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Guest Nickman

VNAV issues

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Guest Nickman

Has anyone been having any VNAV problems with new 800/900? It seems when the speeds switch to above 10,000 agl, the VNAV speed is set to 0. Anyone have a solution or the same problem?

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Guest georg

Never met this one :( I assume you have some mistake in FMC.

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Guest amerton

You have to sign your posts with your real name. Checkout forum rules pinned post.Can you post here more details and a screenie of what happens showing CDU CLB page and the PFD and ND and EICAS ?This would helpanthonyAnthony MertonPrecision Manuals Developmenthttp://www.precisionmanuals.com

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The speed will go to the climb target so from airport restriction 250 to XXX. Are you using add-on wheather perhaps? You say the speed is going to 0 so I am assuming you mean the PFD's spd tape? A screenshot would talk a million words ;)[h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/forum/betaimg.jpgAMD 64 3200+ | ASUS KV8 DELUXE | GFORCE 5700 ULTRA @535/1000 | WD SATA 80 GIG | 512 DDR 400 |

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I've had a similar issue with the /900. Once above FL100 the target speed stays at 250kts and the A/T reduces N1% TO 33 causing a stall.FMC CLB page has the correct data but for some reason the A/P goes south. I'm going to try different weights to see if it happens again. BTW, he /800 is fine.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

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Guest amerton

Thanks Dave,Something very weird there...When the AT reduces to 33%, what's the target N1 on the EICAS ?anthonyAnthony MertonPrecision Manuals Developmenthttp://www.precisionmanuals.com

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Ok Dave, Here is the 900 VC Alaska livery in VNAV passing 10000', nothing strange whatsoever in fact I was in a reduced climb 1 to boot. Take a look here- http://forums.avsim.net/user_files/73215.jpg So wat we ned to know is what you are doing exactly, FMC loading, weights etc etc anything else you have running at the same time. [h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/forum/betaimg.jpgAMD 64 3200+ | ASUS KV8 DELUXE | GFORCE 5700 ULTRA @535/1000 | WD SATA 80 GIG | 512 DDR 400 |

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OK Randy, I've made a few successful climbs, the only thing I've noticed was an erratic climb rate. I would go from 2500fpm to 5000fpm, as the airspeed bled off I'd go back to 1000fpm then finally settle at about 3000fpm. One question about TCAS I'm using UT so I've set the preferance to 2004 internal and set TA/RA on the transponder, yet I've got no traffic showing. Any ideas?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

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Guest Nickman

Well, after doing some tests I've noticed its not always at 10,000. And when the speed does set itself to 0, you can set it back by just setting the speed to what it should be. I'll post a screenshot in a few.Nick B.http://www.precisionmanuals.com/images/forum/800driver.jpg--AMD Athlon XP 3200+nVidia GeForce FX 52002 x 512 PC400Soyo SY-KT600 Dragon Plus100 GB Western Digital

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Can I take a wild guess and say that you both are using Active Sky for weather? I have a sneaky feeling thats the case of the IAS going to 0.[h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/forum/betaimg.jpgAMD 64 3200+ | ASUS KV8 DELUXE | GFORCE 5700 ULTRA @535/1000 | WD SATA 80 GIG | 512 DDR 400 |

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Randy,I use ActiveSky and have had speed drop to zero but it is only the IAS tape that drops (I think), the engines are still running a good N1 rate and the IAS tape will recover in a few seconds. I have never had a stall or such when that happens.I guess it's related to that undocument FS9 'feature' of violent wind shifts.Dave

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