February 4, 201214 yr Hi,This is the first time I've had a problem system-wise with the NGX. I've switched VC configs, clicked the SPD INTV button, flipped AT on and off, as well as both FD switches, and still can't get a ligh to show under the VNAV button. I thought maybe I didn't have VNAV installed in the aircraft I was flying, the PMDG Southwest paint for the 700WL, but that wasn't it.Any Help? or just reinstall?
February 4, 201214 yr What does the Flight Annunciator read?/ Leffe Leif A Mikkelsen **********************
February 4, 201214 yr Ok, have you configurated the ac before take off. Set right trim? No pressure on yoke/stick?/ Leffe Leif A Mikkelsen **********************
February 4, 201214 yr Author Yep, Trim is good, no stick pressure, flaps set to 5, and fully configurated.
February 4, 201214 yr Ok, try to use Lvl ch for pitch mode some min and then try to change back to Vnav/ Leffe Leif A Mikkelsen **********************
February 4, 201214 yr On the ground, will arm before you start your T/O?Check your FMC and make sure everything is filled and executed. Matt Cee
February 4, 201214 yr Author On the ground, will arm before you start your T/O?Check your FMC and make sure everything is filled and executed.No, it won't arm on the ground, and I double checked to make sure that everyting was filled out, and it wasOk, try to use Lvl ch for pitch mode some min and then try to change back to VnavI tried this, and this also didn't work.
February 4, 201214 yr Hmm, peculiar, cause I never have any probs engaging Vnav.Maybe there are some others with ideas?/ Leffe Edited February 4, 201214 yr by Leffe Leif A Mikkelsen **********************
February 4, 201214 yr No, it won't arm on the groundMaybe the first waypoint isn't within 5 degrees of the runway heading? In that case you won't be able to arm on the ground. Don't know why it won't go on after getting in the air... The only time I couldn't get VNAV on was after loading a saved flight.... Did you load a saved flight by any chance?
February 4, 201214 yr Author Maybe the first waypoint isn't within 5 degrees of the runway heading? In that case you won't be able to arm on the ground. Don't know why it won't go on after getting in the air... The only time I couldn't get VNAV on was after loading a saved flight.... Did you load a saved flight by any chance?I thought the 5-degree thing was LNAV, that can arm on ground
February 4, 201214 yr I thought the 5-degree thing was LNAV, that can arm on groundYour right Jackson.For VNAV to work you have to fill in the PERF page so that the FMS knows the weight of the plane etc and can therefore calculate the climb profile etc. Regards Nixon Thomas
February 4, 201214 yr Author Your right Jackson.For VNAV to work you have to fill in the PERF page so that the FMS knows the weight of the plane etc and can therefore calculate the climb profile etc.Here's the funny thing, all speed/altitude targets are shown and visible on the LEGS page, its just the button that won't turn on.Just a thought, Service based failures are turned OFF
February 4, 201214 yr I thought the 5-degree thing was LNAV, that can arm on groundOops. LOL, of course. My bad... :( Edited February 4, 201214 yr by Guest
February 4, 201214 yr Here's the funny thing, all speed/altitude targets are shown and visible on the LEGS page, its just the button that won't turn on.Just a thought, Service based failures are turned OFFI guess a ticket to PMDG would be the best option. Regards Nixon Thomas
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