ILS critical area when the tower is closed?

On 11/20/2005 2:54 PM, Bob Gardner wrote:

AIM Figure 2-3-16?

Sorry I wasn't clear, Bob. I wasn't asking where the hold short
or ILS markings were or how they were depicted at the airport.


If there are taxiway markings for an ILS critical area,
and the departing pilot knows that the weather is even close to 800-2, s/he
doesn't have to depend on a controller for instructions. The controlling
authority (in the absence of a controller) knows what the situation with
regards to inbounds is and can advise the departing pilot if there is
someone on the way in. "Hold short of runway 16, traffic on two mile final."

Just who is going to say "Hold short" when the tower is closed?

Perhaps the only time you have to worry about the ILS critical area
is when the weather is below 800/2, in which case only IFR departures
will be of concern, and they won't get their clearance unless the
airspace is clear.

Assuming the weather is above VFR minimums, VFR arrivals and departures
could interfere with the ILS system, and there appears to be no protocol
to prevent that, since any airplane using the system isn't depending on it
to get to minimums anyway?

Well, I guess I have my answer.


Bob Gardner

"Mark Hansen" wrote in message
...
On 11/20/2005 12:41 PM, Bob Gardner wrote:

I don't see what the tower being open or closed has to do with it. They
don't shut down the ILS when the last controller goes home, and a plane
in the restricted area distorting the glideslope signal is not a good
thing.

Sure. But the tower is the controlling authority which is instructing
planes to hold clear of the ILS critical area.

If the tower is not in operation, who gives the order?

If the pilot on the ground is supposed to know when to hold clear,
how does he know? He may not even know a plane is using the
ILS. And besides, the tower only needs to keep it clear when the
weather is below 800/2, so does this go for the non-towered airport
as well?

Where is this defined?


Bob Gardner

"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?

Thanks,

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




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




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