What if you engage the AP at cruising altitude? which trim position do you need to set in order to engage AP at that time?

Yeah, but being correctly trimmed is part of the criteria is it not?

Nope, criteria is "no force is being applied to the control wheel" and "the stab trim autopilot cutout switch is at normal".

Nope, criteria is "no force is being applied to the control wheel" and "the stab trim autopilot cutout switch is at normal".

 

If no force is being applied to the control column surely you should be trimming, it's bad practice not to and allow the autopilot to catch up. Reason I said you need to be in correct trim is if you're not putting pressure on the controls the aircraft is doing what it likes if it's not trimmed, hence the two go hand in hand.

 

Semantics at the end of the day so we won't get too much into it but either way i'd suggest to the OP that you check there are no active failures set too.

You missed something setting up the FMC, try the tutorial, step by step and you won't go wrong. Also, you need to sign your posts in this forum.

You missed something setting up the FMC, try the tutorial, step by step and you won't go wrong. Also, you need to sign your posts in this forum.

 

Ok, this is a nonsense. To summarize: You do not need "correct trim", flight directors, fms... to engage autopilot.

I have done another test in another flight.

 

I don't know what solved my issue but i used another Livery for the PDMG 737-800 NGX from Delta Airlines (previously i used Ryanair) and noticed that the MCP looked a bit different.

 

Was it a bug in the Ryanair livery or was it because this time i trimmed the plane correctly before takeoff?

I am not sure. I will try to reproduce it with the Ryanair livery with the correct trim settings...

Once again, there is no correct trim for autopilot engage.

Once again, there is no correct trim for autopilot engage.

So i guess, the Ryanair livery was defect ? Is it possible... I could engage the AP without any problem with the Delta livery

So i guess, the Ryanair livery was defect ? Is it possible... I could engage the AP without any problem with the Delta livery

No, you were probably using a different MCP module.

 

Have you done the tutorials and read the intro manual? It helps out a lot. Its there for a purpose, and you need to at least read these 3 things: the intro manual, tutorial 1 and tutorial 2, before you set off to wherever.

 

The NGX is expensive for a reason, and its a learn to fly aircraft.

 

If you have done all these things however, then check your yoke calibration. I have the same yoke as you and I have no problem. By manual trimming what do you mean? Changing the trim using the wheel at the side of the throttle quadrant? Like others have said above, you should assign trim controls, one for increase and one for decrease. Ive assigned mine on the 2 switches below the big red thumb button on the yoke. Make sure you have FD turned on and VNAV. Not sure if thats a criteria, but if you didn't turn them on takeoff then that might be the issue. Also, when youve climbed out and gears are all up, make sure the attitude of the aircraft matches the FD, and that you have trimmed your aircraft so that theres no pitch input needed. Then turn on the AP.

Let's try this again.

 

Like g_precetralis said, there is no trim setting required.

 

You should have no input on the yoke when you want to engage the A/P. That means that if you want the airplane to stay in the F/D, it should be trimmed so that it will stay where you want it. If you're climbing at 290knots, you should have it trimmed for "hands-off" flight and you should be able to release the yoke and the attitude won't change.

Let's try this again.

 

Like g_precetralis said, there is no trim setting required.

 

You should have no input on the yoke when you want to engage the A/P. That means that if you want the airplane to stay in the F/D, it should be trimmed so that it will stay where you want it. If you're climbing at 290knots, you should have it trimmed for "hands-off" flight and you should be able to release the yoke and the attitude won't change.

 

What i've tried to say about 100 times...

What i've tried to say about 100 times...

Yep.