Jump to content

What do those negative numbers in the segmented box mean?


Recommended Posts

I flew into Scottsdale, AZ this past weekend and had to stay out of Luke AFB airspace while remaining below Phoenix Bravo.  Not a problem except for the confusion I suffered due to some of the indications on the Phoenix Terminal Area chart.  I you examine it you'll see a few areas - Class D, pretty much - in which a segmented box has a negative number inside of it (say, -30 or -40). 

 

So what are those negatives indicating?

 

Thanks.

 

 

Link to comment
Share on other sites

You talking about the Class D altitudes like the -40 in the segmented box in the Scottsdale Class D? It means that the Class D airspace starts at the surface and goes up to but does not include (that's what the minus part means)  4000'

 

I you have the chart, it's in the legend.

 

Always kind of wondered about that, like I'd be able to maintain 3999.5'

Link to comment
Share on other sites

I checked it out on skyvector. Look on the legend, it says "minus values indicate surface up to but not including the value."

Looks like exciting airspace. When i go vfr places like that, I will usually be on flight following and ask for permission to enter the class B even if there's a way to get to the destination without. That at least gets you legal even if you stay out of it. Controllers really have been good with it.

Link to comment
Share on other sites

I flew into Scottsdale, AZ this past weekend and had to stay out of Luke AFB airspace while remaining below Phoenix Bravo.  Not a problem except for the confusion I suffered due to some of the indications on the Phoenix Terminal Area chart.  I you examine it you'll see a few areas - Class D, pretty much - in which a segmented box has a negative number inside of it (say, -30 or -40). 

 

So what are those negatives indicating?

 

Thanks.

 

I looked at that chart last year when I flew to Phoenix.  I decided to go IFR just for that reason.  ATC took me straight over Sky Harbor headed north into a right base for RW 7R.  I made an IFR departure essentially on the same course.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.