Questions tagged [icao]

The International Civil Aviation Organization is a UN body that develops international aviation standards.

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34 votes
5 answers
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What is Class F airspace, and why is it not used in the US?

I've read that ICAO defines Class F airspace but the FAA has chosen not to use the airspace class in the US. What is the ICAO definition of Class F airspace and how does it differ from other airspace ...
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33 votes
1 answer
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When do we use IATA codes and when do we use ICAO codes?

I found on this website several questions speaking of IATA, ICAO and airports codes. The fact that two identification codes for the same airport exist means there are cases where you use one, and ...
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25 votes
5 answers
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May an emergency aircraft land on a closed runway?

Let's say that you're on approach to a remote airport to refuel (for arguments sake, Funafuti International Airport, Tuvalu), with 1-2 hours of fuel remaining in your aircraft. Contacting ATC to ...
24 votes
7 answers
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Where to find a waypoints/fixed points, navaids and airports database?

I wonder if it is possible to download a database with waypoints, navaids, airports and airways between them. I've been working with AIP documents but it's difficult to get raw information from them ...
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Why does the ICAO alphabet use "Charlie" for C?

Why does the ICAO alphabet use "Charlie" for C? Specifically, why choose "Charlie", which has a "Ch" sound, rather than a word with the hard "C" such as "Carl"? A cursory Googling turns up nothing.
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22 votes
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To which airspace does the border of two adjacent airspaces belong to?

Consider two adjacent airspaces of different categories. For example, airspace G is up to 2500' and above this is an airspace D. The border is at 2500'. Which airspace are you in if flying at exactly ...
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20 votes
4 answers
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What is different between a Cat IIIA, Cat IIIB, and Cat IIIC ILS approach?

In terms of aircraft equipment, approach minimums, procedural differences, and anything else relevant, how do the 3 types of a Cat III ILS differ from one another?
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17 votes
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What is the difference between ICAO, JAA, FAA, EASA, and CAA?

There seems to be many regulation bodies across the globe, how are they different and how are they alike? Specifically, how is ICAO different from the rest?
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17 votes
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Why isn't an LPV SBAS approach considered a precision approach according to ICAO?

According to ICAO's classification, LPV SBAS approach is in the APV group, because it doesn't meet some specifications for precision approaches. But what exactly does it not meet? Glossary: LPV: ...
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17 votes
1 answer
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How is airspace in the Persian Gulf determined?

In the wake of the Qatar diplomatic crisis, I saw this image from Business Insider: How is airspace in the Persian Gulf determined? Why, for instance, does Bahrain have such a disproportionately ...
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1 answer
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What is typical ATC procedure when a non-pilot calls from a commercial flight for help?

"This is ShinyWings 123, I'm not a pilot, the pilot and copilot are unconscious. Help." Probably a day air traffic controllers dream of with dread, when a member of cabin crew, or even worse,...
16 votes
5 answers
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Is an alternate airport always required when flying internationally?

When flying a domestic US flight, an alternate airport is not required unless the weather is below specific minimums at the destination. What are the rules when on an international flight plan and ...
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15 votes
1 answer
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Why do some airports not have ICAO codes?

This is a follow up to my previous question What do numbers signify in airport codes? In that case, I was asking why my local airport (Markham Airport) had a number in its code (CNU8). I later ...
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14 votes
5 answers
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What are the advantages, disadvantages and current state of affairs for text-based ATC?

This answer has a rather interesting (and quite lengthy) discussion, on a concept of using text-based rather than voice-based communication between ATC and the cockpit. As it turns out, the FAA has ...
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13 votes
2 answers
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Where can I find old (historical) FIR map?

I'm doing a research with FIR Ho Chi Minh (formerly named FIR Saigon). I've read a document which said: During the Fall of Saigon, ICAO, in 28th of April 1975, had divided FIR Saigon into 3 AOR: ...
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3 answers
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How to get registration from ICAO 24 bit code?

The description of PlanePlotter claims that it can determine the registration letters from the ICAO 24 bit address algorithmically for some countries. The only thing i got so far is how to get the ...
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Can a pilot with an ICAO Multi-Crew Pilot License fly an airliner into the U.S.?

