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While flying the Zibo 737-800 mod the plane about every 1 out of 2 times pitches up, stalls and crashes it happens. I tried to see if anyone had the same problem and saw one post which said something about de-icing the plane or something, tried it but still didn't work. It happens consistently at the top of descent. The same thing happened today and just as it happened before it crashed I quitted so it should be somewhere below on the log file, tried to find the problem but couldn't understand anything in the log file. If anyone is knowledgeable about this subject or could give any advice, please do as It has really been annoying me for this past week trying to find a solution, thanks in advance.http://questions.x-plane.com/?qa=blob&qa_blobid=4030393024380127746
Form your description, you could be right that icing may be contributing to the loss of control and crash. Though it is odd that it always occurs at the top of descent. And you said you have turned on the Wing and Engine Anti-Ice on the overhead panel? What’s the outside temperature (TAT) shown on the Engine Display?
Inflight icing generally forms between 0 and -20 degrees C, with visible moisture (e.g., rain, in clouds).
Have you tried posting on the .org Zibo forum regarding the control issue? It is frequented by plenty of experienced users. Since the problem is repeatable, perhaps you can post a short video of the crucial moment and see if you can get an answer of whether it’s a known bug.
As for the default B738, I took the latest rev (11.36r2) up to cruising altitude a couple of times and had not encountered any “beeping” issue. Since you've eliminated cabin altitude as a suspect, sorry, I can’t think of any reason.
P.S. I just noticed in Image1, the IAS was set to 330 in the MCP. That’s pretty high! In fact, when I tried it in the Zibo, it had limited my setting to 275 (at FL370). You can also see that the redline for the IAS was indicated at ~280 kt. Moreover, I believe the 737-800’s max speed is Mach 0.82. The PFD was indicating 0.90. I know the aircraft at this point had already gotten out of control, but what was the IAS and Mach speed just prior to that point.
My guess is the aircraft was suffering structure damage from overspeeding. As I mentioned, the Zibo doesn’t seem to display any message to announce airframe damage, it simply goes unusual attitude on you when that happens. I’d try easing back on the cruising speed to see if that would make a difference.
The Indicated Airspeed speed limit for the B738 (others as well for that matter), decreases with altitude. Because the reading is “indicated”—not the “True” airspeed. Up at FL370, 330kt IAS would probably be supersonic!
I don’t know how “realistic” is the simulation regarding overspeed structural damage. I only hope it’s more forgiving than that in the real aircraft!
You need to read the answer provided in the following link found at https://questions.x-plane.com/26025/intermittent-frame-rate-drop
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