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Questions tagged [air-traffic-control]

Air Traffic Control (ATC) is a service of ground-based controllers that directs and coordinates aircraft to improve safety and efficiency.

19
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2answers
4k views

Should you blow through the final approach course if the ATC forgot about you? [duplicate]

So you were being vectored for the final approach course (ILS/RNAV/whatever) and the controller forgot about you for some reason (busy). Assume you called them and they were not replying. Also assume ...
4
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1answer
87 views

What is the difference between a ground controller and an air traffic controller? [duplicate]

In terms of their roles at an airport. I'm designing a system that would inform its users if there is space on the runway that a pilot could use to land or take off, when there is an obstacle on the ...
5
votes
1answer
119 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
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1answer
221 views

How can I find the communication with ATC following an aborted landing?

On February 7th, I was on a UA 4694 from DEN to SAF, upon approach the landing was aborted; upon second approach, we heard the landing gear come down, which we did not hear on the first approach; the ...
2
votes
1answer
122 views

Is altitude and heading your discretion when you are cleared visual approach?

If I'm north of KSAN heading east and the controller clears me for the visual approach for runway 27, can I descend and turn the plane at my discretion so that I can get ready for landing? Also, ...
2
votes
1answer
199 views

What phraseology does ATC use with jet fighter pilots? [closed]

What do they usually say or ask when the fighter pilot wants to take off, when it's in the air, and what is the reply from the fighter pilot?
3
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2answers
212 views

How do I translate this propeller start procedure into English?

I'm translating a documentary from Hungarian to English. There is a scene where the pilot of an aeroplane with a propeller is preparing for take-off. He says (seemingly into a 2-way radio) two short ...
0
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0answers
72 views

pre-departure sequence, how to increase number of flights in the sequence

If I have number of flights ready to depart (valid TOBT) if I want to increase the number of flights in the queue by adding flights in the gaps between any 2 flights whats the minimum seperation that ...
4
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0answers
89 views

What are the helicopter frequencies on the LA heli charts used for?

The LA heli charts list frequencies for the different heli routes in LA: Are the frequencies used as a "CTAF" for helicopters, or is there an air traffic controller on that frequency telling ...
1
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3answers
181 views

ATC calling out regional airlines in traffic advisories: phoenetic or “aircraft paint” airline used?

When ATC points out traffic that is a regional airline (e.g. Compass, Envoy, SkyWest, etc.), do they use the phonetic callsign of the airline, or do they use the callsign of the airline that they are ...
6
votes
1answer
225 views

Who manages air traffic during Red Bull air races?

I'll preface this by saying I'm not a pilot so I don't know much about Air Traffic Control. How does Air Traffic Control work for Red Bull air races? Does: (1) each plane taking off need to contact ...
1
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3answers
149 views

Phoenix Area Helicopter ATC: What is “Hee-lah” (Gila?) One, and what is the 101 transition?

I've been listening to the Phoenix Tower LiveATC feed, and I hear references to "Hee-lah" (Gila?) One and the 101 transition with helicopters (see audio files below): Angel-Five TV-3 TV-15 Does ...
6
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1answer
152 views

Why would ATC issue a takeoff clearance and also tell the same aircraft to maintain visual separation at the same time?

I heard this from the Phoenix Sky Harbor airport tower years ago on a sunny and hot day. Is it because the controller is able to take off aircraft more quickly by putting the responsibility on pilots ...
6
votes
1answer
620 views

What does “<aircraft type> X miles in trail, runway 25R cleared to land” mean?

I was listening to the LiveATC Phoenix North Tower feed as he was clearing aircraft to land. He said something like "Southwest fifteen sixty five, Phoenix Tower, (aircraft type), X miles in trail, ...
6
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1answer
363 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 ...
1
vote
2answers
168 views

When is 'heavy' used in callsign?

I have heared at ATC communication that some aircraft uses a heavy word in the call sign. What does heavy means? When it is used? Is it used when aircraft is heavier than 200-300 tons?
6
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4answers
426 views

Why do heavy departures wait 5-10 minutes on the runway at ZRH?

I'm frequently travelling to Zürich for business and I usually make my schedule so that I have at least an hour to do some planespotting and photographing at the ZRH airport. Whenever I came to the ...
3
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0answers
48 views

Where can I find US ARTCC sector boundary coordinates?

