Questions tagged [aeronautical-charts]

For questions relating to navigation charts, but not performance charts.

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55
votes
1answer
7k views

What is significant about the number 8069 ft?

On a sectional chart legend, the airport icon with a solid magenta or blue disk is labeled as "Hard surfaced runways 1500 ft to 8069 ft in length". This seems like an extraordinarily arbitrary number ...
34
votes
2answers
10k views

What does “OBJECTIONABLE” indicate on a VFR chart?

On the Tulsa, Oklahoma VFR sectional the top of the outer Class C ring says "OBJECTIONABLE". Does this indicate some information on the chart is in dispute? I don't see anything in the VFR chart ...
32
votes
2answers
9k views

What does the snowflake with temperature symbol on an approach plate mean?

I've only seen the snowflake symbol with temperature listed on this one approach plate for KASE airport in Aspen, CO. I looked for it in the legend but didn't find it. Does anyone know what the ...
26
votes
7answers
9k views

What does the “DO NOT USE FOR NAVIGATION” indication mean?

Sometimes when I'm browsing IAC charts online I find a "DO NOT USE FOR NAVIGATION" notice printed on the chart. Not always though. For example, have a look at the chart for Queenstown RNAV (RNP) Y ...
20
votes
1answer
2k views

Why would an airport be depicted with symbology for runways longer than 8,069 feet even though it is reported on the sectional as 7,200 feet?

This airport, KMKO, Muskogee-Davis Regional in Oklahoma southeast of Tulsa is depicted on the sectional chart with symbology normally reserved for airport with a hard surfaced runway longer than 8069 ...
20
votes
3answers
4k views

Why does Class D overlap class B around SeaTac? …and other Seattle Bravo airspace strangeness

I noticed KBFI's class delta overlaps SeaTac's bravo by 500 to 700 feet. Does anyone know which tower the overlapping airspace belongs to? Does it classify as Bravo airspace and do you need to hear ...
20
votes
3answers
6k views

Do pilots using an electronic flight bag need to carry paper charts?

If a pilot uses an electronic flight bag (say, an iPad with ForeFlight or WingX), are they required to carry paper charts as a backup? Do different rules apply to operations under Parts 91, 121, and ...
17
votes
2answers
4k views

What do these white on red words indicate on a London Heathrow taxiway chart?

What do the words in white block capital letters over a red background denote on this aerodrome chart of LHR?
17
votes
2answers
975 views

How precisely are airspace borders defined?

I'm studying for the commercial drone certificate. In Tucson, AZ the class C airspace covers about half of the city, but the charts don't list the exact point that it ends. Here's a portion of the VFR ...
15
votes
2answers
2k views

What does “MERMA” mean on the Los Angeles TAC chart?

Just wondering what "MERMA" means on the Los Angeles TAC chart:
15
votes
4answers
9k views

Where can I find GA VFR maps for Australia?

Are there any sites similar to SkyVector (US-based) for GA aviation maps in Australia? I understand that Air Services Australia has miscellaneous single-purposes maps available, but they seem to be ...
14
votes
5answers
8k views

Where can I get the FAA data that defines airspace, including MOAs etc.?

I was looking at http://www.gelib.com/aeronautical-charts-united-states.htm, where you can download shape files for Google Earth that show US airspaces. I'm writing some software that has a similar ...
14
votes
2answers
983 views

How does Jeppesen create its US charts?

The Jeppesen and FAA IFR plates represent the same information in different ways. The FAA publishes its charts for free, but the underlying data that goes into the charts (e.g., exact coordinates of ...
14
votes
1answer
990 views

Why publish an unusable airway?

If an airway is marked unusable, why publish it? Secondary question, can RNAV still be used?
13
votes
4answers
5k views

What is the thick, dashed, magenta line on a sectional chart?

In the attached area of the sectional chart we see restricted areas R-2101 and R-2102. Also covering that general area is a circular, thick, dashed magenta line. There's a notice there that I assume ...
13
votes
3answers
1k views

Why is the clearance delivery frequency included on an approach plate?

Approach plates include frequencies in the order that pilots will require them, reading from left to right. The example below from McClellan-Palomar’s ILS or localizer/DME approach to runway 24 is a ...
13
votes
2answers
2k views

Is there an online source for European Instrument Approach Procedures?

