Instrument Landing System | Coverage

The localizer coverage sector extends from the transmitter to distances of:
• 25 NM (46.3 km) within plus or minus 10° from the centre line.
• 17 NM (31.5 km) between 10° and 35° from the centre line.
• 10 NM (18.5 km) outside ± 35° if coverage is provided.
These limits may be reduced to 18 NM within 10° sector and 10 NM within the remainder of the coverage when alternative navigational facilities provide satisfactory coverage within the intermediate approach area.

Localizer coverage
Localizer Coverage

Glide Path
The glide path coverage extends from the transmitter to a distance of at least:
10 NM (18.5 km) in sectors of 8° in azimuth on each side of the centre line.
The vertical coverage is provided from 0.45θ up to 1.75θ above the horizontal where θ is the promulgated glide path angle. The lower limit may be reduced to 0.3θ if required to safeguard the promulgated glide path intercept procedure.

Glide Path Horizontal Coverage
Glide Path Horizontal Coverage
Glide path vertical coverage

 Note: These are the sectors within which the ILS localizer and glide path emissions must provide correct indications. Radiated energy exists outside these vertical and horizontal sectors. 

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Behnam Bidar

Commercial Pilot Of I.R.I And The Civil Aviation Training Group Supervisor

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Instrument Landing System | Coverage

by Behnam Bidar time to read: 1 min