For an academic purpose, I would like to map US airspace using GIS tools with coordinates. I found the airspace boundary coordinates from the eNASR, but no luck with the sector boundaries. Any ...
2
votes
1answer
56 views

Which pilot (pilot flying, pilot monitoring) handles CPDLC (operates CPDLC interface)?

This question relates to commercial flights, typical two-pilot crew: In some airspaces, e.g. North Atlantic, pilots and Air Traffic Control use Controller Pilot Data Link Communication (CPDLC, ...
2
votes
3answers
204 views

How could so many drones establish contact with ATC?

India has brought out best set of drone regulations on the basis of No Permission No Take-off (NPNT). But how can the ATC establish contact with so many drones that will be unpredictably asking for ...
1
vote
2answers
151 views

Does ATC use True Course or Ground Track?

Reading the practice questions for PAR, I came accross this ATC advises, "traffic 12 o`clock." This advisory is relative to your A) true course B) ground track C) magnetic heading I was ...
0
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0answers
130 views

How much does it cost the airline if an aircraft makes a missed approach? [duplicate]

aircraft go around due to variety of reasons viz. Bad weather (inevitable), unstable approach, ATC errors etc. knowing the cost implications will help in educating the stakeholders.
4
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1answer
766 views

What steps are needed to communicate with ATC on an A320?

In the description to this video, Captain Joe says that it took this inexperienced person 20 minutes to establish radio contact with ATC (in an A320 simulator). This seems like an awful lot of time ...
3
votes
1answer
104 views

Why doesn't a radar-equipped Tower say “radar contact”?

Most/all of the control towers in my area have radar displays, and I know from visits that it shows all the same things as in TRACON miles away--even aircraft on the ground. I hear them occasionally ...
2
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2answers
123 views

Why are waypoints not named uniquely?

Waypoint names are not unique. Why ? This is unnecessary (it would be possible to use unique names only). It introduces potential for confusion. So why are duplicate waypoint names permissible and ...
0
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2answers
129 views

If all aircraft were TCAS-equipped, how would this change ATC routines?

« The primary purpose of ATC worldwide is to prevent collisions, organize and expedite the flow of air traffic, and provide information and other support for pilots. » (source) If all aircraft ...
2
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2answers
153 views

Why are both ATC and TCAS tasked to prevent collisions although TCAS takes precedence anyway?

« The primary purpose of ATC worldwide is to prevent collisions [...] Many aircraft also have collision avoidance systems, which provide additional safety by warning pilots when other aircraft get ...
0
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1answer
108 views

What’s service does ATC service include?

As I’ve studied on ATC service and airspace class by referring to ICAO Annex, I have some doubts on ATC service. According to ICAO Annex 11, Class D airspace is defined as “IFR and VFR flights are ...
6
votes
3answers
342 views

Can pilots choose runway and landing direction?

Pilots normally receive landing clearance for a specific runway assigned by ATC. Absent an emergency, can pilots of commercial flights (depending on the wind conditions for example) choose a ...
-1
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1answer
69 views

When flying commercial a/c form US to Latin America by GPS which agency controls the flight? [duplicate]

When flying internationally from the US to Latin America, the use of GPS is common. What agency or agencies control the flight and how?
3
votes
4answers
598 views

What would happen if I exceeded mach 1 over a regulated area?

What would happen if I exceeded mach 1 over a regulated area? Are there any penalties in place for this violation? Would ATC actually know I’m flying supersonic or would they have to go out of ...
6
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3answers
224 views

Can ATC terminate flight following AND approve (arbitrary) frequency change while still inside Class C airspace?

Unusual (for me) event inside Class C. Can ATC terminate flight following inside Class C and approve frequency change. Background: Requested and received VFR FF at 6500 msl prior to approaching ONT ...
3
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4answers
108 views

Will Tower repeat an initial heading if it's part of my IFR clearance?

If I get an initial heading to fly in my clearance from Clearance Delivery, but the Tower controller does not repeat the heading to fly in my takeoff clearance and I stay on runway heading, can the ...
4
votes
1answer
286 views

Heard on LiveATC that ATC wants to “cancel” something. What did the ATC mean by that?

