LOC only app in the FMGC
Thread Starter
Join Date: Jul 2009
Location: London
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
LOC only app in the FMGC
Guys, what is the advantage of having a LOC only approach in the FMGC rather than just the ils for that runway.
If you fly the loc only you can only fly this with loc/fpa. I can't see any advantage to having a loc only approach rather than just selecting the ILS approach and then if needs be selecting loc only and fpa modes if you need to fly a LOC only approach.
A some airports there is both a LOC approach and an ILS that can be selected in the FMGC for the same runway.
If you fly the loc only you can only fly this with loc/fpa. I can't see any advantage to having a loc only approach rather than just selecting the ILS approach and then if needs be selecting loc only and fpa modes if you need to fly a LOC only approach.
A some airports there is both a LOC approach and an ILS that can be selected in the FMGC for the same runway.
Not all LOC only procedures are identical to the ILS procedures for the same runway.
There might be different platform altitudes, a different descent angle, different MAPs, different minima or maybe different go-arounds, so that information is needed if programming the approach into the FMGC.
There might be different platform altitudes, a different descent angle, different MAPs, different minima or maybe different go-arounds, so that information is needed if programming the approach into the FMGC.
Last edited by Uplinker; 15th Jan 2017 at 17:02.
Join Date: Oct 2007
Location: US
Posts: 72
Likes: 0
Received 0 Likes
on
0 Posts
Guys, what is the advantage of having a LOC only approach in the FMGC rather than just the ils for that runway.
If you fly the loc only you can only fly this with loc/fpa. I can't see any advantage to having a loc only approach rather than just selecting the ILS approach and then if needs be selecting loc only and fpa modes if you need to fly a LOC only approach.
A some airports there is both a LOC approach and an ILS that can be selected in the FMGC for the same runway.
If you fly the loc only you can only fly this with loc/fpa. I can't see any advantage to having a loc only approach rather than just selecting the ILS approach and then if needs be selecting loc only and fpa modes if you need to fly a LOC only approach.
A some airports there is both a LOC approach and an ILS that can be selected in the FMGC for the same runway.
Thread Starter
Join Date: Jul 2009
Location: London
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
Cheers guys,
I can see that the go around if different is useful so we can fly it in managed nav. The predictions for descent arrows and the like would also be incorrect if the box didn't have the correct vertical profile inserted. It might also start at a different platform altitude.
Not sure why the intermediate fix matters too much as you would be flying in FPA?
I can see that the go around if different is useful so we can fly it in managed nav. The predictions for descent arrows and the like would also be incorrect if the box didn't have the correct vertical profile inserted. It might also start at a different platform altitude.
Not sure why the intermediate fix matters too much as you would be flying in FPA?
Join Date: Oct 2007
Location: US
Posts: 72
Likes: 0
Received 0 Likes
on
0 Posts
Cheers guys,
I can see that the go around if different is useful so we can fly it in managed nav. The predictions for descent arrows and the like would also be incorrect if the box didn't have the correct vertical profile inserted. It might also start at a different platform altitude.
Not sure why the intermediate fix matters too much as you would be flying in FPA?
I can see that the go around if different is useful so we can fly it in managed nav. The predictions for descent arrows and the like would also be incorrect if the box didn't have the correct vertical profile inserted. It might also start at a different platform altitude.
Not sure why the intermediate fix matters too much as you would be flying in FPA?
Thread Starter
Join Date: Jul 2009
Location: London
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
Looked at the Jepp chart. ILS/LOC 28L SFO has a fixed that between the FAF and the Runway that is Noted as to only apply to the LOC. If you line selected the ILS you will not have that fix. I don't speak Airbus so I don't know about your FPA being sufficient to disregard fixes on charted approaches.
Some airports have a LOC approach with no GP, such as Macau VMMC runway 16. I went to a Chinese airport the other day which had 4 ILS approach charts per runway. Procedures may vary with radio aids U/S, non radar, climb performance required, RNAV or non RNAV, missed approach procedure ATC require etc.
Fly the correct chart for the approach ATC have cleared you for.
Fly the correct chart for the approach ATC have cleared you for.
