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rjsampson
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San Diego (SAN) Runway touchdown zone lights on 27

Thu Nov 19, 2020 2:21 am

The approach to runway 27 is non-precision (LOC only). However, is touchdown zone lighting. I thought you'd only find this lighting on precision approaches. Is that correct? If so, why does 27 have such lighting?
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GalaxyFlyer
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Thu Nov 19, 2020 3:06 am

I’m guessing the long threshold displacement probably required putting the TDZ lights in to emphasize where the TDZ is. None of this is as hard and fast as some think, the AIM talks about “some precision runways” having TDZ lighting. It depends is always a good answer.
 
CosmicCruiser
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Thu Nov 19, 2020 2:01 pm

Didn't 27 originally have an ILS until the parking garage was built?
 
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rjsampson
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Thu Nov 19, 2020 5:32 pm

CosmicCruiser wrote:
Didn't 27 originally have an ILS until the parking garage was built?


No, 27 never had an ILS. The terrain has always prevented that from being implemented. Incidentally, the parking garage has less effect on the steeper glidepath than the terrain itself.
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N1120A
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Fri Nov 27, 2020 10:01 am

There's a pretty simple reason - it is a major airport and they want to assure the safest possible operation. KSAN uses a MALS on 27 and MALSR on 9. They also have runway status indicators for added safety.

Runway 20 at KMSY also has a MALSR and no ILS, while runway 2 has an ILS but only RLLS. Runway 31 at KBTR has only an RNAV (GPS) approach and has MALS. Runway 22 at KHOU is LOC only and has MALS. 2 of those are very busy airports that have regular operations to those runways. KBTR gets a decent number of air carriers and plenty of GA.

Conversely, there are airports with ILS installations that do not have any sort of precision approach associated lighting system leading into the runway.
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IAHFLYR
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Fri Nov 27, 2020 3:16 pm

N1120A wrote:
2 of those are very busy airports that have regular operations to those runways. KBTR gets a decent number of air carriers and plenty of GA.


KHOU Rwy 22 actually does not get very many arrivals unless the wind is howling from the southwest and then a reduce arrival rate due to the final controller airspace is fairly short leaving not much of a downwind (maybe 10 NM) due to the proximity of IAH 26L/R and 27 airspace. But you are correct MALS are there with a LOC approach.
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N1120A
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Re: San Diego (SAN) Runway touchdown zone lights on 27

Fri Nov 27, 2020 10:56 pm

IAHFLYR wrote:
N1120A wrote:
2 of those are very busy airports that have regular operations to those runways. KBTR gets a decent number of air carriers and plenty of GA.


KHOU Rwy 22 actually does not get very many arrivals unless the wind is howling from the southwest and then a reduce arrival rate due to the final controller airspace is fairly short leaving not much of a downwind (maybe 10 NM) due to the proximity of IAH 26L/R and 27 airspace. But you are correct MALS are there with a LOC approach.


Yeah, I wasn't really talking about the number of operations, though that still kinda makes the point. Lighting systems associated with precision approaches are installed on runways without precision approaches, particularly at major airports.
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