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VNAV Disconnect when Loading Saved Flight
10 replies to this topic
Posted 25 February 2012 - 10:51 AM
I save several flights about fifteen minutes from landing, so that I can return to them whenever I want, and land. For almost all of my flights, I have no problem reloading them. But for one of them, the VNAV Disconnects every time I reload it. I see the VNAV DISCONNECT message on the FMC, and the CWS P message. All the target altitudes and speeds are displayed on the FMC, but none of the estimated altitudes and speeds are displayed. In addition, this always happens when I save flights on this SPECIFIC route from KOAK to KLAX.Any ideas on how to reenable VNAV?Thanks.
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Posted 25 February 2012 - 03:37 PM
This happens when I do the SADDE SIX arrival at KLAX. Here is the link from Airnav: http://184.108.40.206.../00237SADDE.PDF. The chart says to cross SYMON at 12000 ft at 280 knots. When I enter this into the fmc during preflight, it returns, UNABLE 280K at SYMON. What do I do to fix this error?
Edited by ethanpilot787, 25 February 2012 - 04:08 PM.
Posted 26 February 2012 - 06:36 AM
For me it happened at KFLL doing a SID. I don't remember which one but I was able to do many other departures from a saved flight where VNAV behaved just expected.I have no clue why it works for some and for others it doesn't!David Di DomizioIf you search this forum you can see I also posted a video of the problem.David Di Domizio
Posted 26 February 2012 - 06:47 AM
Saving/reloading any flight with SID/STAR saved in fmc will result in weirdness. It is pretty much always recoverable. I'm on tapatalk so I'm not sure how to link to another post but search VNAV disconnect and I've posted a workaround. I can get the flight back in 95% of cases now with VNAV. you have to fool the FMC. As Matt says, alt restrict will mess it up. The only times I can't recover are at or close to t/dBut you can hand-fly it (or use lvl chg) from there to the next w/p and reconnect hopefully