Questions tagged [aeronautical-charts]

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

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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 ...
PJNoes's user avatar
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34 votes
2 answers
15k 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 ...
Geoffrey Gallaway's user avatar
32 votes
2 answers
15k 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 ...
ryan1618's user avatar
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27 votes
7 answers
10k 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 ...
codeaviator's user avatar
24 votes
3 answers
4k views

Explaining a "Great Circle Route" to young Civil Air Patrol cadets

What would be an easily understood explanation of a "Great Circle Route" for young Civil Air Patrol cadets who are being introduced to aviation and navigation principles for the first time?
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21 votes
3 answers
21k views

What does the "T" on sectional charts mean in reference to airspace altitude?

These are present in the San Francisco class bravo / Oakland class charlie and O'Hare class bravo / Midway class charlie.
slantalpha's user avatar
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21 votes
3 answers
8k 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 ...
seattle272SP's user avatar
21 votes
2 answers
6k views

What is the reason for this route while flying from USA over Cuba?

I was flying from Canada to Jamaica, and just past Florida the plane turned 90 degrees towards Nassau. It then continued over Cuba. Is this because of the situation between Cuba and the United States? ...
Mark's user avatar
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21 votes
3 answers
9k 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 ...
egid's user avatar
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19 votes
2 answers
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?
J.FLLT's user avatar
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19 votes
1 answer
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 ...
Ryan Mortensen's user avatar
18 votes
2 answers
1k 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 ...
Mitch's user avatar
  • 181
17 votes
2 answers
2k 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 ...
marcprux's user avatar
  • 271
16 votes
5 answers
10k 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 ...
dazedandconfused's user avatar
16 votes
5 answers
17k 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 ...
CJBS's user avatar
  • 1,442
15 votes
2 answers
2k views

What does "MERMA" mean on the Los Angeles TAC chart?

Just wondering what "MERMA" means on the Los Angeles TAC chart:
slantalpha's user avatar
  • 4,203
15 votes
1 answer
1k views

Why publish an unusable airway?

If an airway is marked unusable, why publish it? Secondary question, can RNAV still be used?
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15 votes
4 answers
4k 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 ...
Brian's user avatar
  • 153
13 votes
4 answers
9k 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 ...
ryan1618's user avatar
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13 votes
3 answers
3k 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 ...
Greg Bacon's user avatar
  • 5,698
13 votes
2 answers
1k 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 ...
Dan's user avatar
  • 260
13 votes
1 answer
2k 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 ...
lemonincider's user avatar
  • 7,557
13 votes
1 answer
2k 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 ...
TomMcW's user avatar
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12 votes
3 answers
1k 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. ...
kevin's user avatar
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12 votes
2 answers
459 views

Where are the "Admitted Aircraft symbols" on Jeppesen VFR aerodrome charts defined?

Jeppesen VFR aerodrome charts depict several symbols for "admitted aircraft". However, even after checking several symbol legends I never found a definition of these symbols. Does anyone ...
rauberdaniel's user avatar
12 votes
3 answers
31k 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?
jskypilot's user avatar
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12 votes
1 answer
722 views

What is "Accident" on a VFR sectional?

Seen on the map just north of 2G4 (Garrett Country Airport) is a dot labeled "Accident". (Direct link to map.) I never noticed something like that before, and didn't fly close enough to ...
Kenn Sebesta's user avatar
  • 5,092
12 votes
2 answers
3k 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?
Lnafziger's user avatar
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12 votes
1 answer
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 ...
Brian Tusi's user avatar
  • 1,093
12 votes
2 answers
17k 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
wbeard52's user avatar
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12 votes
2 answers
2k 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 ...
user avatar
11 votes
1 answer
414 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 ...
Nils's user avatar
  • 215
11 votes
2 answers
2k 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?
dovganutsra's user avatar
11 votes
3 answers
5k 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 ...
ABC123's user avatar
  • 596
11 votes
2 answers
313 views

What are the lines of triangles on the DCA RWY 19 River Visual approach chart?

A recent update of a certain flight simulator made me revisit this chart and I had not noticed the lines of triangles (at the Chain Bridge / Roosevelt Bridge etc, but not at the Key Bridge) in a past ...
cavok's user avatar
  • 211
10 votes
2 answers
2k views

What organisation owns intersection names?

I understand that five letter intersection codes (such as WARPI, PAPPI, KUBBS, ROSLY, ZALPO, ...) are unique in the world. However, their names don't comprise a national prefix (as aircraft tail ...
scarpaz's user avatar
  • 209
10 votes
3 answers
6k 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?
pmoubed's user avatar
  • 2,025
10 votes
4 answers
36k 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?
flyingfisch's user avatar
  • 14.5k
10 votes
1 answer
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)?
Dev999's user avatar
  • 103
10 votes
2 answers
1k 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?
Greg Bacon's user avatar
  • 5,698
10 votes
1 answer
505 views

What do these double Class Bravo airspace floor and ceiling limits mean?

While browsing SkyVector I came across these double Class B airspace limits within the same section (is that what you call it?). I'm wondering what it means and what the difference is between this and ...
Basaa's user avatar
  • 203
10 votes
1 answer
568 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 ...
Bob Jones Sr.'s user avatar
10 votes
1 answer
687 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 ...
Peter Schilling's user avatar
10 votes
1 answer
406 views

Why are different distances listed for the ILS and the LOC on this approach chart?

Maybe someone has an idea why are there two separate distance values (marked in blue) for ILS and LOC approaches?
Julious's user avatar
  • 101
10 votes
1 answer
17k views

What is the difference between VFR Flyways, Corridors and Transition Routes?

What is the difference between: VFR Flyways VFR Corridors VFR Transition Routes I can find a Flyway chart on the reverse side of the TAC chart and also Transition Routes in the TAC chart. But where ...
Steven Ryu's user avatar
10 votes
2 answers
444 views

On old sectional charts, what was the purpose of the domestic ADIZ regions and what was the difference between a "Defense Area" and an "Open Area"?

Looking at an old US sectional chart from 1956, I noticed a few oddities around where Air Defense Identification Zones (ADIZs) were placed. Compared to modern airspace where the US ADIZ is strictly ...
Trevor Johns's user avatar
10 votes
2 answers
9k 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 ...
digitgopher's user avatar
  • 5,281
10 votes
2 answers
47k 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 ...
Steve V.'s user avatar
  • 23.2k
10 votes
2 answers
931 views

What is the primary reason that the non-towered airports ACV, TVL, SGU, BIH, and SIT/PASI 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 ...
quiet flyer's user avatar
  • 22.2k
9 votes
2 answers
1k 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?
Pugz's user avatar
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