Just heard this on LiveATC: ATC has cleared the pilot for an ILS approach ATC then said something to the pilot, to which the pilot replied, "Roger, will cancel with you on the ground, call sign." ...
1
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2answers
439 views

How unusual were MH370's final ATC exchanges?

There are 2 noteworthy occurrences in the ATC radio transcript within just minutes of a 3rd noteworthy, quite unprecedented occurrence in aviation history: At 01:07:55 MH370 unnecessarily reported ...
0
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1answer
67 views

Restore air traffic controllers' instructions from aircraft tracks

Is it possible to understand what commands had been given to an aircraft if you look at its track containing information about lat, lon, altitude, speed and course? Is there anyone who has already ...
3
votes
2answers
181 views

What emergencies or failures should I report to ATC? [duplicate]

During a flight, what kinds of emergencies or failures should I report to ATC immediately? For what kind of emergencies or failures am I not required to report them? What is the general rule? Could I ...
4
votes
2answers
435 views

On a flight with short stops, do you terminate flight following at each stop?

On a cross-country trip, is it normal to terminate FF at each stop and reacquire it (potentially just a few minutes later) for the next leg, or would ATC prefer that you advise them it'll be a short ...
2
votes
2answers
158 views

Is the whole world's airspace covered by ATC? [closed]

I'm an enthusiast and have only flown flight/atc simulators (on the VATSIM network). Obviously sometimes the airspace you are flying in is not covered by any ATC (so I have to set my frequency to ...
43
votes
4answers
6k views

Can ATC handle a flight as emergency although the pilots have not declared an emergency?

The preliminary report for the LNI610 crash shows how much distractive conversation there was between ATC and LIN610 at a time when the pilots clearly didn't have the aircraft under control – as ...
0
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2answers
203 views

How long can ATC operate for without main power? [closed]

This question pertains to large towers at large airports. I'm assuming there is backup power in case of a power cut / power failure. But how long does a typical reserve generator / unit supply power ...
3
votes
5answers
363 views

Why can’t air traffic control radars determine the altitudes of primary targets?

There are two types of returns that show up on an air traffic controller’s radar screen: Secondary returns are not, strictly-speaking, radar “returns” at all, but, rather, signals automatically ...
8
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3answers
2k views

Are there any publically available recordings of conversations between ATC and pilots?

It can be either audio or transcription. It would be perfect if it also contains aircraft tracks.
3
votes
1answer
208 views

When flying in uncontrolled airspace, which ATC frequency should I contact if I have an emergency?

Question 1: If I am flying in uncontrolled airspace and I have an emergency, should I report on 121.5MHz if no ATC is within line of sight communication (which means I cannot hear the ATC and the ATC ...
2
votes
2answers
1k views

Please explain real-world procedures behind this “ATC joke”

One of the well-known kind of the "ATC jokes" (funny excerpts from real or invented communication between pilots and air traffic controllers) has recently caught my eye. I can't seem to understand ...
3
votes
3answers
228 views

When an emergency happens, why do pilots need to stay on the current ATC frequency?

Per the below order, I need to stay with the initial ATC frequency during an emergency, what is the benefit to do so? What if the aircraft entered into the airspace controlled by anther ATC or the ...
0
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0answers
108 views

What is DPI? How is it Useful? And How does it work?

I have heard of DPI (departure planning information) status for a flight. I wanted to know what is this Status for? How is it computed or determined? What are the different status for it if any and ...
3
votes
1answer
217 views

What if the tower Is obstructed by clouds?

I know towers use radar to watch aircraft, obviously. But what about ground controllers? What if their view is obstructed by a low cloud level/fog? Is there such a thing as ground-based traffic ...
2
votes
1answer
62 views

Does a subsequent crossing restriction supersede earlier crossing restrictions?

Does a subsequent crossing restriction supersede earlier crossing restrictions? Here's an example. While flying the MIP4 arrival into KLGA, you receive the expected instruction to cross MARRC at ...
1
vote
1answer
193 views

Can paragliders communicate with ATC?

I am a private pilot looking to get into paragliding. After talking to some of my friends who do paragliding in the SF bay area and watching youtube videos. I noticed some fly through places like ...