about IAN(integrated approach navigation )system
Joined: Apr 2010
Posts: 9
Likes: 0
From: Hawaii
my question is the use of IAN on an RNAV RNP approach with RF legs. Can you use IAN? My understanding is Boeing says it is not recommended in descending turns as the descent profile is not assured. Does anyone have any more information on this? Would appreciate any references
Joined: Sep 2011
Posts: 352
Likes: 148
From: FL390
If an RNAV/GPS approach is loaded, and an ILS is available for the same runway, the system simply uses the LOC and G/S for guidance, once captured, since they are more accurate than LNAV and VNAV.
Common localiser frequencies for the reciprocal runway would cause an RNAV approach to end in tears.
Joined: Jun 2007
Posts: 3,443
Likes: 39
From: Wanderlust
IAN is a way of using FMS vertical glide path when ILS glide path is not available. Airbus has a similar system and calls it FLS or Flight management Landing System. It may be a VOR approach where vertical guidance is not coded in FMS, what's called managed in Airbus or using ILS localiser only approach because GS is not available. It cannot be that IAN will use ILS when you want to do a VOR approach. because which minima will you use. It helps flying a non precision approach ILS like with FD LOC and GS indications but from FMS. It cannot be used for RF leg approach.
Last edited by vilas; 26th November 2021 at 04:45.
Joined: Jun 2007
Posts: 71
Likes: 0
From: FL350
what is the definition of a “straight in approach”? I saw somewhere that this is around 3degrees of centerline. Is that correct? Does that mean you shouldn’t do an IAN on an OFFSET approach?
