QW 787 Bizarre FMC Issue Just Developed. Need Help

[btacon 1,806]

Hi, keeping it short:

• P3d V5 HF2
• QW 787 latest Service Pack (aug 2)
• Aircraft, while flown seldom has performed as designed at least once
• I have been putting in some serious hours with PMDG AC FMC and I have adequate skills to fully use the FMC from takeoff to landing

Starting yesterday, after just having flown this flight plan successfully the day before (KLAXKJFK) the Aircraft repeatedly performs  a series of events which result in a spectacular crash in less than two minutes. This is how it goes:

• Engage AT, departure roll begins as expected
• 80 Knot callout
• V1 callout
• Rotate callout
• Positive rate of climb, gear up callout.
• Aircraft is climbing steady and passing 1000 AGL when Betty starts screaming:
• TERRAIN ALERT. TERRAIN ALERT. PULL UP. WHOOP WHOOP
• (we’re still climbing)
• Airspeed remains N1+ but stall shake is now present (Betty still shouting)
• Sometime soon after that the AT slams the throttles fully closed, the FMC is now over commanding  and the aircraft flat stalls and pancakes in some LA neighborhood 
• And it behaves pretty much that way over and over no matter what flight plan is in FMC, it happens. When hand flying without AT it seems Ok. 

Any Ideas or suggestions?
TIA,

-Braun

PS...I remember some message appearing in FMC about landing configuration or profile, can’t exactly remember but the message definitely had the word landing in it   Also I’ve not posted in QW forum as of yet but will copy and paste this there also

Thanks again

Edited September 19, 2020 by btacon
Update

[cowpatz 243]

Have you uninstalled and reinstalled it?

[mikeymike 362]

2 hours ago, btacon said:

Hi, keeping it short:

• P3d V5 HF2
• QW 787 latest Service Pack (aug 2)
• Aircraft, while flown seldom has performed as designed at least once
• I have been putting in some serious hours with PMDG AC FMC and I have adequate skills to fully use the FMC from takeoff to landing

Starting yesterday, after just having flown this flight plan successfully the day before (KLAXKJFK) the Aircraft repeatedly performs  a series of events which result in a spectacular crash in less than two minutes. This is how it goes:

• Engage AT, departure roll begins as expected
• 80 Knot callout
• V1 callout
• Rotate callout
• Positive rate of climb, gear up callout.
• Aircraft is climbing steady and passing 1000 AGL when Betty starts screaming:
• TERRAIN ALERT. TERRAIN ALERT. PULL UP. WHOOP WHOOP
• (we’re still climbing)
• Airspeed remains N1+ but stall shake is now present (Betty still shouting)
• Sometime soon after that the AT slams the throttles fully closed, the FMC is now over commanding  and the aircraft flat stalls and pancakes in some LA neighborhood 
• And it behaves pretty much that way over and over no matter what flight plan is in FMC, it happens. When hand flying without AT it seems Ok. 

Any Ideas or suggestions?
TIA,

-Braun

PS...I remember some message appearing in FMC about landing configuration or profile, can’t exactly remember but the message definitely had the word landing in it   Also I’ve not posted in QW forum as of yet but will copy and paste this there also

Thanks again

I’m not surprised the aircraft is a total disaster.

ive had many issues also.

qw is a disaster. I should have opted for a refund.

pathetic.

and don’t even bother on their forums.

they don’t respond at all.

mike

[Bob Scott 7,721]

6 hours ago, btacon said:

Hi, keeping it short:

• P3d V5 HF2
• QW 787 latest Service Pack (aug 2)
• Aircraft, while flown seldom has performed as designed at least once
• I have been putting in some serious hours with PMDG AC FMC and I have adequate skills to fully use the FMC from takeoff to landing

Starting yesterday, after just having flown this flight plan successfully the day before (KLAXKJFK) the Aircraft repeatedly performs  a series of events which result in a spectacular crash in less than two minutes. This is how it goes:

• Engage AT, departure roll begins as expected
• 80 Knot callout
• V1 callout
• Rotate callout
• Positive rate of climb, gear up callout.
• Aircraft is climbing steady and passing 1000 AGL when Betty starts screaming:
• TERRAIN ALERT. TERRAIN ALERT. PULL UP. WHOOP WHOOP
• (we’re still climbing)
• Airspeed remains N1+ but stall shake is now present (Betty still shouting)
• Sometime soon after that the AT slams the throttles fully closed, the FMC is now over commanding  and the aircraft flat stalls and pancakes in some LA neighborhood 
• And it behaves pretty much that way over and over no matter what flight plan is in FMC, it happens. When hand flying without AT it seems Ok. 

Any Ideas or suggestions?
TIA,

-Braun

PS...I remember some message appearing in FMC about landing configuration or profile, can’t exactly remember but the message definitely had the word landing in it   Also I’ve not posted in QW forum as of yet but will copy and paste this there also

Thanks again

Flaps?

"Airspeed remains N1+"...say what?  N1 is a power indication (compressor fan speed), not an airspeed.

Make sure you entered load (fuel and payload) in the same units FMC is set to...using lbs when the sim is set to Kgs will result in a massively overweight acft.

[btacon 1,806]

1 hour ago, w6kd said:

Flaps?

"Airspeed remains N1+"...say what?  N1 is a power indication (compressor fan speed), not an airspeed.

Make sure you entered load (fuel and payload) in the same units FMC is set to...using lbs when the sim is set to Kgs will result in a massively overweight acft.

Flaps at 10

What I was implying was power / thrust but said airspeed

Overweight might be a contributor.  I will investigate

Thanks

[btacon 1,806]

On 9/19/2020 at 8:35 PM, w6kd said:

Make sure you entered load (fuel and payload) in the same units FMC is set to...using lbs when the sim is set to Kgs will result in a massively overweight acft.

Doh!  Fuel and payload completely overlooked by me in the EFB. I am convinced based upon what I saw (fuel tanks at zero) I was running out of fuel 30 seconds after departure. 
This morning I did a fuel and payload in the EFB and Bingo...departure with no issues. 

Thanks very much for the tip. I think that was it. 
 

Best,

-Braun