In the question How do non-US pilots get the hours necessary for an ATP?, the question was raised of whether we have 250 or 500 hour foreign pilots flying airliners into major U.S. airports. DeltaLima'...
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12 votes
1 answer
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Can two airports have a different ICAO code but share the same IATA code?

I am searching some airports databases and I find some airports with the same IATA code with different ICAO codes. Is it mistake in the database? Is it OK? For example: Beaufort MCAS - Merritt ...
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11 votes
2 answers
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Why are some item numbers missing in ICAO flight plans?

I was looking at an ICAO flight plan and observed that there are only specific ITEMS mentioned in it (see example below)? What is the reason behind excluding the item numbers 1, 2, 3, 4, 5, 6, 11, 12, ...
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How to know that single engine aeroplanes are not allowed to depart on the TETAN SID?

I'm studying for my IR exam and came across another tricky AIP question. Which of the following statements about the TETAN 1A standard departure chart are correct? Single engine aeroplanes ...
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10 votes
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What is the exact meaning of "manoeuvring" when said by ATC in reference to traffic?

In the UK, when receiving a basic service, sometimes the ATC unit passes traffic information. They may say it like this: “Traffic to your three o'clock, similar level, C172 manoeuvring.” What ...
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2 answers
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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 ...
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636 views

Is it possible to fly an EASA registered airplane with an ICAO license?

Is it possible to fly an EASA registered airplane with an ICAO license? My problem is the following: I have obtained my ICAO PPL license in Argentina with 52 flight hours but currently I live in ...
10 votes
2 answers
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How do non-US pilots get the hours necessary for an ATP?

I'm wondering about the possible lack of real-world flying experience by pilots in non-US carriers In the US, aspiring airline pilots can work at a variety of jobs, like instructing, towing banners, ...
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Are conditional line-up clearances still valid if the referenced traffic initiates a go-around / missed approach?

Suppose you are the captain of Big Jet 345: Big Jet 345, behind landing Boeing 757, line up runway 27, behind Behind landing Boeing 757, line up runway 27, behind, Big Jet 345 Now suppose the ...
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1 answer
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Are airline ICAO codes unique?

Tiger Airways Singapore's IATA code is TR while Tiger Airways Australia's one is TT, but the ICAO code for both is TGW. I thought that the ICAO codes are meant to be unique from one airline to another,...
9 votes
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Can one country really ban another from using its airspace?

Consider the recent restriction by Saudi Arabia on Qatar Airways flights, which prevents Qatar flights from flying over Saudi airspace. Qatar now has to use longer routes and go fly around the land ...
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1 answer
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What were the 20 airspace classes in the US before 1993?

ICAO adopted the current airspace classification in 1990. The US followed suit in 1993. But, I found this: In case you didn't know, the U.S. had 20 different types of airspace designations prior ...
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8 votes
2 answers
1k views

What methodology did ICAO use to create the overall code nomenclature for airports?

If an airport is from North America, then it starts with K and so on. Where did ICAO get the letters from? Why does the Philippines region starts with A? Why do airports in Izmir have LTBx prefix? ...
8 votes
1 answer
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What does ICAO database "engine count c" mean?

In the official ICAO database 5 aircraft are marked with an engine count C. What is that supposed to mean? Normally engine count is a number (0,1,2,3...).
8 votes
1 answer
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Where can the ICAO recommendations be found?

ICAO issues recommendations/rules/statutes/something? that standardizes the regulations for international air travel world-wide. What are these "rules" officially called and where can they be found?...
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8 votes
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What is the difference between ICAO Annexes and Documents?

I have gone through many ICAO and aviation related sites, but I still can not understand the basic difference between annexes and docs. What is it?
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1 answer
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Are there countries where not all plane crashes are investigated (even if deadly)?

background information I was struck by the news of this deadly plane crash on 20 Dec 2018 which claimed 8 lives and apparently is not investigated as the plane and its potential survivors were not ...
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7 votes
2 answers
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What will the 737 MAX 7, 8, and 9 ICAO IDs be?

