During a descent into LAX following the Palmdale approach to 24R, I recieved a VNAV disconnect at about FL150. I attempted to re-engage VNAV but no luck. What would cause a disconnect? I was on speed and following the descent profile.Dave FisherCYYZP4 2.8 GB 478P 533 MHZ CPUP4P800S Asus Motherboard512 DDRGeforce Ti 4200/128Maxtor 80 Gig ATA 133 HDhttp://www.precisionmanuals.com/images/forum/ng_driver.jpg

Dave,What was the message given from the FMC for the VNAV disconnect?Can you send us the complete flightplan you used?Thanks,

Could it be you had an AT failure or N1 dis-symmetry ?I posted info on this. Search the forum on VNAV DISCONNECT.anthonyAnthony MertonPrecision Manuals Developmenthttp://www.precisionmanuals.com

Thanks Anthony, that post explained it. During descent I had a wind shift that wasn't programed into the forcast page, causing an overspeed disconnect after that I lost the profile so VNAV disconnected.Dave FisherCYYZP4 2.8 GB 478P 533 MHZ CPUP4P800S Asus Motherboard512 DDRGeforce Ti 4200/128Maxtor 80 Gig ATA 133 HDhttp://www.precisionmanuals.com/images/forum/ng_driver.jpg