Airfield Lighting specialise in AGL compliance in Australia by applying CASA's Manual of Standards Part 139 - Aerodromes (the MOS) and with ICAO Annex 14 internationally.

Airfield Lighting has developed Technical Specifications for High, Medium and Low Intensity systems that meet the requirements of the Regulations. A Brief Description of this follows :-

LIRL (Low Intensity Runway Lighting)

Most Australian airports and airfields are suitable for non-instrument runways or non-precision approach runways. These aerodromes do not provide personnel to adjust the intensity settings of the lights, such as an air traffic controller, certified air/ground operator, or similar. Most of these aerodromes use a Pilot Activated Lighting System (PAL) to turn the lighting system on.

MIRL (Medium Intensity Runway Lighting)

MIRL is a 3 stage intensity lighting system suitable for non-instrument runways or non-precision approach runways. This is provided to enhance the lighting system particularly in marginal weather conditions. This system can only be used at an aerodrome that has Air Traffic Control (ATC) services or similar personnel. Note: This requirement is for controlling light intensity during the landing phase. This is not to be confused with a lighting system controlled by a photo-electric cell which can provide Day, Twilight and Night intensity settings based on ambient conditions (Most Visual Approach Slope Indicator Systems eg: PAPI and T-VASI have this feature).

The three stage lighting system is set at 100%, 30% and 10% - available to air traffic controllers during Air Traffic Control (ATC) operating hours. Outside of ATC hours the system operates as a Low Intensity (LIRL) system only.

HIRL (High Intensity Runway Lighting)

HIRL is a 5 or 6 stage intensity lighting system which is suitable for precision approach runways that have Air Traffic Control (ATC) services or similar personnel responsible for adjusting the intensity of the lighting system.

There are two design layouts for HIRL systems CAT I and CAT II. The CAT III light system is the same as the CAT II design, but the serviceability of the light system is enhanced due to the lower Runway Visual Range (RVR).

The five RVRs are:

CAT I 1500 to 800 meters visibility

CAT II 800 to 400 meters visibility

CAT IIIA 400 to 200 meters visibility

CAT IIIB 200 to 50 meters visibility

CAT III C 50 to 0 meters visibility

Most major Australian airports have a CAT I system. Brisbane and Melbourne are the only CAT II systems in Australia. There are no CAT III systems in Australia.

Indira Gandhi International Airport (IGIA) New Delhi India, of which Airfield Lighting has been a major contributor and review to the new runway AGL design, will have three CAT IIIB runways, projected for commissioning by mid 2008.

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