ILS Critical Area signage: Localizer or Glideslope?

[Adam K.]

Hi,

Does the ILS Critical Area sign apply to the localizer or the
glideslope antenna? Or is this is a dumb question?

CCR (Concord California) 19R has a localizer approach. No glideslope.
It has an ILS Critical Area sign. I read recently that ILS
equipped fields require the ILS critical area sign for the ground
based Glideslope antenna. Apparently, a portion of the glideslope
signal is bounced onto the ground, thus the requirement of not parking
a vehicle in that area.

AK (with too much taxi time)

[Steven P. McNicoll]

"Adam K." > wrote in message
om...
>
> Does the ILS Critical Area sign apply to the localizer or the
> glideslope antenna?
>

It can be either.

[Phoenix Pilot]

Ok, since we're on the subject I have a question regarding this.

We are all familiar with the ILS Critical Area signage on the
taxiways, requiring you to hold short of that line to keep from
interfering with the ILS signals (glideslope or localizer).

I have always been under the impression that when you see those lines
you don't cross until your given permission too (cleared onto the
runway, etc.) However I'm currently working on my CFII right now, and
my flight instructor the other day told me that those areas are not
always active and you don't always have to hold short of them. He
wasn't real clear on where or how you'd find out when the area was
"hot" or not, which leads me to question whether that is true or not.

Anyone know a defintive answer on this?

[Robert Moore]

(Phoenix Pilot) wrote
> Anyone know a defintive answer on this?

First hit on a Google search...........

ILS Critical Area Hold Position Sign and Pavement Markings Hold when
instructed by ATC. Effective when instrument approaches are being
conducted with visibility less than or equal to 2 miles, and/or,
ceilings are less than or equal to 800 feet.


Bob Moore

[Garner Miller]

In article >, Phoenix
Pilot > wrote:

> I have always been under the impression that when you see those lines
> you don't cross until your given permission too (cleared onto the
> runway, etc.) However I'm currently working on my CFII right now, and
> my flight instructor the other day told me that those areas are not
> always active and you don't always have to hold short of them.

Your CFI is right. It's the controller's job to protect the critical
area if the weather is low enough (under 800 & 2) to warrant it. If
you need to remain clear of the critical area, the tower will instruct
you to do so. Absent any instruction to remain clear of the critical
area, you're expected to go all the way to the hold short line.

A quick search yielded, among other things, this document:

http://www.rduafss.faa.gov/navaids/ils.htm

Section K has the details on the critical area.

--
Garner R. Miller
ATP/CFII/MEI
Manchester, CT =USA=