solved Intercepting the ILS/LDA from LNAV

[PT6driver]

Hi,

It seems like I'm having a similar issue to another member on here with the "ILS not working" so to speak. I'm flying from KFSM to KFYV via FSM and the LDA/DME 34 (attached). The issue that I seem to have is capturing the LOC from an LNAV state. Yes, the freq and course are correct. The airplane captures the "final approach course" in LNAV but never actually captures the LOC (both LOC and GS are armed, white).

I have uploaded the approach procedure and two screenshots. The first screenshot shows the aircraft on the 006 radial from FSM heading towards the intercept with APP mode selected. The second picture shows the aircraft on "course" but without the LOC being captured. I'm just trying to figure out if this is IXEG specific issue/bug or true to life (which I don't think). The IXEG will not descent on the G/S in LNAV, either.

I have replicated this exact flight and configuration with the FF B767 and it does capture the LOC and GS from LNAV.

Thanks for any help or clarification.

00728LDAD34.PDF

Edited March 1, 2018 by Morten

[Litjan]

The capture critieria for the LOC and GS are fairly stringent - on purpose to prevent pilots from doing fringe or silly things ;-)

The LOC will capture according to closure rate. If you are closing with it very slowly (i.e. the needle moving towards the center very slowly) you will have to be almost ON the LOC before it caputures. Your second shot shows you being one dot left of the LOC, with a closure of 1 deg - almost nothing. The LOC seems to be offset from the LNAV approach path, possibly due to the LOC not being aligned correctly in the X-Plane world (remember that ILS components are NOT updated with Navigraph/Aerosoft updates).

The GS can ONLY capture after the LOC has captured - so you can never fly GS with LNAV.

Cheers, Jan