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PMDG 738 will not follow flightplan after TOD

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2 flights now, 1 from Sydney to Brisbane, the second this morning from Auckland to Sydney, and both times after TOD the 737-800 just goes off on it's own merry way completely disregarding the flightplan (simbrief), either flying straight on or turning in the completely opposite direction.

I'm not new to this plane due to flying it for many years in P3D, but I am pretty new to this version in MSFS - is there a process I'm not following or a button I'm not hitting? Flightplan(s) contained no vectors or discos, very frustrating having to hand fly from 30-odd thousand feet. 

i9-13900K | 6400MHz DDR5 (32GB) | GeForce RTX 4090 24GB

MSFS 2024 | PMDG 777-300ER | FBW A380X | Fenix A320 | ini A350

33 minutes ago, verbal said:

2 flights now, 1 from Sydney to Brisbane, the second this morning from Auckland to Sydney, and both times after TOD the 737-800 just goes off on it's own merry way completely disregarding the flightplan (simbrief), either flying straight on or turning in the completely opposite direction.

I'm not new to this plane due to flying it for many years in P3D, but I am pretty new to this version in MSFS - is there a process I'm not following or a button I'm not hitting? Flightplan(s) contained no vectors or discos, very frustrating having to hand fly from 30-odd thousand feet. 

Are you arming LNAV before takeoff and does it show on the PFD? What's the heading bug set to on takeoff, runway heading?
If you are confident you know how to use the 737, I can only think of a corrupt panel state as the cause.
 

For transparency: I'm a community mentor at the BATC discord. However, I do not get paid for it in any way.

42 minutes ago, Fiorentoni said:

Are you arming LNAV before takeoff and does it show on the PFD?

What has arming the LNAV prior take-off to do with top of descent?

3 hours ago, verbal said:

completely disregarding the flightplan (simbrief),

Since you specifically mention a simbrief flight plan, have you verified the route you want to fly is correctly programed in the FMC?  There is an issue where, if you import a simbrief flight plan into the FMC using the simulated datalink function (the "request" option on RTE page 1), you will only get the enroute portion of the flight plan. SIDs and STARs will not be imported, you'll need to select them manually and close any discos.

If you imported a flight plan from simbrief and then didn't manually select a STAR, it makes sense that the plane would diverge from your simbrief-planned route near TOD... simbrief is probably showing you on a STAR, but it's not in your FMC so the aircraft is going direct destination after the final enroute fix. (Actually, it may just fall out of LNAV and continue on present track; I've never actually let the box reach the end of the route in the sim or the real plane; I'm not actually sure where it might go ;).  )

Edited by Stearmandriver

Andrew Crowley

  • Author
2 hours ago, Fiorentoni said:

I can only think of a corrupt panel state as the cause.

Bingo, I think you're on a winner there, I will do a test flight later today and see.

Cheers. 

i9-13900K | 6400MHz DDR5 (32GB) | GeForce RTX 4090 24GB

MSFS 2024 | PMDG 777-300ER | FBW A380X | Fenix A320 | ini A350

14 hours ago, Farlis said:

What has arming the LNAV prior take-off to do with top of descent?

Oh wow I completely skipped the TOD part in his post and thought it was happening after takeoff 😄 So much for answering posts at midnight...

For transparency: I'm a community mentor at the BATC discord. However, I do not get paid for it in any way.

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