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Anonymous
Anonymous asked in Cars & TransportationAircraft · 1 decade ago

IFR v. VFR?

what is the difference between the two other then Instrument Flight Rule and Visiual FLight Rule? I know that IFR is used in bad weather and by most Jets transporting people, but can u have a IFR and use Airways or do u have to do VOR's. Because when you fly you dont feel yourslefd turn at every VOR you pass, it seems pretty level. Or is it because you file for this and ATC just vectors you on where to go.

Thanks, ya its a long question

7 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    Airways are usually between two VORs and yes they are used for IFR flights as well as an aid to VFR flights.

    But now, with advances in technology, aircraft can plot a straight line between the destinations they want to go using RNAV (area navigation). This compares the directional and distance info from several VORs and gives you a straight course to follow. This is supplemented (and will eventually be replaced) by GPS.

    At normal cruising altitudes these routes exist between major city pairs and at higher altitudes you can fly anywhere you want with a clearance.

    ATC will sometimes vector you off your flight planned route for unexpected traffic, weather, or emergencies.

  • 1 decade ago

    Visual Flight Rules apply when flying under visual meteorological conditions (VMC). VMC is defined in terms of in-flight visibility and clearnace from clouds. You can't fly under Visual Flight Rules if there isn't enough visibility or if you are too close to the clouds. (The distances depend on the type of airspace you're in.)

    Instrument Flight Rules don't really have anything to do with the weather. You can fly under Instrument Flight Rules regardless of the weather. All commercial flights are required to fly under Instrument Flight Rules. Many general aviation and charter flights also fly under these rules.

    One of the main differences between the VFR and IFR regulations is that under IFR you are under direct control of Air Traffic Control (ATC). You must, except for emergencies and other unusual situations, abide by ATC requests and clearances.

    You're right that there are a lot of VORs but commercial flights make very few turns. This is because they fly in Class A airspace and use high altitude jetways instead of the low altitude airways depicted on sectional and low-altitude enroute charts. These jetways are longer and connect points that are farther apart. The VORs that define these jetways operate at higher power so they have more range.

    It's also possible as others have suggested that a commercial flight will get a direct clearance to fly to a distant VOR using GPS or some other navigation system that doesn't require a turn at every VOR along the way.

    Hope this helps.

  • Anonymous
    1 decade ago

    IFR - Most of the time you will be in contact with ATC from the start of your flight to the end of your flight and follow IFR rules, no matter what the weather is at the time. This means that someone will be keeping an eye on you. If you were to lose your radio contact, you would follow set procedures and they would know what you were going to do and when.

    VFR - You can ask for "flight following" but you can't depend on it the same way as under IFR. Also, if the weather gets bad, you're going to have to turn around or land.

    Just trying to keep it simple.

    Source(s): FAA Licensed Dispatcher
  • 1 decade ago

    There are a few basic differences between IFR and VFR:

    VFR requires a certain level of visibility (how far you can see) and you must stay clear of clouds (vertically and horizontally). These criteria change depending upon the class of airspace you are flying.

    Class A - above 18,000 ft

    Visibility - not applicable, cloud clearance not applicable

    Class B (around major airports)

    3 statute miles visibility, remain clear of clouds

    Class C (around most midsized airports)

    3 statute miles visibility, remain 500 ft below clouds, 1000 feet above clouds, or 2000 feet horizontal from clouds

    Class D (around smaller airports with a control tower)

    3 statute miles visibility, remain 500 ft below clouds, 1000 feet above clouds, or 2000 feet horizontal from clouds

    Class E airspace

    Below 10,000 ft above mean sea level

    3 statute miles visibility, remain 500 ft below clouds, 1000 feet above clouds, or 2000 feet horizontal from clouds

    At or above10,000 ft above mean sea level

    5 statute miles visibility, remain 1000 ft below clouds, 1000 feet above clouds, or 1 statute mile horizontal from clouds

    Class G - everywhere that isn't Class A-E has different requirements that vary with altitude and day/night.

    Commercial airliners typically cruise at altitudes between 28K and 40K to get better gas consumption and thus are flying in Class A airspace. If you are flying in Class A airspace, you must fly IFR. The simplified reason is that that you won't necessarily be able to see the ground in sufficient detail to navigate by eye so you need instruments. A typical IFR flight plan covers you from take off point to landing point.

    Class A airspace doesn't use VOR routes, it uses Jet Routes and they do connect points that are farther apart than VORs so there aren't as many turns.

    You can fly IFR in Class B - G airspace and the normal reason for doing that is visiblity/cloud limitations. You may fly the VORs or direct depending on what ATC clearance you were able to obtain. When flying IFR, you are always under ATC control.

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  • 4 years ago

    IFR stands for device Flight regulations, a set of aviation regulations that govern flight utilising gadgets basically (no seen touch). IFR flight is quite complicated and notably regulated, besides the fact that it is quite risk-free whilst performed precise. commercial airline flights are continually IFR, even in clean climate, by using extra risk-free practices. Direct GPS is basically routing that flies quickly from one factor to a different utilising GPS training. Direct GPS could be used for the period of the two IFR (with an approved GPS unit) or VFR flight. maximum IFR routing isn't direct GPS, because of the fact of site visitors concerns. VFR flights can do what they desire, as long because of the fact the flight is performed under seen meteorological circumstances.

  • 1 decade ago

    the difference is when you fly under VFR, you have to stay clear of th clouds. VOR's and Victor airways are just for navigation and can be used for both VFR and IFR. ATC will vector you under both VFR and IFR depending on workload.

  • 1 decade ago

    you just answered your question. Visual flight rules are used when you are able to see visually, but ifr are used when anytime you want to, but usually when its bd weather..

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