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| Re: Crew tried to abort landing before San Francisco air crash (1079950) | |||
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Re: Crew tried to abort landing before San Francisco air crash |
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Posted by Dave on Sun Jul 7 21:18:31 2013, in response to Re: Crew tried to abort landing before San Francisco air crash, posted by SelkirkTMO on Sun Jul 7 19:46:54 2013. You don't need the ILS for an IFR approach and landing, either. There are alternatives with higher landing minimums (ceiling and visibility) like a Localizer or VOR approach.The lights you're referring to are the visual slope indicator lights. There are different variations; Runway 28L at KSFO has a 4-light precision approach path indicator (PAPI) system. PAPI uses light units installed in a single row of either two or four light units. These lights are visible from about 5 miles during the day and up to 20 miles at night. The visual glide path of the PAPI typically provides safe obstruction clearance within plus or minus 10 degrees of the extended runway centerline and to 4 SM from the runway threshold. Descent, using the PAPI, should not be initiated until the aircraft is visually aligned with the runway. The row of light units is normally installed on the left side of the runway and the glide path indications are as depicted. Lateral course guidance is provided by the runway or runway lights. In certain circumstances, the safe obstruction clearance area may be reduced due to local limitations, or the PAPI may be offset from the extended runway centerline. It looks like this: 
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