|
|
| Re: Crew tried to abort landing before San Francisco air crash (1080009) | |||
 |
|||
| Home > OTChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: Crew tried to abort landing before San Francisco air crash |
|
|
Posted by Dave on Sun Jul 7 22:44:45 2013, in response to Re: Crew tried to abort landing before San Francisco air crash, posted by SelkirkTMO on Sun Jul 7 21:40:43 2013. Runway 19L has MALSF, a medium intensity approach lighting system with sequenced flashers. The MALSF system usually is a 1400-foot-long array of lights but can be longer or shorter depending on local terrain and requirements.A typical MALSF system consists of the following light fixture components: a) 9 light bars each with 5 steady burning white PAR38 fixtures b) 5 sequence flashing white PAR56 fixtures c) Threshold bar of 18 steady burning green PAR56 fixtures. It looks like this:  The MALSF on 19L is non-standard, having a length of 1,115 feet with 3 sequenced flashers. Runway 28R uses ALSF2. It provides visual information on runway alignment, height perception, roll guidance, and horizontal references for Category II/III instrument approaches. ALS are a configuration of signal lights starting at the landing threshold and extending into the approach area a distance of 2400 feet for precision instrument runways. A typical ALSF-2 system (High Intensity Approach Lighting System With Sequenced Flashing Lights) consists of 247 steady burning lights: including green threshold lights (49 lights), red side row-bar lamps (9 rows, 54 lamps), and high intensity steady burning white lights (144), plus an additional 15 flashing lights commonly referred to as strobes. The strobes flash in sequence starting with the strobe farthest from the runway and ending with the strobe closest to the runway threshold. The lights are spaced at 100' intervals from the runway threshold outward to 2400'. It looks like this:  |
|
|
|