Page 215 - 인천국제공항 4단계 건설사업 건설지 [화보집 영문]

Ensuring safe landings:
establishing instrument landing system for
Runway 4
The Instrument Landing System (ILS) is a wireless marking
to instruct aircraft of their vertical/horizontal location and
distance to the landing point, making sure aircraft land safely

in any weather conditions. ILS is composed of a localizer,
glide path, inner markers, middle markers, and outer markers.
It was required to satisfy all legal criteria before operations.
CAT-III was mandatory for normal operations of Runway 4.

It means that it should be possible to takeoffs and landings
in the southern and northern part of the runway even in low
visibility of 75 meters. The issue was frequency interference
from the aircraft on the taxiway of Runway 4.

To address the issue, an investigation of the external
electromagnetic environment was conducted to identify signal
blind spots. Precise adjustments to the equipment were made,
normalizing azimuth SDM signals. Additionally, abnormal

signals from the glide slope equipment were resolved through
antenna calibration. As a result, Runway 4 passed the ILS
CAT-III flight test in March 2021 and the flight test for the
flight lighting facility in April. On June 17, 2021, the operation

of Runway 4 successfully started.

212 PART.4 | Achieving the 100-million-passenger era | Phase 4 construction project 213