Definition
ILS 29 is the published Instrument Landing System approach procedure that guides an aircraft to Runway 29 at a given airport. The number 29 refers to the runway's magnetic heading, rounded to the nearest ten degrees (in this case, approximately 290°). The ILS itself provides precise lateral guidance (localizer) and vertical guidance (glideslope) to the runway threshold.
Plain English
An ILS 29 is the instrument approach that lines you up with Runway 29 and brings you down to the runway using radio signals for left-right and up-down guidance.
Context Anchor
Seen on avionics, GPS nearest-airport pages, approach lists, approach charts, and in instrument clearance discussions.
Derivation
“Instrument Landing System” means a landing guidance system used by reference to cockpit instruments. The number “29” is the runway designator, meaning the runway is aligned roughly with 290 degrees on the magnetic compass.
Why Pilots Care
Indicates an airport offers a precision approach option, improving safety and minimums for landing in instrument conditions.
Intuition Check
Do not read “29” as a version number or approach number. In “ILS 29,” it points to the runway: Runway 29.
Example Sentence 1
Center cleared us for the ILS 29 approach into the destination airport.
Example Sentence 2
We selected the airport with ILS 29 because the ceiling was below VFR limits.