The Medium Intensity Approach Lighting System with Sequenced Flashing Lights (MALSF) system consists of seven barrettes of variable-intensity lights spaced 60 metres apart, commencing 60 metres from the threshold, over a distance of 420 metres. In a MALSF, the three barrettes farthest away from the threshold contain a sequenced flashing light unit. These lights flash sequentially towards the threshold, repeating at two cycles per second.

**Medium Intensity Approach Lighting System with Sequenced Flashing Lights** (**MALSF**)
_{^{Transport Canada – Aeronautical Information Manual}}

References

AIM AGA 7.5.1 Non-Precision Approach Runways

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