plz help! autopilot has a mind of its own! df737

[noamkrief]

on takeoff in the 737, i press the togo button and i rotate at vr. i use the FD and a/t for the climb. At around 1000' agl i turn on the CMD-A and Lnav works fine. But when i press VNAV it starts doing some crazy stuff. I have my altitude set for 5000' MSL due to atc limitation but whenever i press Vnav it either won't let me select it, or when it sometimes RANDOMLY does, it slowly starts descending down to the ground. I try to scoll up with the v/s thumbweel to make it climb but i get no reaction out of the thumbweel. I try pressing the alt button again. No reaction. I pull back on the yoke, no reaction. The alt function is obviously engaged because it won't let me pull up manually.

The only way to fix this? I found out when i increase the altitude from 5000 to 6000 lets say, the numbers under the v/s thumbwheel show up at whatever v/s i am currently. In my case it's almost allwasy around -2000vs and i have to scoll that # up to 2000'. This is VERY UNREALISTIC!!!!!!!!!!!!!!
Or maybe it is. Maybe in a real 737 when you take off, you can't just simply set 5000' and actually expect the plane to climb up to that altitude at a specific v/s.. Maybe a real 737 just tried to plummit to the earth and wont respond to anything unless you change the altitude restriction to a different alt.


Another problem i'm having is probably not a fault in fs2002 or dreamfleet. It's the descent capture. On the map on a cruise, it shows me when the a/c is suppose to start descending to reach a certain fix at lets say 12000' But the a/c crosses that fix without descending. Before the fix i make sure that i change th alt on the a/p to 12000' but still, not descent.

Only thing that somewhat works is going to the fmc and going to the desc option and selectiong capture. But even if i didn't reach the fix yet, and i press capture, it starts descending...

Also, on slow flight. around 200kias, which is not that slow with 5deg of flaps lets say, the stupid a/c won't turn past 10deg of bank! I mess around with the bank angle knob but it does nothing..

There are many many more bugs with this 737. I love the fact that's it's extremely realistic but the contrast between this realisim and these crazy "bugs" is very high and makes it very unpleasant to fly.

plz help
Noam

[scott967]

> on takeoff in the 737, i press the togo button and i rotate at vr. i use the FD and a/t for the climb. At around 1000' agl i turn on the CMD-A and Lnav works fine. But when i press VNAV it starts doing some crazy stuff. I have my altitude set for 5000' MSL due to atc limitation but whenever i press Vnav it either won't let me select it, or when it sometimes RANDOMLY does, it slowly starts descending down to the ground. I try to scoll up with the v/s thumbweel to make it climb but i get no reaction out of the thumbweel. I try pressing the alt button again. No reaction. I pull back on the yoke, no reaction. The alt function is obviously engaged because it won't let me pull up manually.<

I've seen this behaviour, but I'm not sure what causes it.
I suspect it is related to the altitude limit set on a
departure waypoint on the LEGS page. I find if there is
a limit on departure it is better to climb in LVL CHG
until you get cleared to cruise alt, and then use VNAV
for the climb to cruise (after passing the limited
waypoint). I haven't tried yet, but it may be
worth experiemnting with a different climb mode than
ECON PATH.

scott s.
.

[sandman161]

Noam,

I directly recongnised your problem. Same here. Excactly the same kind of phenomena. Did the suggestion of scott s. help at all. Let me know plz. Fill me in with the details.


TX
Marty