Does anyone know if the FAA has guidelines or standards for topo work?
I know it exists for PACS/SACS and approach work, but is there a standard for general topo; I.E. asphalt, SD/SS structures and the like?
Look at FAA AC 150/5300-18B. The standards think what you are looking for is in there under the Airports GIS initiative.
Some of the requirements are pretty tight (such as runway end points, navaid location, etc.), others are somewhat sloppy (up to 3' horizontal for shoulder edges).
Yeah, I've already looked through that circular. I was more interested in design topo standards.
Perhaps the USACE standard would suffice?
http://140.194.76.129/publications/eng-manuals/em1110-1-1005/toc.htm
Rob,
Let me talk to our airside pavement engineers tomorrow and see if there are any ACs on their side that cover in greater specificiy what you are after. Can you detail precisely what kind of design or construction guidance you are looking for?
> Can you detail precisely what kind of design or construction guidance you are looking for?
Re-doing a larger apron that will be "matched" into a perimeter road, a taxi lane (with 4 taxi way int-x's) and existing (newer) pavement adjacent to some larger hangars.
There is a discussion in this thread that may be useful.
http://beerleg.com/index.php?mode=thread&id=53188#p53247
As I understand it the specifications for topo on any surface used by aircraft are extremely high - much tighter than most people would think reasonable. Right or wrong this is what they insist on, so you have to achieve it somehow. The last time that we bid one of these type of projects the only way to do it was to mark out the grid with a total station then use a digital level to get the point elevations.
> As I understand it the specifications for topo on any surface used by aircraft are extremely high - much tighter than most people would think reasonable.
We have a VERY GOOD airport division in our company and one of the guys here knows airport specs like the back of his hand. He also keeps up on the Circulars. He could not find any specs for design topo. There are specs for construction, which is the +/-0.04.
Rob,
My apologies. It's taken a lot longer to get our pavement engineer's attention than I thought. He's a very bright kid, but he's one deep and very busy.
He thinks the info you are looking for will be in AC 150/5370-10A.
However, the FAA lists that as a canceled AC. However, our airport still uses the specifications it contains for design.
He's going to run down precisely which AC (or ACs) replaced it and get back to me later today, but he doesn't think the pavement specs will have changed significantly since the FAA regional office still OKs them for current projects.
Rob,
Here's his further clarification:
"Check out P-501 in the attached document (150/5300-10E). Specifically look at page 501-31 under (4) Grade. I think that’ll answer the questions.
For additional background, see AC 150/5300-13, Airport Design. Under the Surface Gradient and Line of Sight Chapter, it’ll cover the edge drop at the asphalt/grass interface. Figure 5-4 is particularly useful. We put this drop at the joint between the PCC and the asphalt. Most airports put the 1.5” drop at the edge of the grass."
Hope this helps.
If you STILL don't have the answer, call the engineering division in your regional FAA office. Our guys in Atlanta are very good at running down even the most esoteric questions.
Brian