Jump to content

Archived

This topic is now archived and is closed to further replies.

GraemeBr

LNAV engage issue

Recommended Posts

I have used LNAV and VNAV with no problems up till now.In my last flight though after take-off I armed VNAV and LNAV but when I selected CMD A, LNAV turned off. After some trial and error I found that I could use the CMD B autopilot in LNAV and VNAV with no problem. Any ideas what I might be doing wrong?


Graeme Brown

 

Banner_FS2Crew_NGX_Driver.jpg

Share this post


Link to post
Share on other sites

Check failures as your FCC A might be broken if you can't use CMD A. Make sure you don't break the AP using your joystick (read the intro, it's explained there).But I've certainly come across the issue that LNAV wouldn't engage after takeoff despite definate perfect engagement criteria. sig.gif

Share this post


Link to post
Share on other sites

Thanks. I have service based failures on. I have checked the failures in the CDU. How can I tell if a system or item has failed? There is no indication that anything is wrong.I read the point in the manual about breaking the autopilot by forcing the yoke. I don't think that is the issue, but that's a great level of detail on PMDGs part :-)


Graeme Brown

 

Banner_FS2Crew_NGX_Driver.jpg

Share this post


Link to post
Share on other sites

When you go to the failures page it would say ACTIVE FAILURES at the top right away, hard to miss. Click on that if there are any. Can be cleared altogether from there. Otherwise I don't know. I've had numerous weird AP-dont-wanna-engage issues here and there, still fiddling around. sig.gif

Share this post


Link to post
Share on other sites

I had exactly this problem today. I could not activate LNAV, anything else worked. I switched to Cmd B and then I could activate LNAV. I had no failures (ACTIVE: (NONE))


Helge Rasmussen

Share this post


Link to post
Share on other sites

  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    42%
    $10,670.00 of $25,000.00 Donate Now
×
×
  • Create New...