Ok thanks a lot.

 

1) Basically, it will remain with it's last HDG, PITCH and SPEED as there is nothing managed anymore.

So you need to put the LOC by yourself or else it won't align. This is not a function of the autopilot.

When you press LOC, it stops to manage HDG and ALT/ VS. So we only enter the frequency and the course of the runway for an LOC to be tuned with the correct one. When you press LOC button, it will start searching which is our correct LOC and will align us with the runway. It will intercept the Glide slope. But once on the glideslope, it considers it as Autopilot. Am I right?

 

2) What is the vertical guidance for a RNAV APPROACH?

 

Thanks

AF330, I do really want to help you, however your understanding is very basic. Once again, you must learn to crawl before you walk & then run.  You don't seem to understand the true meaning of SELECTED or MANAGED 

 

 

 

Basically, it will remain with it's last HDG, PITCH and SPEED as there is nothing managed anymore.

 

If you are flying the aircraft Managed (or even selected on runway heading) then it will still follow runway heading. Managed or Selected has nothing to do with the localizer signal, you just make sure you are on a intercept course before pushing LOC. So, you are in control either SELECTED,MANGED, Or hand flying.

 

 

 

 

This is not a function of the autopilot

 

You manually tell the aircraft to intercept (Push LOC or APPR) If on Autopilot it will attempt to intercept when near the LOC signal, it will even try if you don't put the aircraft on a good intercept angle.  You see this a lot on flightsim videos

 

 

 

When you press LOC, it stops to manage HDG and ALT/ VS

 

No, it will go to LOC* that means it is armed and ready to lock onto the signal when near to intercept. You remain in SELECTED or MANAGED

 

 

 

When you press LOC button, it will start searching which is our correct LOC and will align us with the runway. 

 

It will be armed and waiting for the LOC & G/S signal to be close enough to lock. While it is in that mode it is called LOC* or G/S *  (STAR)  Depending on what you pushed on the FCU (LOC or APPR)

 

 

 

It will intercept the Glide slope. But once on the glideslope, it considers it as Autopilot. Am I right?

 

No! not if you only pressed LOC.  I don't understand what you mean by 'it considers it as Autopilot'    You are getting ahead of yourself and it seems like you do not really understand how the Autopilot works.  You can intercept and follow the LOC & GS with no autopilot involvement.

 

 

Let's not get started on RNAV

Thanks,

You have answered my question. You basically press the LOC button to get the glideslope and confirm that you want to land. If you don't push the LOC button, in managed mode, the plane will still align you with the runway but you won't descend at all . You will simply be aligned. But if you push LOC, you confirm that you want to descend and that you want to be aligned. So if you simply want to be aligned with the runway, just enter the approach you want in the FMS and the frequency to be sure to be on the right LOC.

 

Am I right this time??

 

Thanks a lot

No LOC and APPR are completely separate.  LOC connects you to the localizer, APPR connects you to the Localizer and Glide slope. 

 

 

 

If you don't push the LOC button in managed mode, the plane will still align you with the runway but you won't descend at all

 

Yes the aircraft will align  (where it thinks the runway is) in managed mode if you have entered the  runway as part of your flight plan. It creates a runway track. 

 

 

 

But if you push LOC, you confirm that you want to descend and that you want to be aligned

 

No, once again.. Localizer is lateral guidance, Glide slope is vertical guidance. You must Push APPR (APPROACH) to have both. 

Ok thanks a lot.

But when we select our type of approach we want and our runway, doesn't it plan the the FAF for us? If not, I would understand the use to have the LOC button!

Check this please: http://www.efbdesktop.com/nav-flight-management/sys-14.8.10.html

Does the plane know my FAF just by selecting my ILS? Of course, just the course not the glideslope

Am off out shortly so last post my friend  Yes it will plan the FAF and give you the runway track to fly.  The purpose of the LOC button is to purely fly the Localizer raw data (Have a external signal guide you in)

 

All the magic and accuracy in the FMGS/FMC is based on accurate data from the GPS/IRS onboard.   This can be wrong for a number of reasons.  The aircraft itself tells you how accurate it is and uses ground based signals to update.

 

Very basic example - 

 

 the IRS can be wrong, you are actually half a mile left of the runway centerline. The IRS thinks you are bang on center and shows you heading straight for the runway on your nice NAV and PFD display. This is called IRS drift, Not nice when surrounded by mountains, this also gets into RNAV accuracy, a whole different story.  

 

When you hit the LOC button you are actually picking up the runway centerline signal, not just allowing the onboard computers to guess where the runway is based on information you preprogrammed  & satellites

 

Regarding your picture. Once the runway is selected the FMGS will build an extended centerline.  This can still be wrong 

But when we select our type of approach we want and our runway, doesn't it plan the the FAF for us?

Your big mistake is that having almost zero knowledge about the subject matter you jump straight to a big sophisticated jet with FMS, etc

and try to fly ILS. You should first find a small airplane (Cessna/Piper, etc) with autopilot but no FMS, and learn to fly ILS with it, you should

even try an ILS with no help from autopilot, with autopilot turned OFF. This would teach you basics and you wouldn't be asking questions

that don't even make sense.

 

 

...and you wouldn't be asking questions that don't even make sense.

 

"A little learning is a dangerous thing"

Thanks a lot FLEX1978,

 

Just to confirm what I have understood, I just would like to check what I have understood.

Check this: http://www.ahrtp.com/OnlinePubs/AF-447_pitot_static/A330_Probes_Location_0.75x_F-GZCP_2009-06.jpg

 

So we communicate with the different VOR, NDB... with SATCOM and with the tower using VHF.

