Jump to content

Sign in to follow this  
Guest jcstuan

Stalling problem in the 747

Recommended Posts

Guest jcstuan

HeiToday as before, I keep stalling my PMDG 747. This is from my atempt to cross the pond today.probasv65cf.jpgprob3aw.pngI am running, ASv6, BAV ACARS besides F9. Does someone have a clue what I can do to not stall the aircraft..Johan Christian

Share this post


Link to post
Guest The_Glideslope

I'm no expert here, but I think this is bad programming of the FMC in the weights and/or speed page.Check your weight balance and CG.Also check your speed-brakes... just in case...I'm no expert here, but whenever this things happens you should hit TOGA. It's very strange that at 33000 you get Caution speeds at 230 kts and with full thrust, it looks like the speedbrakes are out or even the gear...Could not reproduce this in my computer without Gear, Spoilers or flaps engaged.

Share this post


Link to post
Guest fjbicrf

One thing that the screenshot doesn't show is how much fuel that you have on board. What is the weight of the cargo? What is the total fuel weight? It could be that the aircraft is too heavy to be flying at that altitude. Maybe try an initial cruise of say FL280 and see how that works.Just some thoughts.Fred Bray

Share this post


Link to post
Guest The_Glideslope

Exactly! MTOW! But the airplane wouldn't even climb there, I'm affraid. This leads to another thing I remember.Did you add fuel quantity/weight AFTER FMC weights and balance programming? Speeds are set to a certain weight, if changed they need to be updated before leaving the ground (in fact before APU or engine start due to fuel consumption) or else the airplane will be trying to fly on lower weight calculations.Lack of Fuel can't be an issue since the engines are at full RPM and there is no EICAS warning. Did you clear any messages on the EICAS?I also noticed that you are flying with an head-wind of 44kts, make a test with no winds. Just is case Active Sky got nutty up there...

Share this post


Link to post
Guest D17S

Your "early warning system" was that thrust was all the way up against the EICAS thrust limit. Thrust was at EICAS limit long before the stall occurred, it just isn't something we know to look for. If you see this, do something! Doom is just a dinner break away. Airspeed will slowly bleed off until the stickshaker . . . interrupts your last bite of filet.Here

Share this post


Link to post

Looks like the incorrect ZFW has been entered into the FMC. As Sam has pointed out the thrust is as high as it can go (although the ref should be CLB not CRZ). It appears there is a step climb about 450nm away which would not be correct in this situation. Check your weights first. Be aware of loading panel states as this will also enter the ZFW when the panel was saved. This may not be the same as the actual for your intended flight. If you think you have it right go to the vnav CRZ page and see what the optimum and max altitudes and choose a FL accordingly. CheersSteve


Cheers

Steve Hall

Share this post


Link to post
Guest lou ross

If there are changes in the winds aloft- speed or direction- this happens with many flight sim a/c. Solution is to go to the winds page in Registered FSUIPC and enter smoothing to be 0; 5; 8.

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    2%
    $540.00 of $25,000.00 Donate Now
×
×
  • Create New...