![]() ![]() THRE can be up to 20 feet lower than the permitted TDZE value, so instead of 100 feet, using the THRE value would put the aircraft at 80 feet above the TDZE. Technically, TDZE is not known to the pilot if THRE is printed on the chart, so there is no way on these approaches to satisfy 91.175 (c)(3)(i). This was done for international harmonization and is now recognized as an error. Several different configurations are available: ALSF I (Approach Lighting System with Sequenced Flashing Lights) is used on Category I runways during instrument landing approach to align the aircraft with the centerline of the runway and to establish vertical orientation. The MALSR, is the same as the MALS except it has the RAIL extending the system by 5 to 7 additional sequenced flashing lights each separated by 200 feet from the light(s) in front of them for a total length of at least 2400 feet.ĩ1.175 (c)(3)(i) states:”The approach light system, except that the pilot may not descend below 100 feet above the touchdown zone elevation using the approach lights as a reference unless the red terminating bars or the red side row bars are also distinctly visible and identifiable.” Strobes are not mentioned and the 100 feet reference is above the TDZE and not AGL.Īs a side point, about 4000 approaches don’t have TDZE printed on the approach chart, but have THRE which is the Threshold Elevation. Approach lighting systems provide landing approach guidance for pilots. ![]() The MALSF is the same layout and length as the MALS except that the last three 5 light bars also have sequenced flashing strobes. I would think that a NOTAM indicating the failure of any component of the approach light system would require that the 1/4 SM penalty would be applicable.Ī MALS system has 7 rows of 5 light bars separated by 200 feet, with two additional 5 light bars on either side of the 1000 foot bar segment with a total length of 1400 feet. ![]()
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