Hi

 

Very recently purchased the PMDG 737NGX and managed to finally got time to fly the tutorial flight last night. It's fantastic, I love this aircraft.

 

Now, the point of this post is about the MCP speed set at V2. I did as the tutorial advised but once I took off and started to climb I started to enter a stall state. Alarms going off the works. At the time I had no idea what I was doing wrong, partly because my mind was fried by using the CDU etc for the first time :)

 

I pushed forward on the stick to gain some airspeed and it disengaged the AP. I recovered the aircraft and then realised the the speed on the MCP was 'hindering' the aircraft. I adjusted this to 250 and resumed AP control and continued the flight (which was amazing, loved the autoland!).

 

Anyway, it doesn't state in the tutorial that the MCP speed should be altered, and it even says to follow the FD command bars to maintain V2+20, which is obviously above the V2 speed set. Ine the picture below the instructions it shows a picture of the PFD with the MCP set speed as 230.

 

Is there something I am missing? does the AP change that speed and I haven't configured it correctly, or is the tutorial suppoed to state to change the speed on the MCP as soon as you take off?

 

Thanks in advance :)

 

Paul Bowers.

Anyway, it doesn't state in the tutorial that the MCP speed should be altered, and it even says to follow the FD command bars to maintain V2+20, which is obviously above the V2 speed set. Ine the picture below the instructions it shows a picture of the PFD with the MCP set speed as 230.

 

In this tutorial you set V2 speed before take off, arm LNAV, VNAV. VNAV activates at 400' agl and automatically set up V2+20. Nevertheless shortly after take off directors will comand you pitch to hold about V2+20. It's correct to set V2.

 

VNAV sets 230kt at acceleration altitude if we used flaps 1 for take off, or after acceleration altitude and after initial flap retractionb is complete and flaps lever is set to 1.

Thanks for the explanation rsvit. I shall revist the tutorial, I must have missed something. Thanks again.

Did you follow the FD? If you climb too rapidly for the set thrust value you will tall. Did you use TO/GA? Doing so you determine a set value of N1.

 

Cheers,

 

Daniel

Yup I followed the FD and used TO/GA, I think that a button I assigned on my stick for Trackir interfered with the AP somehow. Going to refly it. Thanks