Class D / Class C precedence

If Class C overlaps Class D (see Portland Troutdale airport), which
airspace takes precedence?

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I can't tell you where it would be written in regs or fars but Troutdale
coordinates with PDX to direct traffic to turn prior to entering PDX
airspace or to stay below their airspace and flight paths. Heading west
from Troutdale you are instructed to turn before Blue Lake.



"Mxsmanic" wrote in message
...
If Class C overlaps Class D (see Portland Troutdale airport), which
airspace takes precedence?

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Dennis writes:

I can't tell you where it would be written in regs or fars but Troutdale
coordinates with PDX to direct traffic to turn prior to entering PDX
airspace or to stay below their airspace and flight paths. Heading west
from Troutdale you are instructed to turn before Blue Lake.

The part that confuses me is that the Class D for Troutdale supposedly
tops out at 2500, but the overlapping sectors of the Class C for PDX
start at 1700 and 2000. The dotted lines for the Class D are inside
the Class C boundaries. So at what altitude would an aircraft pass
from the Class D into the Class C?

I had not previously seen this on a chart. I've seen Class C
impinging on Class B but then the Class C is usually marked T for the
upper limit, so that you know it ends just where the Class B begins.

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Class C should always over lap Class D,
in the outer part you are in Class C, when you get close, you should be
handed off to the tower if you are landing, but the approach controllers
could coordinate your through flight

BT

"Mxsmanic" wrote in message
...
If Class C overlaps Class D (see Portland Troutdale airport), which
airspace takes precedence?

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This is described in AIM chapter 3. The rules for the more restrictive
airspace will apply when there is an overlap.

An obvious example of this is restricted airspaces. The majority of
R-airspaces overlap with G or E airspaces, but in those instances we
don't question which rules apply.


BT wrote:
Class C should always over lap Class D,
in the outer part you are in Class C, when you get close, you should be
handed off to the tower if you are landing, but the approach controllers
could coordinate your through flight

BT

"Mxsmanic" wrote in message
...
If Class C overlaps Class D (see Portland Troutdale airport), which
airspace takes precedence?

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Andrew Sarangan wrote:

An obvious example of this is restricted airspaces. The majority of
R-airspaces overlap with G or E airspaces, but in those instances we
don't question which rules apply.

Restricted areas aren't a form of controlled airspace. The rules
for them is in ADDITION to the controlled airspace rules rather than
one having priority over the other.

"Andrew Sarangan" wrote:
This is described in AIM chapter 3. The rules for the more restrictive
airspace will apply when there is an overlap.

That's an odd way to say it. Consider VFR minimums in overlapping Class D
& B airspace (a pretty common occurance for satellite towered airports
under the shelf of a Class B). The Class D rules say "1000 feet above, 500
feet below, 2000 feet laterally" for cloud clearance. The Class B rules
say "clear of clouds". The D rule is more restrictive, but the B rule is
what's in effect.

An obvious example of this is restricted airspaces. The majority of
R-airspaces overlap with G or E airspaces, but in those instances we
don't question which rules apply.

R is not an "airspace class". There are no VFR minima for R-areas. If I
call up NY Approach, ask to transition R-5206, and receive approval to do
so, the weather minima of the underlying E or G airspace are in effect.

Roy Smith wrote:
"Andrew Sarangan" wrote:
This is described in AIM chapter 3. The rules for the more restrictive
airspace will apply when there is an overlap.

That's an odd way to say it. Consider VFR minimums in overlapping Class D
& B airspace (a pretty common occurance for satellite towered airports
under the shelf of a Class B). The Class D rules say "1000 feet above, 500
feet below, 2000 feet laterally" for cloud clearance. The Class B rules
say "clear of clouds". The D rule is more restrictive, but the B rule is
what's in effect.

I didn't make this up. It is in AIM 3-1-3.

"a. When overlapping airspace designations apply to the same airspace,
the operating rules associated with the more restrictive airspace
designation apply. "

Then it goes on to clarifiy specific designations. It does say that
class B is more restrictive than the other classes, and class A is the
most restrictive.




An obvious example of this is restricted airspaces. The majority of
R-airspaces overlap with G or E airspaces, but in those instances we
don't question which rules apply.

R is not an "airspace class". There are no VFR minima for R-areas. If I
call up NY Approach, ask to transition R-5206, and receive approval to do
so, the weather minima of the underlying E or G airspace are in effect.


Again, I am quoting from the AIM.

"There are two categories of airspace or airspace areas:

1. Regulatory (Class A, B, C, D and E airspace areas, restricted and
prohibited areas); and

2. Nonregulatory (military operations areas (MOAs), warning areas,
alert areas, and controlled firing areas)."

"a. When overlapping airspace designations apply to the same airspace,
the operating rules associated with the more restrictive airspace
designation apply. "

This is not the same as "the most restrictive rules apply". But you did
state it correctly to start out with.

Jose
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"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

Andrew Sarangan writes:

"There are two categories of airspace or airspace areas:

1. Regulatory (Class A, B, C, D and E airspace areas, restricted and
prohibited areas); and

2. Nonregulatory (military operations areas (MOAs), warning areas,
alert areas, and controlled firing areas)."

The two categories can occupy the same space at the same time, but
different classes in the same category cannot.

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