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Questions tagged [icao-sarps]

ICAO SARPs (Standards and Recommended Practices) are technical specifications that have been recommended by ICAO for member states to adopt as civil aviation policy. This tag should be used on questions about the specifications in the ICAO SARPs rather than about the actual civil aviation regulations in a given place.

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1 vote
1 answer
200 views

What is the reason for a taxiway centerline to extend parallel to the runway centerline?

Why does the taxiway centerline extend on this long distance on the runway?
1 vote
1 answer
181 views

BGBW RNP A vs Straight-in approach

Good afternoon folks. I am a bit confused and trying to find the right answer. This is what we have: Why do we have here minimum for straight-in approach even though the descent angle is 4.1 degrees? ...
3 votes
3 answers
2k views

How exactly do ICAO's VOR-based minimum separation standards work?

This question is aimed at Air Traffic Controllers who are familiar with ICAO Separation minima. DOC 4444 states the following: Lateral separation between two aircraft exists when: VOR: both ...
6 votes
2 answers
2k views

Are there any ICAO restrictions on naming a taxiway?

According to ICAO are there any certain restrictions to naming a taxiway? For example: a certain letter cannot be used it cannot have letters that match a parking stand etc.
5 votes
1 answer
842 views

What differences are introduced between ICAO Annex 10 volume IV amendment 85 and amendment 89?

What changes have been made to ICAO Annex 10 volume IV (Surveillance Radar and Collision Avoidance Systems) between amendment 85 and amendment 89? I only have access to amendment 89, but I have some ...
2 votes
1 answer
2k views

What are the ICAO RNAV equipment codes for the non-WAAS G1000 and GNS 430W?

When filing an ICAO IFR flight plan, where in "the manual" (which manual?) for a G1000 and a GNS430 do I find the RNAV capability information for an ICAO flight plan? What am I looking for?
3 votes
0 answers
389 views

ACN/PCN Reporting System - Tire Pressure

I have an Airbus A320neo WV054 and I want to operate at a RWY that has PCN 55/R/D/Y/T. Below is my aircraft ACN data as per the Aircraft Characteristics Manual. Looking at the table I can see that my ...
3 votes
2 answers
322 views

Do new VHF radios need to be flight tested?

I'm in the process of upgrading all our VHF radios and the local regulator has asked us to follow the guidance/recommendations from ICAO, as we have more or less cancelled many of our local rules. The ...
2 votes
1 answer
551 views

Why does DME colocated with VOR require more separation?

In earlier versions of ICAO Doc 4444 (Amendment 9 and earlier), two aircraft were deemed to be laterally separated if they were departing a VOR on radials which diverged by at least 15 degrees and if ...
9 votes
2 answers
4k views

How did ICAO SARPS come to include the 250 knots speed limit for aircraft below 10,000 feet?

In certain airspace classes, a speed limit of 250 knots IAS is imposed for aircraft flying below FL100/10.000FT, according to the airspace classes defined by ICAO. How did this limit find its way into ...
6 votes
1 answer
775 views

What are those flight level values on an airway?

I have downloaded from this link the chart of available airways over the Canary Islands. There, in some of the airways, it says FL660 FL145 As far as I know, ...
3 votes
1 answer
2k views

When must ATC give wind variation and gust?

In connection with takeoff and landing, ATC will give the current wind direction and velocity to the pilot. In some cases, ATC will also report the variation in direction and/or current gust (max and ...
9 votes
0 answers
727 views

How can I convert a frozen ATPL from South Africa to an Iranian one?

I have got a frozen ATPL license from South Africa and I'm from Iran. I came back home last year and I have converted my CPL/IR license to the Iranian piloting license by doing Air Law and Human ...
2 votes
1 answer
2k views

What is the minimum runway surface friction coefficient?

After calculating the friction coefficient for an asphalt runway pavement through a test, how to know if it’s acceptable or not? In other words, hat is the lowest acceptable value for friction ...
1 vote
0 answers
214 views

Is there ICAO document that describes MVA criteria?

According Skybrary article the minimum vectoring altitude in each sector provides 1000 ft above the highest obstruction in non-mountainous areas and 2000 ft above the highest obstacle in designated ...
10 votes
2 answers
7k views

What is the maximum interception angle for ILS when on radar vectoring?

Some time ago when I was designing the approach radar module for the ATC simulator for HCAA, the spec was very clear that the limit had to be placed at 45 degrees. So I took it for granted and I didn'...
2 votes
0 answers
112 views

Is the longitudinal extremity of an obstacle limitation surface based on the threshold or the displaced threshold?