Since the ICAO identifiers B737, B738, and B739 are already taken, what will the ICAO identifier for the 737 MAX 7, 8, and 9 be? Would it possibly be B73M7 etc?
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7 votes
1 answer
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Based on what concept/strategy is a new aircraft ICAO code assigned?

I refer to the official ICAO database. BOEING 747-8 BBJ B748 LandPlane Jet 4 H BOEING BBJ (747-8) B748 LandPlane Jet 4 H I fail to understand ...
7 votes
2 answers
13k views

Where can I find a free list of ICAO and IATA airport identifiers?

Is there an open source or free comprehensive (or close to it) list of ICAO to IATA airport identifiers? The official list from ICAO costs hundreds of dollars. I suppose such a list could be scraped ...
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7 votes
2 answers
274 views

What body creates legally binding aviation regulations in Europe?

Currently trying to get general picture of aviation organisations in Europe. At what stage do regulations get the status of a law? ICAO issues SARPs, they are certainly not a law. Then, on the basis ...
7 votes
1 answer
180 views

Do noise abatement procedures have an impact on aircraft emissions?

The ICAO has imposed Noise Abatement Departure Procedures (NADP1 and NADP2) in order to limit the noise impact of departing aircraft on communities living nearby airports. Could noise reduction lead ...
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7 votes
4 answers
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What is the correct way to get established on the outbound track on this approach?

If you have been cleared to LCA (from the direction shown by the red arrow) then outbound on the procedure, what is correct way to get established on the outbound track? Ideally, I'm looking for an ...
6 votes
2 answers
4k views

What is the maximum amount of noise an aircraft is allowed to generate?

Has the FAA regulated yet the maximum dBs of noise an aircraft's engine is allowed to generate, and what the range of "safe operation" would be? If they have, what are their regulations on it?
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Do the ICAO and IATA codes for an airport ever change?

Do ICAO and IATA codes ever change for airports in time? If they do, how often does it occur? I am developing an app for airports and I am thinking of setting the uniqueness of an airport through ICAO ...
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What are the ICAO PANS? What are their contents?

There are how many I.C.A.O. PANS? What are their basic contents? I have tried a lot in internet, but could not find out.
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1 answer
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Where is the formal ICAO flight plan text format specified?

I want to write a parser for ICAO format flight plans, like the one shown below. ...
6 votes
1 answer
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What sensors are required to fly RNAV 5 airways?

In the example shown above: Is an aircraft required to have all 3 sensors listed or just one of them to fly the L512 airway? What ICAO reference confirms the answer? Does 'critical DME' (bottom row) ...
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6 votes
1 answer
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Can a captain fly in the right seat as SIC under part 129?

Re a Part 129 air carrier that is short of co-pilots: Can a pilot who usually flies in the left seat (B737 aircraft: non-US registry) as the Pilot-in-Command fly in the right seat as the SIC (co-...
6 votes
0 answers
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Why do some airlines have different flight numbers for IATA and ICAO? [duplicate]

Most of the time when I see flights on either flightradar24 or flightaware it doesn't matter whether you use the 2-digit IATA code or the 3-digit ICAO code, the flight number is the same, i.e. a ...
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5 votes
3 answers
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How do humanitarian flights arrange special permissions to fly when ATC isn't available?

In natural disasters, transportation infrastructure is often among the first and most critical of public services to be disrupted. Not coincidentally, it's also a time that tends to see small airports ...
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4 answers
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Is there a definition of light/medium/heavy aircraft?

I'm surprised this hasn't been asked before but I couldn't find it by searching. For separating arriving aircraft, ICAO PANS-ATM-Doc 4444 Air Traffic Management refers to aircraft as "LIGHT", "...
5 votes
1 answer
823 views

Which "pilotless aircraft" did the authors of the 1944 Chicago convention have in mind?

The Convention on International Civil Aviation (a.k.a. the "Chicago convention"), includes right from its first version, signed in 1944, an article about "pilotless aircraft". The ...
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What ICAO codes are reserved for TIS-B use?

Using my ADS-B receiver, In the past few months I've seen a lot of what I think are TIS-B contacts. They seem to cycle through a few different ICAO ID prefixes, but I see a lot that are of the form (...
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