crosscheck9 Guest

today, i decided to take my a340 out for a long haul, and so i took off, and climbed at around 300kts above 10000, but I had a huge problem at around 29000 ft. First, I was beggining to realize my GS, on the GPS slowing down, and every second, the ETA was rising by 3 minutes. I figured that if I lowered the vertical speed rate, I could pick up some airspeed. So, instead of climbing a 2200 fpm, i switched to 1400, but then the nose started to rise above 10 degrees, (not good for a340!!!) then my airspeed started dropping faster than before. The plane went into a stall, so I took over thrust, and climb, and tried to get it up to cruise altitude manually, but everytime I got the plane to climb, the airpseed started to drop, and every time I picked up airspeed, the plane was decsending, I couldnt find a proper climb rate. Can someone please explain to me how to solve this problem. + I think the aircraft may have been overweight, but that does not explain the fact that it began disfunctioning 5000 ft before cruise altitude

2 Responses

Pro Member Chief Captain
Jonathan (99jolegg) Chief Captain

Hi Crosscheck,
Firstly, I think 2200 FPM is quite high to climb at 30000 feet. In real aviation, this would decrease as altitude increases, so 1500 FPM is a better vertical speed limit. This is probably why the ground speed lowered, because the high vertical speed setting meant you had a lower speed. I'm not sure why your airspeed dropped after lowering the vertical speed, maybe an after effect of having a high VS before, but thats only a guess 😕. Were you using flaps when you were climbing at this height, because if you did that could have caused the nose to pitch up. Hope that helps 😉

Pro Member First Officer
PH First Officer

It has been mentioned previously that you should fly by speeds rather than rate. Is the aircraft fitted with a FMC? If so go into PERF page and take a look at the recommended climb speed, provided you have programmed it correctly! Try climbing at about 300kias/relevant mach no. Also most heavies step climb rather than go straight to final cruise ie too heavy, burn off fuel at lower FL then when light enough climb again. GS problem is as you pointed out probably to do with the ac reaching ceiling at the given weight. Also worth mentioning is if using real world weather this can happen GS means nothing really it fluctuates with headwind/tailwind.

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