Alsf 21/16/2024 ![]() ![]() If you see any of those parts, AND you’re in a position for normal approach and landing, AND the flight visibility is at or above approach minimums, then you can continue your approach and landing visually as long as you keep those things in sight. ![]() The threshold (itself, the markings, or lights) The touchdown zone (itself, the markings, or lights) The runway (itself, the markings, or lights) Runway end identifier lights (REIL, the flashing strobes on either side of the threshold) If you can’t see those terminating or side row bars you’d have to maintain that 100′ altitude above TDZE until or unless you can see any other part of the runway environment. This applies whether it’s ALSF 1 or 2 because those numbers only refer to different layouts of the lights. The regulation 91.175, which I take it you’re talking about, says that if you see those lights of the ALS you’re allowed to descend to 100′ above the TDZE “unless the red terminating bars or the red side row bars are also distinctly visible and identifiable”, in which case you’d be allowed to continue the descent to landing. The approach lighting system (ALS) is the set of light bars and/or moving strobes out ahead of the runway. I also looked up FAA order on ALS and it says it is not really required for CAT-ll and CAT-lll approaches and unfortunately does not state anything on ALSF-I. Reg clearly states 'one of the visual reference' for intended landing runway including red bars but they are not the runway I am intending to land. Now my question is, you see the red terminating bars/ side row bards and descend to whatever the altitude but you do not see the runway, should I continue descending or go around? So I did the internet research and found out they are only seen when the runway is equipped with either I or II version, and we are allowed to descend below 100ft above TDZE but no other types of ALS, if I am correct. I was going through the regulation part which was bit vague in meaning but I grew to digging into ALSF-I and II when I read the text saying 'red terminating bar/ side row bar. I am currently working on my instrument, and I will be soon doing my check ride with DE next week. See ADB Safegate PAR-56 data sheet 1042 for more details.Asked by: Mae 5547 views FAA Regulations, Flight Instructor, Instrument Rating Note: Steady-burning portion of ALSF system is ordered separately. Flashing lights are arranged and connected in such a way as to produce a sequenced flashing light signal that has the appearance of a ball of light traveling down the system from the outer end (flasher farthest from the runway threshold) to the flasher assembly closest to the runway threshold. Up to 21 flashing lamp assemblies are installed in the outer portion of the approach lighting system at regular intervals. In the ALSF configuration, an array of light bars are installed symmetrically around the centerline of the approach lighting system, starting at the approach threshold and extending a total distance of 2,400 feet (731.5 m) outward into the approach zone up to 3,000 feet (914 m) at facilities where high-speed military aircraft share runway usage. Theory of Operation ADB Safegate's sequenced-flasher lighting systems include a master control unit, junction boxes, individual control cabinets (ICC), and elevated flasher units. The SSALR approach lighting system has up to eight sequenced flashing lights and is used as part of a dual-mode approach lighting system (ALSF-2/SSALR) when Category I conditions exist on Category II designated runways.The ALSF-2 approach lighting system is used on Category II runways and includes up to 30 light stations (100-foot spacing) with 30 centerline bars of steady-burning lights (five lights to a bar) and up to 21 flashers.The ALSF-1 approach lighting system is used on Category I Instrument Landing Systems (ILS) and includes up to 24 light stations (100-foot spacing) with up to 22 centerline bars of steadyburning lights (five lights to a bar) and up to 15 flashers.APPROACH LIGHTINGALSF High-Intensity Approach Lighting System WITH ELEVATED SEQUENCED FLASHERSCompliance with Standards FAA: Designed according to ALSF-1, ALSF-2, ALSF-2/SSALR Applications Uses ALSF-1, ALSF-2, and ALSF-2/SSALR approach lighting systems with elevated sequenced flashing lights are used at airports and military air bases to provide landing approach guidance, such as runway alignment, height perception, horizontal reference, and roll guidance extending from the landing threshold outward (2,400-3,000 feet) into the approach zone. ![]()
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