airbazar From United States of America, joined Sep 2003, 9161 posts, RR: 10 Posted (3 years 2 months 1 week 3 days 10 hours ago) and read 2404 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?
airbazar From United States of America, joined Sep 2003, 9161 posts, RR: 10
Reply 5, posted (3 years 2 months 1 week 2 days 15 hours ago) and read 2121 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.
mmedford From United States of America, joined Nov 2007, 561 posts, RR: 8
Reply 7, posted (3 years 2 months 1 week 2 days 12 hours ago) and read 2043 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