CRZ Performance and fuel Forecast

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metzgergva
Posts: 91
Joined: Wed Jun 28, 2017 8:09 pm
CRZ Performance and fuel Forecast

Post by metzgergva » Mon Jan 13, 2020 5:44 pm

I did a longer flight over 650 nm 2FL310. This is what I had on the MFD:
Screen_19.jpg
Screen_19.jpg (57.45 KiB) Viewed 839 times
GS 362 and TAS 314 nice tail wind.
Acc. Loadsheet I had ZFW 11100 lbs and had loaded 2000 lbs of fuel for the 650 nm flight
Doing a check at that position showing only 18 lb as arrival airport I did a check.
Remaining flight time 470 nm/262 kts = 1.3 hrs = 1h:20min. Time calculation is correct!
Fuel on board 1340 lbs. 1.3 hrs x 740 lb/hr = 960 fuel to Dest, remaining 380 lb - a bit borderline but still okay.
So the fuel at destination calculation is not matching, though I entered it in the PERF INI correctly at DEP.

The other thing that puzzled me is the following (edited with tank volume changes versus what AFSD showed):
While the MFD says a FF of 2x 370 lbs/hr, the actual measured FF over 10 min flight and extrapolated is only 780 total lbs/hr. That is 5% off between actual consumption and FF showing on MFD.
The internal AFSD measurements seem to be irrelevant as the FF and real consumption is tuned individually.

Comments?

KenG
Posts: 157
Joined: Sat May 09, 2015 2:33 am
Re: CRZ Performance and fuel Forecast

Post by KenG » Tue Jan 14, 2020 12:44 pm

Was an approach loaded?

I have seen this bug before and I thought they had it fixed.

Taguilo
Posts: 658
Joined: Sun May 11, 2014 11:49 am
Re: CRZ Performance and fuel Forecast

Post by Taguilo » Tue Jan 14, 2020 3:35 pm

Hi,

We will check FF data in PROG and PERF pages.

Thanks!

Tomas

lequinne
Posts: 9
Joined: Wed Dec 12, 2018 12:10 am
Re: CRZ Performance and fuel Forecast

Post by lequinne » Tue Jan 21, 2020 5:13 pm

Fuel forecast is being reworked for the next update


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