Definition
A general category of precision approach guidance systems that use electronic signals to provide pilots with lateral and vertical course information for landing. This includes the traditional Instrument Landing System (ILS) using ground-based radio transmitters, as well as satellite- and computer-based equivalents such as the Wide Area Augmentation System (WAAS) and Localizer Performance with Vertical Guidance (LPV) approaches.
Plain English
Electronic systems that send signals to the aircraft so the pilot can line up with the runway and descend at the correct angle to land, even when visibility is poor.
Context Anchor
Seen in instrument approach and head-up display discussions, where landing guidance may be shown directly in the pilot’s forward view.
Derivation
‘Electronic’ signals the use of radio or digital signal sources rather than purely visual references. ‘Instrument landing’ means the pilot is flying primarily by reference to cockpit instruments rather than by looking outside.
Why Pilots Care
These systems enable safe, precise landings in low-visibility conditions that would otherwise require a missed approach or diversion.
Grounding Statement
Picture the system as an electronic path leading to the runway that the aircraft can follow when the runway is not easy to see.
Intuition Check
Do not read this as any electronic instrument used during landing. Here it means a landing guidance system that provides a path to the runway.
Example Sentence 1
The HUD displays guidance cues from the aircraft's electronic instrument landing systems, allowing the pilot to fly a precise approach in reduced visibility.
Example Sentence 2
Electronic instrument landing systems provided both localizer and glideslope information that the HUD overlaid directly on the pilot's forward view.