In a case where a displaced threshold (DTHR) is present, should the longitudinal extremity of the obstacle limitation surfaces (for example, the conical surfaces) be counted from the threshold (THR) ...
1 vote
2 answers
104 views

How do designers determine the altitude profiles of neighboring procedures for deconfliction purposes?

I am interested in studying ICAO's Continuous Climb Operations design strategy, however I have some trouble understanding how the procedure designers take into consideration the traffic flow from ...
7 votes
1 answer
214 views

Why should lower limit of a Control Area (above 3000 ft) coincide with a VFR cruising level?

In ICAO Annex 11 it is recommended: When the lower limit of a Control Area is above 900 m (3000 ft) MSL it should coincide with a VFR cruising level Why should it coincide with a VFR cruising level?
14 votes
2 answers
5k views

Why are most helipads in São Paulo blue coated and identified by a "P"?

ICAO Annex 14, Vol II and FAA (AC 5390-2C) standards establishes 'H' and there is no mention to coating TLOF or FATO. Brazilian National Regulation (RBAC 155 - ANAC) does not provide any guideline for ...
1 vote
1 answer
263 views

Where can we use conditional clearance?

Besides Line up conditional clearance in a PREPARATION FOR TAKE-OFF situation, where else can we use conditional clearance (on an apron, taxiway, etc.)?
16 votes
6 answers
22k views

Are "Tally-ho" and "no joy" acceptable ATC terms for civil operations?

I keep meaning to ask this question. I heard "Tally-ho" used for the first time by a pilot on Liveatc.net. I know these are pretty standard phrases in military aviation but I wondered if civil pilots ...
12 votes
1 answer
352 views

Do companies based in non-English-speaking countries require intra-cockpit procedural communication to be performed in English?

I was watching a video of an MD-11 landing in Quito, Ecuador The crew is German (Lufthansa). When they speak with ATC it's in English (obviously). When they speak with each other it's in German (...
0 votes
1 answer
75 views

Is there standard ticket data format specification for commercial flight operators? [closed]

I am new to this group and what brings me here is I am doing a research on ticketing solutions for commercial airlines. So I just wanted to find out if there's a international standard specification ...
2 votes
1 answer
341 views

For a coded departure procedure (SID), Fly-At-Altitude or At-Waypoint instruction has priority in case of conflict?

I am examining various RNAV departure procedures and especially those whose purpose is to overlay the existing conventional ones. I noticed that some of them begin with a "Flight at Altitude" ...
4 votes
1 answer
261 views

In a flight plan, does it make any difference to write an increase of the flight level instead of writing a cruise climb?

According to ICAO 4444, a change of speed or level should be written in item 15 of the flight plan according to these rules: Change of speed or level (maximum 21 characters) The point at which a ...
0 votes
2 answers
344 views

What does "1%" mean in ICAO Annex 14 § 3.9.9 (longitudinal slope changes)?

— 1 per cent per 30 m (minimum radius of curvature of 3 000 m) where the code letter is C, D, E or F; and — 1 per cent per 25 m (minimum radius of curvature of 2 500 m) where the code letter is A or ...
26 votes
1 answer
3k views

Why is it runway "1" instead of "01" in America?

In the case of a runway with a magnetic heading of 10° in America the runway number ("1") isn't hugely distinguishable from the runway centreline IMHO, (for example see Washington Airport and San ...
2 votes
1 answer
375 views

What are the procedures for flight checking a glideslope and localizer?

What are the FAA and ICAO requirements and procedures for flight checks and calibration of glideslope and localizer transmitters? I'm interested in both the engineering and piloting aspects.
2 votes
1 answer
3k views

What is the requirement for fire fighting equipment on board a passenger flight?

What is the legal requirement regarding fire fighting equipment on a passenger flight, e.g. fire extinguishers and fire hoods? I imagine that the number is proportional to the airplane's max capacity. ...
0 votes
1 answer
631 views

Are Transponder Mode A and C still in use?

Are the ATC transponder Mode A and Mode C still in use (according to ICAO or FAA rules)?
2 votes
2 answers
2k views

What is the proper ICAO phraseology to activate a flight plan?

OK, so you have a flight plan filed (over internet, phone, company or however), go to the aircraft and get in the cockpit. So you call the controller and request IFR or VFR as appropriate. What is ...
2 votes
1 answer
1k views

How can I calculate the Obstacle Free Zone of an aerodrome?

How can I calculate the Obstacle Free Zone of an aerodrome?
2 votes
1 answer
146 views

How do flight procedure designers decide when to assign an altitude constraint to a waypoint?

