![]() You probably will already have one 'CMD' button pressed, since your autopilot was tracking the localiser and lining you up, but if your simulated aircraft has more than one autopilot simulated (i.e. So you will fly up into the glideslope beam as you get nearer to the runway (the reason you should fly up into the glideslope signal from underneath it, is again because bounced signals can send a false glideslope beam out above the real beam and confuse an autopilot, but again, that's in the real world, not in FS).When you get near being directly underneath the beam (as indicated on your cockpit gauges), you should hit the autopilot approach mode button (usually labeled 'APP') and also turn on all of your autopilot command buttons (these are usually labeled 'CMD'). That's why it is usually worth looking at an approach chart to find out the correct height for any particular ILS interception.When you are lined up with the localiser, maybe ten or twelve miles out and heading toward the runway, you will be flying toward the runway underneath the extended glideslope signal beam, which is of course a focused beam that is transmitting up and out from the runway. Generally speaking, glideslopes are at a slope downwards of around three degrees, but some airports (for example London City) have much steeper glideslopes (six degrees or so) in order to avoid tall buildings in the London Docklands, which means if you come at that one too low, your autopilot might have a hard time transitioning neatly from straight and level flight into an approach descent. However, if you come in too low under the beam, you'll be late in going into a descent down the beam, so that could possibly have had a bearing on why you were having problems. MHz, respectively, for the glide paths, both being first adjacentĬhannels (300 kHz spacing) to the Sequence Number 2 glide pathĬhannel.Basically what you are supposed to do is fly into the localiser beam whilst at perhaps 3,000 or so feet above the terrain (could be less, or even more, so 2,200 feet is probably okay), normally, an approach chart would actually tell you the correct height to be at.In reality, going too low can fool your autopilot into picking up on false or diminished signals from the ground clutter, which might make your autopilot lock onto a false glideslope signal or lose track of it, but FS does not model that phenomenon, so 2,200 feet is fine so long as you are clear of terrain. The case of the localizers, assign frequencies of 334.1 MHz and 333.5 Sequence Numbers 12 and 19, however,Īlthough providing wide frequency separation from Sequence Number 2 in Sequence Number 2 pairs the localizer frequency of 109.9 MHz with The second ten sequence pairings, it may be necessary to selectĬertain pairings out of sequence in order to meet the minimumĮxample: Referring to Chapter 3, 3.1.6.1.1, it will be noted that ILS Where it is necessary to make assignments in both the first ten and That, provided they are met for the localizer element, the glide pathĮlement is automatically covered. Selected sequentially, as required, from the following list:Īttachment C of Annex 10, ( 2.6 Deployment of ILS frequencies) provides some details about this selection:Ģ.6.5 In general, when international use of ILS systems is confined to the pairings listed in Chapter 3, 3.1.6.1.1, the criteria are such Landing system do not justify more than 20 pairs, they shall be Localizer and glide path transmitter frequencies of an instrument Pairing was carefully designed so that ILS could work without interferences ( harmonic and heterodyne) in certain conditions without being below the radio horizon of each other.Ī preferred pairing table is provided for such use:ģ.1.6.1.1 In those regions where the requirements for runway ![]() The pairing table was built back in 1956! (Fifth Session of the COM It's ITU which is responsible for the global (civil) use of the frequency spectrum. ICAO decisions in radiocommunication matters are subject to the frequency allotment and protection decisions taken under the auspices of the ITU during the World Radiocommunication Conference (WRC), held every four years. The localizer / glide path pairing table is part of Annex 10 of the Convention, Volume I, paragraph 3.1.6.ģ.1.6.1 The pairing of the runway localizer and glide path transmitterįrequencies of an instrument landing system shall be taken from theįollowing list in accordance with the provisions of Volume V, Chapter For aviation, the international body is ICAO and ICAO Chicago Convention is the main framework used to ensure international aviation operations are possible, safe and fair: However this local decision happens after an agreement already found in international bodies. ![]() As always the country is responsible for the final decision, so FAA/FCC will decide in the US (but see 's comment from an insider below), and I believe so does the MIC in Japan.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |