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Altitude Hold |
DVA13111
Captain, B737-800
Joined on October 11 2016
50 State Club
Century Club
Everett Century Club
Eurocap Club
Abingdon, MD
110 legs, 129.9 hours
108 legs,
126.6 hours ACARS
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Posted onPost created on
October 29 2016 12:07 ET by Brian Ward
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After I have climbed to altitude and am in level flight, the airplane(B737-800) climbs on its own by about 300 ft. sometimes higher. ATC keeps telling me I am too high and to reduce altitude. The airplane slowly reduces altitude back to assigned altitude an the starts repeating the climb an descent again and again. Does anyone know what is causing this to happen?
Brian WardCaptain, B737-800
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DVA10902
Senior Captain, B767-300
Joined on July 12 2012
50 State Club
Everett 250 Club
DVA Five-Year Anniversary
Online Quadruple Century Club
Quincentenary Club
"Where am I? Who dressed me like this?"
Bloomingdale, IL
515 legs, 1,153.3 hours
473 legs,
1,063.5 hours online
514 legs,
1,150.2 hours ACARS
9 legs,
19.0 hours event
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Posted onPost created on
October 29 2016 18:39 ET by Tim Oleary
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Which 737...PMDG?
A few of the obvious ones is if you are in flight level altitude bands (above 18K in the US-NOTE:Transition altitudes can vary by country or can be in meters which is a real joy to fly.) have you set your altimeter to 29.92" (standard)?
If you are using the FMC is your flight planned cruise altitude entered correctly as well as the legs page showing the waypoint altitude correctly?
Do you have a failure mode enabled that effects the pitot-static system?
Those are the quick and dirty ones I can think of....
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DVA13111
Captain, B737-800
Joined on October 11 2016
50 State Club
Century Club
Everett Century Club
Eurocap Club
Abingdon, MD
110 legs, 129.9 hours
108 legs,
126.6 hours ACARS
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Posted onPost created on
October 29 2016 21:53 ET by Brian Ward
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I am using the FSX base 737-800, Flying at 18000 ft, no failure mode enabled and altimeter set at 29.92
Brian WardCaptain, B737-800
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DVA9843
Captain, B737-800
Joined on May 22 2011
DVA Ten-Year Anniversary
"High High High... in the sky... there i am.!!"
Mercier, QC Canada
19 legs, 23.9 hours
14 legs,
16.7 hours ACARS
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Posted onPost created on
October 29 2016 22:58 ET by Eric Laferriere
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Did you try one of the 737-800 that is on the DVA website too see if it's doint the same thing ?
Eric LaferriereCaptain, B737-800
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DVA9505
Captain, B757-200
OLP
Joined on February 19 2011
50 State Club
Globetrotter
Everett 500 Club
US Coastal Club
Online Century Club
Commuter Conquest
Flying Colonel
DVA Ten-Year Anniversary
Million Mile Club
Cascadia Club
Virginia Beach, VA USA
1,807 legs, 3,271.3 hours
102 legs,
201.1 hours online
1,805 legs,
3,266.0 hours ACARS
2 legs,
3.3 hours event
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Posted onPost created on
October 29 2016 23:25 ET by Sean Costello
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Hi Brian, welcome. Were you flying online with Vatsim, or using FSX atc?
Sean CostelloCaptain, B757-200
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DVA11250
Captain, B757-200
OLP
Joined on January 14 2013
50 State Club
B757 100 Club
Everett 250 Club
DVA Ten-Year Anniversary
Quatercentenary Club
Online Triple Century Club
Blaine, MN
440 legs, 881.1 hours
320 legs,
640.2 hours online
439 legs,
879.2 hours ACARS
20 legs,
49.2 hours event
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Posted onPost created on
October 30 2016 03:59 ET by Joel Salminen
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When I calibrated my flight controls through FSUIPC I noticed erratic behavior like that with aircraft that don't interface FSUIPC. To fix the problem I deleted any and all calibration settings in FSUIPC and calibrated through Windows or the SIM itself.
Joel SalminenCaptain, B757-200
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DVA3220
Captain, B737-800
OLP
Joined on May 19 2006
DVA Five-Year Anniversary
B737 50 Club
Southeastern United States
78 legs, 129.9 hours
73 legs,
122.3 hours online
76 legs,
127.3 hours ACARS
31 legs,
57.3 hours event
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Posted onPost created on
October 31 2016 03:18 ET by Tyler Devereaux
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Brian:
Not to discredit any of the suggestions hereto, but I think it is worth considering that the default FSX autoflight systems ... leave much to be desired, as do the default aircraft. Other factors to consider are weather. I'm not sure if you're using any weather products with your sim, but I know my software injects weather that can cause altitude deviations. It's been a very long time since I used default weather, and I honestly don't remember if the default weather will produce conditions that cause difficulty with altitude tracking. But, for sure with my sim, if I'm flying around severe weather, I will notice similar behavior.
You mentioned that you were using 29.92 as your altimeter setting. Are you noticing the altitude deviation in conjunction with a recent change in your altimeter setting? If local pressure and standard differ significantly, the change in altitude readout could very well be significant.
Honestly, though, what you're describing sounds to me like a limitation of default FS quality. It sounds like your autoflight system is too aggressive, so when your plane starts to drift off altitude, the AP over-corrects and then gets stuck in a pendulum of over-corrections. If memory serves correct, I think I remember the default B737's AP having a default vertical speed setting of 1800 (+/-) whenever it needed to capture an altitude. If you're only 100 ft off the altitude and that 1800 fpm rate kicks in, the plane is obviously going to overshoot your selected altitude. I would experiment with different aircraft and see if this problem persists with all of them. Alternatively, I would recommend disabling the autoflight system, manually leveling off and trimming the aircraft, and then re-engaging autoflight once you're level. A very real topic of training in real-world airline ops is the hazard associated with reliance on automation. Do not be afraid (or even hesitant) to disable automation and fly the plane when automation is not yielding expected results.
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DVA13111
Captain, B737-800
Joined on October 11 2016
50 State Club
Century Club
Everett Century Club
Eurocap Club
Abingdon, MD
110 legs, 129.9 hours
108 legs,
126.6 hours ACARS
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Posted onPost created on
November 01 2016 22:24 ET by Brian Ward
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It seems to happen above 18000 ft and a speed of 300 knots. I tried flying with a airlplane I downloaded from DVA, in this instance the airplane started climbing and wouldn't stop going up. Frustrating!!!
Brian WardCaptain, B737-800
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DVA13111
Captain, B737-800
Joined on October 11 2016
50 State Club
Century Club
Everett Century Club
Eurocap Club
Abingdon, MD
110 legs, 129.9 hours
108 legs,
126.6 hours ACARS
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Posted onPost created on
November 14 2016 22:24 ET by Brian Ward
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I found the problem, I exchanged my yoke for my joystick and problem solved, no more porpoising. It's great to be able to fly straight and steady.
Brian WardCaptain, B737-800
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DVA3220
Captain, B737-800
OLP
Joined on May 19 2006
DVA Five-Year Anniversary
B737 50 Club
Southeastern United States
78 legs, 129.9 hours
73 legs,
122.3 hours online
76 legs,
127.3 hours ACARS
31 legs,
57.3 hours event
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Posted onPost created on
November 14 2016 22:38 ET by Tyler Devereaux
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Brian Ward wrote:
I found the problem, I exchanged my yoke for my joystick and problem solved, no more porpoising. It's great to be able to fly straight and steady.
I'm glad you figured it out! Sorry I didn't respond to your last reply; somehow, I missed it. Happy flying
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DVA8657
Captain, B737-800
OLP
Joined on May 19 2010
50 State Club
Globetrotter
South American Samba Club
Million Mile Club
Events Millennium Club
Everett Millennium Club
Flying Colonel
Online Fifteen Century
DVA Fifteen-Year Anniversary
New Hyde Park, NY
1,824 legs, 3,974.8 hours
1,702 legs,
3,725.4 hours online
1,598 legs,
3,443.3 hours ACARS
1,397 legs,
3,095.8 hours event
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Posted onPost created on
December 24 2016 22:16 ET by Brian Kelly
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Yeah sometimes I try to fly keyboard for for unknown reasons my controller was enabled and I wonder why it's acting weHird. (Family Guy joke)
Brian KellyCaptain, B737-800
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