How do wind directions necessitate both northern and southern runway ILS?

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Wind Patterns Require Dual Runway Instrument Landing Systems at Seletar Airport

Singapore's Ministry of Transport has stated that Seletar Airport requires Instrument Landing System (ILS) procedures for both its southern and northern runways due to prevailing wind patterns in the region. Aircraft operations, specifically landing and taking off, are critically dependent on favourable wind conditions, necessitating approaches that align with the wind direction. The regional climate dictates that winds blow from a north-easterly direction for approximately six months of the year and from a south-westerly direction for the remaining six months.
Seasonal Wind Shifts Mandate Bi-directional Approaches

The necessity for both northern and southern approach procedures stems directly from the seasonal shifts in wind direction. For half of the year, the prevailing winds favour operations from the northeast, requiring a specific set of flight procedures for aircraft approaching the airport from the north. Conversely, during the other half of the year, winds predominantly blow from the southwest, making it essential to have complementary flight procedures for aircraft approaching from the south.
Inadequacy of a Single Approach Procedure

Consequently, flight procedures designed solely for a southerly approach cannot adequately or safely substitute for all procedures required for a northerly approach, and vice versa. This is because the safety and efficiency of an aircraft's landing and takeoff are directly linked to its ability to face into the wind. Relying on a single set of procedures would compromise operational safety during periods when the wind direction is not conducive to that specific approach.
Implementation of Dual ILS Procedures

Singapore's Civil Aviation Authority (CAAS) has communicated to the Civil Aviation Authority of Malaysia (CAAM) that in addition to the existing ILS procedures for the northerly approaches into Seletar Airport, CAAS will be implementing instrument flight procedures for the southerly approaches. This dual implementation ensures that Seletar Airport can maintain safe and efficient operations throughout the year, regardless of the prevailing seasonal wind direction.

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How do wind directions necessitate both northern and southern runway ILS?

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