1/2/2024 0 Comments Alsf 2![]() ![]() If the runway is observed to be clear and the lights are still illuminated, then the lights must be turned off and clearance re-issued. If a portion of the runway is not visible from the tower, ATC must visually scan the ASDE system. If a pilot or vehicle report indicates any portion of the RWSL system is on and is not able to accept an ATC clearance thenĪTC must visually scan the entire runway. RWSL is equipped with automatic intensity settings and must be operated on a continuous basis except under the following conditions: If controls are provided, turn the rotating beacon on:īetween sunrise and sunset when the reported ceiling or visibility is below basic VFR minima. If controls are provided, turn the lights on between sunset and sunrise. Requested by a pilot and no other known aircraft will be adversely affected.ĪC 150/5340-30, Design and Installation Details for Airport Visual Aides, contains recommended brightness levels for variable setting taxiway lights. As required by facility directives to meet local conditions.ĭifferent from subparagraphs a, b, or c above, when:.Between sunrise and sunset, turn the lights on as shown in subparagraphs a 1 and a 2 when the surface visibility is less than 2 miles.Until the aircraft has taxied off the landing runway. VFR aircraft-Before the aircraft enters the Class B, Class C, or Class D surface area, and IFR aircraft-Before the aircraft begins final approach, or Before an aircraft taxies onto the runway and until it leaves the Class B, Class C, or Class D surface area. Between sunset and sunrise, turn the lights on:.Operate the runway edge light system/s serving the runway/s in use as follows: Operate the SSALR system when the conditions in subparagraph a are not a factor. When the prevailing visibility is 3/ 4 mile or less or the RVR is 4,000 feet or less, operate the ALSF-2 system as follows:Īs you deem necessary if not contrary to pilot request.Unidentified Flying Object (UFO) ReportsįAA Order JO 7210.3, Para 10-6-2, Operation of Lights When Tower is Closed.Special Use, ATC-Assigned Airspace, and Stationary ALTRVs.Terminal Radar Service Area (TRSA) - Terminal.Basic Radar Service to VFR Aircraft - Terminal.Initial Separation of Departing and Arriving Aircraft.Initial Separation of Successive Departing Aircraft.Standard Terminal Automation Replacement System (STARS)-Terminal.Automatic Terminal Information Service Procedures.Therefore, seeing only to the roll bar by DA means missed approach-even though you can see 1,400 feet of approach light system ahead of you. Also, if you can’t see past the roll bar, you can’t see “the red terminating bars or the red side row bars” anyway. ![]() Few ILS approaches, and no LPV approaches, allow visibility that low without special equipment or authorization. If you reach a 200-foot DA and can’t see the roll bar that’s 1,000 feet short of the threshold, you have less than 1,800 feet of visibility. With only 2,400 feet of visibility, you probably won’t see a visual glidepath until the roll bar has passed under the nose. The PAPI or VASI is about 1,000 feet beyond the threshold, so fly attitude and resist any pitch changes. However, I’ll reiterate: Even though the ALSF-2 provides some roll and yaw information, it says nothing about glideslope. I wouldn’t quibble over 100 feet on the edge of legal. If you can only see to the 500-foot barrette, visibility is closer to 2,300 feet. Total length for the SSALR and MALSR, including the RAIL, is 2,400 feet. Otherwise, SSALRs and MALSRs are identical. The SS means a maximum brightness that’s higher than the M. The flashing lights still extend the full 1,400 feet, but because they’re all alone for much of that they get a new name: Runaway Alignment Indicator Lights, or RAIL. The outer section only has the solid white lights for 400 feet. The SSALR and MALSR have the inner section with no side rows and half the lights turned off (so they appear every 200 feet). Good weather, low budgets or inconveniently placed shopping malls off the approach end of the runway can mean parts of the ALSF-2 get turned off or never installed. Now that you have the big picture, use the accompanying chart as we cut it down. So, here’s more trivia: you could see the red termination bars or the red side-row bars, but never both. So where are the red terminating bars mentioned in FAR 91.175? They’re on an ALSF-1, which is the same length as an ALSF-2 but has a different inner section. ![]()
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