I am studying procedure design manuals (TERPS, PBN 8260.58A manual, ICAO PANS-OPS 8168 manual etc.) and I haven't found any guidelines concerning altitude constraints that can be imposed on a waypoint....
1 vote
0 answers
229 views

Is airport's magnetic variation value used for terminal procedure design?

I am studying how instrument flight procedures are coded to ARINC-424 format, and since I was curious about the method used to determine the outbound/inbound magnetic courses, I checked the section ...
2 votes
2 answers
857 views

Does ICAO allow continued flight in RVSM airspace after a transponder failure?

If a civil aircraft's transponder fails in RVSM airspace, can it still be allowed to fly in RVSM according to ICAO? And could it be allowed to fly in class A airspace, according to ICAO?
2 votes
1 answer
62 views

What additional US-power or ICAO requirements apply to a departing US-based crew with a US-registered aircraft flying to land in Mexico?

What are additional requirements (equipment, licenses, identification, etc.) for a flight operation with a US-based aircraft and crew leaving the US to enter and land in Mexico that are imposed on the ...
57 votes
4 answers
47k views

What programming languages are used for equipment onboard aircraft?

Generally speaking, What programming language is used in aviation for (ATC Radio, Radar, ILS, Auto-pilot and on-board avionics)? Is there a standard enforced by ICAO? Does every plane manufacturer ...
5 votes
1 answer
1k views

How do I include a STAR in an ICAO flight plan?

Would it be in accordance with ICAO norms to include a STAR identification right after the airway name in the field 15 of the flight plan? Or should the connecting point between the airway and the ...
16 votes
3 answers
7k views

What is the correct phraseology for declaring a fuel emergency?

If I am pilot, approaching my destination airport and realise that, after landing I will have less than 30 minutes of fuel remaining, how exactly should I express this when communicating with ATC? ...
6 votes
1 answer
768 views

What does "zero offset between two waypoints" mean in ICAO Doc 4444?

My question is with reference to the GNSS based separation specified in ICAO Doc 4444. Could someone explain the significance/meaning of the condition "zero offset between two waypoints" criteria? if ...
6 votes
1 answer
792 views

Can two opposite localizers to a single runway be on simultaneously?

In case of a single runway with two separate ILS systems (one in each end, facing localizers) operating on two different frequencies, can both localizers be on and transmitting at the same time, or ...
7 votes
1 answer
676 views

Is it possible to split a NOTAM in two messages in case it is too long to fit in a single message?

Would it be in accordance with ICAO norms to issue two different NOTAMs with the same year, series and number regarding the same subject and informing //PART 1 OF 2 PARTS// and //PART 2 OF 2 PARTS// ...
4 votes
1 answer
469 views

What is the meaning of "pass well clear" in the ICAO right of way rules?

ICAO Annex 2 states under 3.2.2.1: An aircraft that is obliged by the following rules to keep out of the way of another shall avoid passing over, under or in front of the other, unless it ...
1 vote
3 answers
225 views

Can a controller be tasked to provide more than one ATC service at a time?

During a visit to one of the ATC Facility I found out that the Aerodrome Controller was also providing procedural approach control service along with aerodrome control service. Similarly, Area Radar ...
3 votes
2 answers
2k views

When would a pilot request a "VMC descent" or "VMC climb"?

Can anybody explain what's the point of this and in what kind of situations a pilot needs it? ICAO Doc 9432 "Manual of Radiotelephony" 8.3.3 An aircraft may request a clearance to climb or ...
0 votes
1 answer
1k views

Does in-flight Wi-Fi require regulatory approval?

Does any country have regulations that require a certificate or approval of the aircraft that use portable Wi-Fi in flight? Is there an FAA or EASA regulation or advisory, or an ICAO document or ...
4 votes
1 answer
307 views

Does the ICAO definition of an "aircraft" include a minimum altitude capability?

The German air law includes in their legal definition of a "Luftfahrzeug", which is the equivalent of an aircraft, other devices intended to operate in the airspace if they are capable of being ...
19 votes
2 answers
5k views

When replying to ATC, callsign first or last? [duplicate]

When I was in flight school, some instructor told me that it is the unknown ICAO standard that you should reply to an ATC call with your callsign first, like this: ...
1 vote
0 answers
193 views

Which American State Aircraft use the RVSM exemption?

Reading about RVSM, I noted the exemption for "state aircraft." This is summarize in wikipedia as "State aircraft", which includes aircraft used in military, customs and police service, are ...