A DME arc is just another type of transition to an approach and like all transitions, they have to be started at an IAF.
AIRPORTS WITH LOCALIZER BACK COURSE APPROACH PLUS
They can be a bit challenging to track with only one VOR receiver and DME, but it gets easier with two VORs plus DME, and it becomes a no brainer with gps.Īn airline pilot may wish to comment on this because they fly only IFR and would know more about real world practices but I think if you are cleared to intercept a particular DME arc by a controller then you may do so, and you do not have to fly to one of the two llustrated IAFs on the arc if you have the clearance.ATC will clear you to a fix.ĪTC cannot just let someone fly where they want, they need to ensure terrain clearance and separation. This saves time and makes the approach more efficient because you have an almost unlimited number of initial approach fixes. The nice thing about DME arcs is that they can be intercepted at any angle. Older Bendix Kings and S-Tecs are what I have in mind, but I think they all need to be set for back course localizer even on the G1000/ GFC700 autopilots. Just make sure you engage the "BC" button the autopilot, if you are using one that does not know which way the approach is being flown front or back. BC approaches makes two approaches from one localizer, saving the taxpayer some money. BC approaches are simply the opposite side of a typical localizer. DME arcs are often used with back course approaches. They once were only VOR-based but now GPS has them. That's what is so cool about the HSI.Can someone please explain me about DME arc, and localizer back course approaches?Your best bet is to read up on them in your Jeppeson Instrument/ Commercial textbook or Instrument Flying Handbook (FAA).ĭME arcs are drawn at certain distances around VORs and occasionally other navaids, to serve as a flexible IAF to an approach. >On a Back Course approach, the HSI needle will move OPPOSITE what you should fly if the HSI needle moves RIGHT, you'd need to fly LEFT.Īctually, if you are using an HSI, one of the main advantages of the HSI is the ability to spin the card to the "front course" heading and fly the backcourse just like you would the front course (i.e. However, to correct the prior post, there is no such thing as a "BC ILS", since no glideslope is provided thus you can't have an ILS. >used for the flip-side of a runway (BC/ILS 27). The approaches that employ the backcourse signal are approapriately termed Localizer Backcourse approaches (LOC BC). More times than not, only the front course is used by the FAA or other controlling agency (for either a LOC or ILS approach) however, some airports have designated approaches that utilize this already present backcourse signal. The localizer equipment for either the LOC approach or the ILS approach is typically constructed at the far end of the runway and inherently provides a front course (that lies in front of it) and a back course. The localizer equipment itself that is used for a LOC approach is typically the same as that used for ILSs-provides horizontal navigation. The ILS therefore provides a "precision" approach.Īn approach that does not have a glideslope but has a localizer is called a Localizer Approach (LOC). Technically, you are ~NOT~ flying the backcourse of an ILS, since by definition an Instrument Landing System (ILS) is comprised of both a localizer signal for horizontal navigation and a glideslope for vertical navigation. However, at the risk of annoying others, I hope this serves to give the original poster a bit more of an understanding of BC approaches. I'm reluctant to clarify some of the concepts above, because in essence the question was properly answered (a BC button on the autopilots serves to reverse the control inputs commanded by the autopilot when flying the backcourse of a localizer). >There aren't a lot of BC ILS approaches out there, but there
>fly if the HSI needle moves RIGHT, you'd need to fly LEFT.
>approach, the HSI needle will move OPPOSITE what you should >button translates the reverse ILS indications into the >9)is used for the flip-side of a runway (BC/ILS 27). So, the ILS tramitter for one runway (i.e. >Some ILS aproaches don't have a seperate, dedicated ILS
0 kommentar(er)
