What visibility level triggers low visibility procedures at airports?

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Low Visibility Procedures Triggered Below 400 Metres Horizontal Visibility

Airports will implement low visibility operating procedures exclusively when horizontal visibility falls below 400 metres. This critical threshold is determined by meteorological equipment that measures horizontal visibility, a metric known in aviation as runway visual range (RVR). Should the horizontal visibility drop below this 400-metre mark, the airport authority, upon the recommendation of Air Traffic Control, reserves the right to suspend airside operations.
Measurement of Visibility

Visibility is quantitatively assessed using specialized meteorology equipment situated at each end of the runway. This equipment specifically measures horizontal visibility, which is referred to within the aviation industry as Runway Visual Range (RVR). The RVR provides a precise indication of how far a pilot can see along the runway.
Decision to Suspend Operations

The decision to halt airside operations rests with the airport authority and is contingent upon advice from Air Traffic Control. This measure is enacted when the measured horizontal visibility, or RVR, descends below the 400-metre benchmark. Such a suspension is a safety protocol designed to mitigate risks associated with diminished visual cues for aircraft operations.
Historical Precedent of Haze Impact

A notable instance where low visibility impacted airport operations occurred in October 2015 at Langkawi International Airport. The airport experienced a temporary closure lasting over three hours due to haze, which reduced visibility to 500 metres. This event led to hundreds of passengers being stranded at the terminal.
Advanced Airport Systems

Airports in Malaysia are equipped with sophisticated systems designed to facilitate aircraft landings even in hazy conditions. These modern technologies include the Instrument Landing System (ILS) and the Surface Movement Radar System (SMR), which provide enhanced guidance and surveillance capabilities for air traffic management.

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What visibility level triggers low visibility procedures at airports?

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