Do not read “instrument runway” as a runway used only by instrument-rated pilots or a runway that physically contains instruments. Here it means the runway has approved guidance and published approach limits for instrument-based arrivals.
Example Sentence 1
With the cloud ceiling dropping, the pilot was glad the destination had an instrument runway with an ILS approach.
Example Sentence 2
Runway 27R is designated an instrument runway, so it has approach lighting and glide-slope guidance.