The FAA offers instrument approach procedures on their website free of charge (FAA Charts). Is there a similar site provided by EASA or the EU?
13
votes
1answer
2k views

What are those thin magenta lines on the Sectional / Terminal Area Chart near Death Valley?

Due west of KLAS and Death Valley are a large number of MOAs and Restricted areas. On the sectional and terminal area charts, there are thin magenta lines snaking over some of the mountain tops. What ...
13
votes
1answer
1k views

What are those 5-character alphanumeric waypoints?

On the following High IFR chart from skyvector.com I notice along the meridian at 30' intervals there is a green symbol the same shape as an RNAV waypoint. Next to them are 5-digit identifiers, but it ...
12
votes
3answers
629 views

How many airport charts do airline pilots have in the cockpit?

I always wonder how many "backup" approach charts and airport diagrams airline pilots have in case the plane has to divert. I imagine a few possibilities: There are no approach charts in the cockpit. ...
12
votes
2answers
388 views

Gas Venting Stations: What's The Big Deal?

On sectional charts you can see that, through various restrictions, regulators encourage pilots to avoid flying too close to Gas Venting Stations. These seem to be places where natural gas may ...
11
votes
4answers
24k views

How do I determine the VFR pattern altitude at an airport?

How do I determine the VFR pattern altitude at an airport? Can I find it on a sectional?
11
votes
1answer
12k views

What are Runway Declared Distances?

Perusing through the A/FD in the United States I see that some runways have declared distances while others do not. What is the meaning of: TODA TORA ASDA LDA
11
votes
3answers
16k views

How do you know if a VOR is High, Low, or Terminal?

Is there any way of telling on both a VFR and IFR chart what type of VOR we are looking at?
11
votes
2answers
39k views

Is there a difference between MEA and MOCA within 22 nm of a VOR?

As we all know from our instrument training, the MOCA is: MINIMUM OBSTRUCTION CLEARANCE ALTITUDE (MOCA)- The lowest published altitude in effect between radio fixes on VOR airways, off-airway ...
10
votes
3answers
3k views

What does the T in RVR-T stand for?

In the Chart Supplement (A/FD) for CRQ/KCRQ, you will find RVR-T for runway 24. I was wondering what 'T' stands for?
10
votes
1answer
2k views

What does 00 mean on a sectional below the airport runway information?

What does 00-50 mean on the sectional chart under PHNL (see picture)?
10
votes
2answers
983 views

What is this racetrack-shaped Special Use Airspace, and why isn’t it on the VFR sectional?

What type of SUA is AR633A, the cyan racetrack-shaped SUA north of Knoxville, Tenneessee (KTYS) depicted below on sua.faa.gov? Why doesn’t it correspond to anything on the VFR sectional?
10
votes
1answer
263 views

Why are there out-of-date tower frequencies on the VFR sectional chart, without a NOTAM?

I flew today to Salinas, CA and had a little trouble reaching Salinas tower (KSNS). The current VFR sectional shows the tower frequency as 119.4. However, apparently the frequency changed to 119.525 ...
10
votes
3answers
3k views

Where is it documented an airport is military?

On sectional charts (at least in the US) military airports appear with the same symbols as public airports, eg. KBKF. Some military bases are within restricted airspace. I would assume all military ...
10
votes
1answer
737 views

What does a 10nm/20nm circle on instrument approach charts mean?

A lot of instrument aproach charts (VOR or ILS) have a circle around the navaid. It can be 10/20 NM or in km, like the 20km circle in the image. What does this circle mean?
10
votes
1answer
520 views

Where can the airspace boundary coordinates for Fayetteville TRACON be found?

I would like a map depicting the airspace owned by Fayetteville TRACON that includes lat/long coordinates (i.e. not just a cartoon-y outline with no information). Ideally, I'd like to find a site ...
9
votes
2answers
835 views

What is “abnd” on the U.S. VFR Sectional Chart?

I have looked at the sectional legend and FAA aeronautical chart user guides and have not seen any answer for this. What is “abnd” on the U.S. VFR Sectional Chart?
9
votes
1answer
2k views

What is “(CFMCC)” on an ILS approach chart?

