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Wink207

Hawker With GTN Fuel Flow Rate Readings

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Hi all:

Has anyone found a fix for the fuel flow readout in the engine gauge cluster above the GTN? Mine is way off. It seems to be steady around 400 lb/hr per engine and we know the actual burn rate is something like twice that. any ideas?

Thanks

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The actual fuel flow rate used to be in the FMC somewhere. (Now gone with Bert's mod)

 

Best workaround I've found is to set cruise power by fuel flow using the GTN's Fuel planning page.

 

1 Gallon of Jet A = 6.79 lbs   (or...Volume in Gallons = approx. 15% of fuel weight i.e.   2000 lbs / hr = ~300 Gal / hr)

 

Happy trails.

 

DB

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Ah, its good to know I'm not the only one with this issue (though mine is at a steady 411 lbs/hr). I only fly it with Bert's GTN mod but I suppose now I'll have to make a few trips with the native instruments to see what the fuel flow should be.

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Let me know if the native instruments give you a different reading.

 

This is what is being reported next to FF:

 

(A:TURB ENG CORRECTED FF:1, pph)
(A:TURB ENG CORRECTED FF:2, pph)
 

I have not knowingly changed that readout, but could fix it if I know what to aim for..

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OK, I have tried a couple of things.. if you feel adventurous, find the

CARPROLINE21 folder in your panel.gtn folder.

 

Open the MFD_GTN_Engine_Instruments.xml file with Notepad

and make the following edits:

 

 <Macro id="Engine Fuel Flow PPH 1" Name="FFLowPPH1">
 //     <MacroValue>(A:TURB ENG CORRECTED FF:1, pph)</MacroValue>
        <MacroValue>(A:TURB ENG FUEL FLOW PPH:1, pph)</MacroValue>
       </Macro>
      <Macro id="Engine Fuel Flow PPH 2" Name="FFLowPPH2">
//      <MacroValue>(A:TURB ENG CORRECTED FF:2, pph)</MacroValue>
        <MacroValue>(A:TURB ENG FUEL FLOW PPH:2, pph)</MacroValue>
      </Macro>

 

Save the file and see if you like it better.

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Better:

 

<Macro id="Engine Fuel Flow PPH 1" Name="FFLowPPH1">
        <MacroValue>(A:TURB ENG FUEL FLOW PPH:1, pph)</MacroValue>
       </Macro>
      <Macro id="Engine Fuel Flow PPH 2" Name="FFLowPPH2">
        <MacroValue>(A:TURB ENG FUEL FLOW PPH:2, pph)</MacroValue>
      </Macro>

 

IF you feel this still shows low, you can adjust the value...

 

something like:

 

<MacroValue>(A:TURB ENG FUEL FLOW PPH:1, pph) 1.5 * </MacroValue>

 

multiply by 1.5 (choose your favorite value..)

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Hi Bert,

I'm sorry to be a bit late responding to this but I've been having loads a' fun with AH2.

My idle FF with your GTN is about 48, whereas the native rate is about 388. On a climb at 10000 ft ias set at 211 the FF was 250 ish whereas in the native it's more like 1900.

That's a whopping factor to be out by so I suspect something else may be influencing it. The thought occurs that not enough space may be available in the display GTN version to show all the figures, ie. space for the last 3 digits instead of all 4 ?

I'll not mess with applying a factor just yet in case it's something more simple.

Peter

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OK, one more to try:

</Macro>
      <Macro id="Engine Fuel Flow PPH 1" Name="FFLowPPH1">
        <MacroValue>(A:ENG1 FUEL FLOW PPH, pound per hour)</MacroValue>
      </Macro>
      <Macro id="Engine Fuel Flow PPH 2" Name="FFLowPPH2">
        <MacroValue>(A:ENG2 FUEL FLOW PPH, pound per hour)</MacroValue>
      </Macro>

 

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Hi Maestro aka Bert,

Yup, that last tweak has rectified the display perfectly. I'm now getting exactly the same FF readings as the native plane.

Well done again, what would we do without you !

Respectfully yours

Peter

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