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Boston (BOS) Centerfield Taxiway  
User currently offlineairbazar From United States of America, joined Sep 2003, 8363 posts, RR: 10
Posted (2 years 4 months 3 weeks 3 days 13 hours ago) and read 2061 times:

After much debate, Boston Logan's centerfield taxiway was finally built. But I've always wondered why it wasn't built exactly between the two runways (4/22 L&R). Does anyone know the reason why the centerfield taxiway was built much closer to runway 4L/22R?

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Photo © Urs Hess



7 replies: All unread, jump to last
 
User currently onlinevikkyvik From United States of America, joined Jul 2003, 10024 posts, RR: 26
Reply 1, posted (2 years 4 months 3 weeks 3 days 12 hours ago) and read 2036 times:
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If you look on Google Maps/Earth at the approach ends of 4R and 22L, you'll see that there are ILS hold points just off of the centerfield taxiway heading toward the runway:

http://maps.google.com/?ll=42.353073...009&spn=0.003088,0.005144&t=h&z=18
http://maps.google.com/?ll=42.376217...098&spn=0.003087,0.005144&t=h&z=18

That'd be my primary guess. You don't want that taxiway to be within the ILS clear zone (or whatever it's called), or you won't really be able to use it during instrument landings.

4L-22R has no ILS, so you can locate the taxiway closer to that runway.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlinemmedford From United States of America, joined Nov 2007, 561 posts, RR: 8
Reply 2, posted (2 years 4 months 3 weeks 3 days 7 hours ago) and read 1935 times:

Quoting vikkyvik (Reply 1):
ILS clear zone

ILS Critical Area...


*fill*

*fill*



ILS = It'll Land Somewhere
User currently offlinerfields5421 From United States of America, joined Jul 2007, 7607 posts, RR: 31
Reply 3, posted (2 years 4 months 3 weeks 3 days 5 hours ago) and read 1901 times:

You can clearly see in the picture above the ILS Critical Area markings - and the center taxiway is built as close to those as possible.

User currently onlinevikkyvik From United States of America, joined Jul 2003, 10024 posts, RR: 26
Reply 4, posted (2 years 4 months 3 weeks 3 days 1 hour ago) and read 1844 times:
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Quoting mmedford (Reply 2):
ILS Critical Area...

Thank you! Never remember stuff like that....



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineairbazar From United States of America, joined Sep 2003, 8363 posts, RR: 10
Reply 5, posted (2 years 4 months 3 weeks 2 days 18 hours ago) and read 1778 times:

Quoting vikkyvik (Reply 1):
4L-22R has no ILS, so you can locate the taxiway closer to that runway.

Thanks. I did not know that 4L/22R do not have ILS.
It's interesting however, that at the beninning of the 4's the centerfield taxiway is closer to 4R (and the ILS equipment), then is swerves left and away from 4R.

[Edited 2012-04-26 06:45:04]

User currently offlineunattendedbag From United States of America, joined Oct 2003, 2328 posts, RR: 1
Reply 6, posted (2 years 4 months 3 weeks 2 days 18 hours ago) and read 1771 times:

Quoting airbazar (Reply 5):
I did not know that 4L/22R do not have ILS.
http://www.airnav.com/airport/KBOS



Slower traffic, keep right
User currently offlinemmedford From United States of America, joined Nov 2007, 561 posts, RR: 8
Reply 7, posted (2 years 4 months 3 weeks 2 days 15 hours ago) and read 1700 times:

ILS Critical areas, iirc (not in work atm to look at the citing order), it's 35 Degrees from center of the mast (glideslope) or distribution box (localizer), and 1000 feet out. For our CATII/III sites, must be clear during CATII/III operations.

#1 reason, being reflections...also on a localizer, that's CAT II/III. We have what's known as a Far Field Monitor, which monitors the radiated signal. Unexplainable loss in signal can cause a downgrade in category. But i think the caveat with that, is if we enter CATIII & say we lose a transmitter (Our equipment is dual transmitter, with hot standby). We can still maintain CAT-III ILS, but if weather improves, we leave CAT-III and then weather degrades again...we are not allowed to re-enter CAT-III. Assuming no qualified technician is avaliable to look at the equipment.

The day in the life of an ILS Tech, has no equal...lol



ILS = It'll Land Somewhere
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