So I will take a very silly example. 

 

You are in an A330/320 and the FCU is showing this:

ALT- 3000 managed.

HDG- managed 

 

You are on a glideslope with LOC and APPR on but you want to change the runway. You turn off the LOC BUTTON and the APPR one. The plane will then climb to 3000ft with the HDG of the runway you were landing. At 3000ft, you change your runway in the FMS and you enter in the FMS the LOC/ILS frequency.

The plane will then automatically take you to that runway. You don't need LOC because it will align you but as it will simply be using SATCOM, it won't be as precise. So you will put the LOC on, and as there are 2 LOC receivers, you will have more precession. But you won't be descending, you will have to press the APPR button, so that the LOC sends you the glideslope and the the localizer's signal.

You then can land automatically if you are in CAT III and if you have the glideslope signals till the end.

 

Ouf! Am I right this time?? 

Mate  I don't even know where to begin.  You are kind of getting it, but also  wrong on so many levels.  Please  :Praying:   Learn the basics first and focus on the default Cessna, then come back and read what I posted previously, everything will make a lot more sense.

 

You get 10 out of 10 for effort, at 14 all I was thinking about was girls & supercars :/    I will send you some info to get yourself started, that is  if you do actually want to study the aircraft properly.  

 

Regarding the scenario you described - Basically you would need to fly a missed approach, I'm not going into details because you have various methods of performing a missed approach depending on if the aircraft is above or below the missed approach altitude.

 

 

 

Regards

Ok thanks,

But I think that I should first learn these, my last questions:

 

1) What is SATCOM?

2) What is the use to have the VHF antennas?

3) How does the VOR/NDB communicate with an aircraft?

4) How does the Tower communicate with the plane?

5) How do the IRS/GPS find our position?

6) How does the tower find our position? Transponder?

 

Basically I don't want to know how does a VOR work or anything like this but I am more interested in the way the signals go. For example, a VOR will keep giving it's signal. But does it give it to the plane directly?

Or does it go to the satellites first and then to the plane?

 

If anyone can answer these, it would we very useful for me.`

 

Thanks a lot

The VOR (VHF omnidirectional range) sends it signal directly to any aircraft, that's the idea of radio navigation, as opposed to satellite based GPS navigation. The key thing is that aircraft need to 1) be within the range of the VOR, 2) have the VOR freq tuned in on the radio and I believe also 3) have a (theoretical) visual contact to it (i.e. not obstructed by mountains or similar things), but I'm not entirely sure on that.

So you already see a reason for the VHF antennas. The other obvious reason for having these antennas is that the aircrat need to be in contanct with the various controllers, e.g. tower controllers. This is also done via VHF radios, but on a different frequency band than VORs.

 

As for NDBs: They work in a similar way as VORs, and yet they don't; they also send a signal directly to the aircraft, but on a different (lower) frequency, and without the possibility to track a certain radial.

Thanks a lot,

 

1) So the VOR antenna sends it's frequency everywhere, right?

2) So the plane, if we are on an airway, will capture it when it WHEN WE WILL BE ON THE COURSE WE WANT, right?

3) What is the use to have the SATCOM?

4) How does the tower detect our position?

5) How does the IRS detect our position?

 

Thanks a lot

Ok, as long as these are your last questions! :-) As mentioned I will try and send you a bunch of docs to read after the weekend.

 

 

 

1) So the VOR antenna sends it's frequency everywhere, right?

 

Yeah, it broadcasts within a certain range...  Your question was answered above.

 

2) So the plane, if we are on an airway, will capture it when it WHEN WE WILL BE ON THE COURSE WE WANT, right?

 

don't have a clue as to what you are trying to say :/

 

3) What is the use to have the SATCOM?   

 

Satellite communication.. Here's a link    http://www.arinc.com/sectors/aviation/aircraft_operations/commercial_aviation/voice_data_comm/air_ground_data/inmarsat_satellite_services.html

 

4) How does the tower detect our position?

 

Here's another link! http://airtrafficatlanta.com/radar.html

 

5) How does the IRS detect our position?

 

You align the IRS when the aircraft is stationary on the ground,    Some info below..

 

Aircraft are  fitted with Inertial reference Units, or IRUs, which double integrate sensed accelerations over time to determine the aircraft position relative to the starting position. It is for this reason that parking bays have coordinates, so that the IRU can be “told” what its initial position is, before the aircraft is moved. However since this is a unit that works purely on dead reckoning, the errors accumulate over time, unless the position is updated on a periodical basis. And this is where the FMS come in, as the guardian of navigation integrity.

You are on a glideslope with LOC and APPR on but you want to change the runway. You turn off the LOC BUTTON and the APPR one. The plane will then climb to 3000ft with the HDG of the runway you were landing. At 3000ft, you change your runway in the FMS and you enter in the FMS the LOC/ILS frequency.

The plane will then automatically take you to that runway. You don't need LOC because it will align you but as it will simply be using SATCOM, it won't be as precise. So you will put the LOC on, and as there are 2 LOC receivers, you will have more precession. But you won't be descending, you will have to press the APPR button, so that the LOC sends you the glideslope and the the localizer's signal.

You then can land automatically if you are in CAT III and if you have the glideslope signals till the end.

It is hard to decide whether to cry or laugh.

I don't want to put you down because you are clearly making some effort but your statements like "I don't want to know how VOR works" show contempt for what is an essential pilot's knowledge. Unless you break this pattern and actually start from basics, from some textbooks which cost little or nothing (which are also careful not to shove unnecessary info down your throat) , etc I see very little chance you will ever complete a single half-decent flight. And I repeat - you should park this A330 for now and start from something a lot simpler.