jethrocch

In my case, I have the default TL overrides AT in arm mode only. I have figured out why the autothrottle is not holding the commanded speed. The problem solved when I went back to FSX default weather (I was using the weather engine FSGRW)

Hi guys. I finally bought myself this wonderful aircraft. Currently, I just want fly a short flight from VHHH to RCTP, a flight last for 1:10. My takeoff weight is around 436000 pounds. Here are 2 questions I encountered: I entered my departure route and runway to the FMC (using runway 07R and OCEAN2A departure). Using flaps 5 and full thrust at 58 C, when I engaged TO/GA, all was going well. I did not hear takeoff configuration warning either. But then at around 100 knots, the autothrottle regarded to idle, triggering the autobrakes and I had to reject the takeoff. I tried a second time and all was fine. I decided to experiment a few times and I noticed this occurred randomly. For me, I was using the mouse wheel for rudder steering. (up for left rudder and down for right) There OCEAN2A departure has a altitude constraint of 5000. I decided to let the autothrottle to do the level off. At this light weight, the climb weight was 4000fpm and the airplane did overshoot for around 200 feet. The speed exceeded 250 knots too. I was what I expected as said in FCTM for low altitude level off at light weight. The FMC commanded a speed of 250 but the airplane accelerated to 280 knots and got stablised at that speed. The autothrottle had no intentions to reduce thrust to slow down. So I took over manually, either moving back on the throttle with FMA still in speed mode or completely disarming the autothrottle. In the second case, I managed to slow down manually. But as soon as I re-engaged the autothrottle, the thrust increased again and airspeed exceeded the commanded speed. Any help is appreciated. Thanks Jethro Chan

Opps...... I did not check this box before. This could be the major problem. Thx

Thanks. I will not use the real world weather (update every 15 minutes) build-in feature anymore when flying this acft. Once the acft stablize on glide slope, A/T off The movement of rudder is quite large (half deflection frequently) when yaw damper is on. I wonder whether this will exceed the structural limit of acft in high speed cruise flight. All pessengers will sick and vomit in hours of oscillation. Anyway, clear all weather from now on.

I have been flying the PMDG 737 for a few months and I have 2 questions about the yaw damper and the auto throttle. I would like to know what is the correct procedure. 1. Should I turn on the yaw damper at all times from engine start to parking? The reason I ask this is that the aircraft seems to occillate (yaw) back and forth in flight even in light turbulence. The acft can only remain smooth flight at perfectly smooth air. Looking at the position of rudder, I am quite sure that this is due to the yaw damper action. The rudder is moving left and right at nearly once per second. When I switch off the yaw damper and center the rudder, everything stops and the acft flies smoothly. What is the real world procedure here? 2. The FCOM seems to say that it is OK to leave the auto throttle on when manually flying the final approach. When I push on the stick to steepen the descent, the throttle decreases automatically which is fine. But when I flare at about 30 feet to slow a bit and reduce the descent rate, the auto throttle does not allow me to do so. It keeps at the target speed and the throttle increases during flare. I end up floating down the runway and have difficulty to land. I have heard that the auto throttle would disengage automatically when touch down. Should I disengage before flare? Thanks a lot!