Hi, Indeed, the default B747-400 is full of bugs.
This was all tested on X-plane 11.02b1 default install at LFOH, ILS for RWY 22
-Unable to set manually the ILS frequency and course from the RAD/NAV page of the FMS. I have to do it from the map view by selecting the ILS beacon and set NAV1.
-the LOC indicator on the ND in APP mode is inverted.
-Sometimes the AP speed selector is inoperative with black screen, spinning the knob has no effect on the selected speed displayed on the PFD. When this happens, we have to disconnect A/T, FD left and right and connect them again. Then the AP speed selector comes back to life.
-The LOC/APP AP modes are not working very well. If you first activate LOC, then you will never be able to activate APP. (no green light, no effect). If you select APP from the beginning, all is fine. Sometimes, you want to select LOC and it selects APP
In general, it is really hard to describe a procedure to reproduce a particular case of AP malfunction. But it almost never works as required, sometimes you need 2 complete AP disconnection/reconnection cycles (Disengage bar plus A/T and both FDs) to make the AP work fine again.
When malfunctioning, resetting failures has no effect.
To finish with the B747-400, There are no thrust reversers and the AI B747-400 fly in a very weird manner (always stalling on short final, never able to land, always going around like a rocket and when taking off, trying to rotate way too early)
PS : I started to make a video but decided not to upload it because I think flying the sim and testing all that directly will be more interesting.
All the best with all that, I think it will be a nightmare to debug :{
Here is my log.txt (GTX970, windows 8.1)
http://questions.x-plane.com/?qa=blob&qa_blobid=11749683248460552710