ILS critical area when the tower is closed?

Mark Hansen wrote:

On 11/20/2005 6:02 PM, wrote:

Mark Hansen wrote:



Where is this defined?


It's defined by the sign and some common sense.


Which common sense is that, Tim? How would a VFR departure know
that there might be another airplane on a 10 mile final using the ILS
system at a non-towered field?

A tower won't instruct you to hold short of the ILS critical areas with
an aircraft on a 10 mile final.

If you can see an aircraft on approach (or hopefully are clued in by his
CTAF reports) if he is close enough that you decide you need to hold
short, then the common sense decision would be to hold short of the ILS
critical area signs.

It's the conservative and safest option. And, it's what the FAA airport
folks hope you will do.

Mark Hansen wrote:
In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

The reason you're supposed to keep clear of the ILS critical area is
because your airplane can affect the glide slope beam. The presence or
absence of somebody in the tower doesn't change the physics of how
microwaves interact with metallic bodies.

On 11/20/2005 12:55 PM, Roy Smith wrote:

Mark Hansen wrote:
In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

The reason you're supposed to keep clear of the ILS critical area is
because your airplane can affect the glide slope beam. The presence or
absence of somebody in the tower doesn't change the physics of how
microwaves interact with metallic bodies.

Thanks, but that wasn't my question. In fact, you snipped my question
out of the 'quote' which you included in your response.

--
Mark Hansen, PP-ASEL, Instrument Airplane
Sacramento, CA

In article ,
Roy Smith wrote:

Mark Hansen wrote:
In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

The reason you're supposed to keep clear of the ILS critical area is
because your airplane can affect the glide slope beam. The presence or
absence of somebody in the tower doesn't change the physics of how
microwaves interact with metallic bodies.

The glideslope signal is reflected off the ground. The structure that
houses the GS antenna is located far enough down the runway so that the
GS signal is bounced off the ground approximately 1000 feet from the
approach end of the runway. If you look, you will notice the ground is
quite flat and level where the signal is reflected. An object,
especially metal, which intrudes in the space between the antenna and
the runway threshold at the approach end of the runway may distort the
GS signal.

"Mark Hansen" wrote in message
...
In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

I've been looking through the AIM, and can't find anything like
this. It does say that when the tower is open, it will keep the
area clear when there is an aircraft past the FAF and the weather
is below 800/2.

Is there a rule which states that the ILS critical area must be
kept clear at any time when the tower is not in operation?

Can you please provide a reference?

Maybe no rule but good airmanship should keep you out of the critical area
if its required.

On 11/20/2005 3:56 PM, Chris wrote:

"Mark Hansen" wrote in message
...
In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

I've been looking through the AIM, and can't find anything like
this. It does say that when the tower is open, it will keep the
area clear when there is an aircraft past the FAF and the weather
is below 800/2.

Is there a rule which states that the ILS critical area must be
kept clear at any time when the tower is not in operation?

Can you please provide a reference?

Maybe no rule but good airmanship should keep you out of the critical area
if its required.



How does the pilot know it is required if not told to keep clear of
the area by the control tower?

--
Mark Hansen, PP-ASEL, Instrument Airplane
Sacramento, CA

"Mark Hansen" wrote in message
...

How does the pilot know it is required if not told to keep clear of
the area by the control tower?


He can't know for sure when it is required. But if he's issued an IFR
departure clearance and not told to hold for release he knows it's not
required and without an IFR departure clearance there's little reason to
enter the critical area.

Mark Hansen wrote:

How does the pilot know it is required if not told to keep clear of
the area by the control tower?

By knowing the weather, knowing that someone is on the approach, and
knowing where the ILS critical area is.

--
Peter
























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On Sun, 20 Nov 2005 11:28:09 -0800, Mark Hansen
wrote:

In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

I've been looking through the AIM, and can't find anything like
this. It does say that when the tower is open, it will keep the
area clear when there is an aircraft past the FAF and the weather
is below 800/2.

Is there a rule which states that the ILS critical area must be
kept clear at any time when the tower is not in operation?

Can you please provide a reference?

Thanks,


All I can find is a statement in the AIM that the ILS critical area is NOT
protected at uncontrolled fields; so y'all be careful out there!


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

Ron Rosenfeld wrote:
On Sun, 20 Nov 2005 11:28:09 -0800, Mark Hansen
wrote:


In this month's AOPA Flight Training magazine, I read an article
which implied there was still some requirement to remain clear of
the ILS critical area even when the tower was closed.

I've been looking through the AIM, and can't find anything like
this. It does say that when the tower is open, it will keep the
area clear when there is an aircraft past the FAF and the weather
is below 800/2.

Is there a rule which states that the ILS critical area must be
kept clear at any time when the tower is not in operation?

Can you please provide a reference?

Thanks,



All I can find is a statement in the AIM that the ILS critical area is NOT
protected at uncontrolled fields; so y'all be careful out there!


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)
At many airports, such as my home field, KRYY, the glideslope is "unusable" when the
tower is closed... Perhaps that is some additional 'protection'....