Crossfeeding with fuel pumps on?

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CFIDave
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Re: Crossfeeding with fuel pumps on?

Post by CFIDave »

FlyingPenguin wrote: Sun May 21, 2023 10:26 pm See AFM warming. Hope that makes sense.

So, this is for the DA42. DA62 fuel system is setup slightly different. It has a Bypass valve in the fuel line next to the low pressure pump, maybe that’s why the DA62 is different?
This warning also doesn't apply to the DA42-VI model. (I learned this when I owned a 2013 DA42-VI.)
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FlyingPenguin
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Re: Crossfeeding with fuel pumps on?

Post by FlyingPenguin »

CFIDave wrote: Sun May 21, 2023 11:11 pm
FlyingPenguin wrote: Sun May 21, 2023 10:26 pm See AFM warming. Hope that makes sense.

So, this is for the DA42. DA62 fuel system is setup slightly different. It has a Bypass valve in the fuel line next to the low pressure pump, maybe that’s why the DA62 is different?
This warning also doesn't apply to the DA42-VI model. (I learned this when I owned a 2013 DA42-VI.)
Perhaps things have changed through time, as this warning applies to my 2023 DA42-VI.
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CFIDave
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Re: Crossfeeding with fuel pumps on?

Post by CFIDave »

FlyingPenguin wrote: Sun May 21, 2023 11:59 pm
CFIDave wrote: Sun May 21, 2023 11:11 pm
FlyingPenguin wrote: Sun May 21, 2023 10:26 pm See AFM warming. Hope that makes sense.

So, this is for the DA42. DA62 fuel system is setup slightly different. It has a Bypass valve in the fuel line next to the low pressure pump, maybe that’s why the DA62 is different?
This warning also doesn't apply to the DA42-VI model. (I learned this when I owned a 2013 DA42-VI.)
Perhaps things have changed through time, as this warning applies to my 2023 DA42-VI.
No -- The warning does not apply to any DA42-VI, from 2012 on, including yours. Make sure you're referring to the 7.01.16E version of the DA42NG AFM that's specific to the "dash six" version of the DA42:
http://support.diamond-air.at/fileadmin ... mplete.pdf

and not to the 7.01.15E AFM version (quoted earlier in this DAN thread) that applies only to the 2009-2012 DA42NG. The 7.01.15E AFM does not apply to your "dash six."
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Re: Crossfeeding with fuel pumps on?

Post by FlyingPenguin »

CFIDave wrote: Mon May 22, 2023 1:02 pm
FlyingPenguin wrote: Sun May 21, 2023 11:59 pm
CFIDave wrote: Sun May 21, 2023 11:11 pm This warning also doesn't apply to the DA42-VI model. (I learned this when I owned a 2013 DA42-VI.)
Perhaps things have changed through time, as this warning applies to my 2023 DA42-VI.
No -- The warning does not apply to any DA42-VI, from 2012 on, including yours. Make sure you're referring to the 7.01.16E version of the DA42NG AFM that's specific to the "dash six" version of the DA42:
http://support.diamond-air.at/fileadmin ... mplete.pdf

and not to the 7.01.15E AFM version (quoted earlier in this DAN thread) that applies only to the 2009-2012 DA42NG. The 7.01.15E AFM does not apply to your "dash six."
Ops, you are absolutely right! I was wrong here.

Looking at the 7.01.16E, it has the bypass valve just like the DA62. Since there is a difference between the models, the checklist that I posted that came with my plane is incorrect than. It’s shows pump off, than crossfeed.

Thank you Dave for this info! :D
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Re: Crossfeeding with fuel pumps on?

Post by neema »

Dave and Peter, thanks for the info.

The word bypass is only mentioned once in any fuel system description in the 42-VI AFM (section 7.9.5). Guessing that's the bypass valve Dave was talking about (no other mention in the AFM)
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Re: Crossfeeding with fuel pumps on?

Post by Boatguy »

The DA62 AFM abnormal checklist for low fuel expressly says to turn the fuel pump ON before crossfeeding.
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mfdutra
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Re: Crossfeeding with fuel pumps on?

Post by mfdutra »

Boatguy wrote: Thu May 25, 2023 4:50 pm The DA62 AFM abnormal checklist for low fuel expressly says to turn the fuel pump ON before crossfeeding.
Only if it's above 10,000 feet.
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Re: Crossfeeding with fuel pumps on?

Post by Boatguy »

mfdutra wrote: Thu May 25, 2023 10:26 pm
Boatguy wrote: Thu May 25, 2023 4:50 pm The DA62 AFM abnormal checklist for low fuel expressly says to turn the fuel pump ON before crossfeeding.
Only if it's above 10,000 feet.
Which implies no fuel pump below 10,000’.
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