I'm studying the ILS or LOC RWY 3 approach chart for KMKC. I'm trying to figure out what "(CMFCC)" at the runway means. Is it a computer navigation aid?
9
votes
1answer
297 views

Do FAA sectional charts show all power/transmission lines?

The FAA's sectional aeronautical charts include some power/transmission lines. How complete is this? I am specifically interested in using something like ForeFlight for aeronautical charts while hot ...
9
votes
1answer
254 views

What is the purpose of this interesting pattern of class E airspace in northwest Alaska?

Perusing SkyVector today I noticed this airspace pattern: It can be viewed in more detail here. What immediately jumped out at me is that there are no charted airports in any of this airspace; the ...
9
votes
1answer
948 views

What's a metering fix?

The Instrument Procedure Handbook says on page 3-18 "Arrival delays typically are absorbed at a metering fix. This fix is established on a route prior to the terminal airspace, 10000 feet or ...
9
votes
1answer
2k views

On SIGWX (significant weather) charts, what does **/** mean?

On SIGWX charts, it shows pairs of symbols with, say, */** or **/**. I know what the symbols mean on either side, but why are ...
8
votes
2answers
7k views

How should I operate within the dashed magenta lines next to Class D airspace?

I am unsure of how to operate within this area (red dashed line) without connection to ATC. It appears to come off of class D airspace. Can anyone provide an explanation of what this area is and how ...
8
votes
1answer
7k views

Why are airspaces depicted in AGL?

Generally we fly under the rule of QNH which means our IA is above mean sea level. And as we all know airpace limits are charted in MSL. Then, why the definitions of airspaces are they (class C, D and ...
8
votes
2answers
3k views

What is 20NM reference point in “CTC SOCAL WITHIN 20NM”?

In Los Angeles TAC you'll see magenta boxes with SOCAL frequency and other information. I was just wondering what is 20NM reference point is? in other word, 20NM from where or what?
8
votes
1answer
607 views

What activities take place in the warning areas offshore of Washington, D.C.?

Looking at the Washington sectional, several areas offshore are designated "Warning" areas: W-386, W-107, W-105 etc. The only notes given are "National Defense Operating Areas. Operations hazardous to ...
8
votes
1answer
302 views

Where is this VFR reporting point (“Water Tank” near Thousand Oaks, CA) in real life?

I was looking at the VFR sectional near Thousand Oaks, California. The chart has a "WATER TANK" labeled, but I see many water tanks in Thousand Oaks on the Google Maps satellite view. Does anyone ...
8
votes
2answers
3k views

How are you supposed to get the East/West variation on this question in the FAA PPL written exam?

While taking a practice test, I needed to calculate the magnetic heading between two airports. Most of the time I run into a problem, the map will provide me with isogonic lines with the East/West ...
8
votes
1answer
125 views

Which timezone do airspaces that cross a time zone boundary belong to on a VFR sectional?

The Albuquerque VFR sectional claims that the airspace table in the margin use local time, but some of the airspaces in the table cross timezone boundaries. Which timezone do those airspaces belong ...
8
votes
2answers
5k views

How are Victor airways defined and numbered?

I am wondering how Victor airways get determined. What determines how many 'segments' they are? For example some airways connect two VORs only, while other airways stretch across (or "connect the ...
8
votes
1answer
451 views

Is it ok to use an iPad (or similar consumer hardware) and electronic charts for GA in Europe?

I'm wondering if it is it ok to use a consumer tablet and electronic charts (e.g. within the AirNav Pro app) instead of the paper version for recreational VFR single-piston flights? Edit: to clarify,...
8
votes
1answer
802 views

When is this Class D airspace not Class D airspace?

The Terminal Area Chart (TAC) shows the Class D airspace for Los Angeles International Airport (KLAX) view the full TAC. I have highlighted in green the north and south portions of the Class D ...
8
votes
2answers
443 views

What is the primary reason that the non-towered airports KACV and KTVL have E4 extensions to E2 airspace?

NOTE-- this question is not about why it was desired to protect the airspace that ended up within the E4 "extensions". Rather, this question is about why that was done by designating that airspace as ...
7
votes
3answers
1k views

What do these polygons mean on VFR charts?

There are a lot of blue polygons on this VFR chart: What do they mean? Source