airbazar From United States of America, joined Sep 2003, 6952 posts, RR: 7 Posted (1 year 1 month 3 weeks 3 days 10 hours ago) and read 1608 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?
vikkyvik From United States of America, joined Jul 2003, 8313 posts, RR: 28 Reply 1, posted (1 year 1 month 3 weeks 3 days 9 hours ago) and read 1583 times:
AIRLINERS.NET CREW PHOTO SCREENER
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:
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.
mmedford From United States of America, joined Nov 2007, 536 posts, RR: 21 Reply 2, posted (1 year 1 month 3 weeks 3 days 4 hours ago) and read 1482 times:
rfields5421 From United States of America, joined Jul 2007, 6189 posts, RR: 25 Reply 3, posted (1 year 1 month 3 weeks 3 days 2 hours ago) and read 1448 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.
vikkyvik From United States of America, joined Jul 2003, 8313 posts, RR: 28 Reply 4, posted (1 year 1 month 3 weeks 2 days 22 hours ago) and read 1391 times:
airbazar From United States of America, joined Sep 2003, 6952 posts, RR: 7 Reply 5, posted (1 year 1 month 3 weeks 2 days 15 hours ago) and read 1325 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.
unattendedbag From United States of America, joined Oct 2003, 2241 posts, RR: 1 Reply 6, posted (1 year 1 month 3 weeks 2 days 15 hours ago) and read 1318 times:
Quoting airbazar (Reply 5): I did not know that 4L/22R do not have ILS.
mmedford From United States of America, joined Nov 2007, 536 posts, RR: 21 Reply 7, posted (1 year 1 month 3 weeks 2 days 11 hours ago) and read 1247 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
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