Today's Message Index:
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1. 04:55 AM - Re: Fuel filters (Thom Riddle)
2. 02:09 PM - Re: Re: Fuel filters (FLYaDIVE)
Message 1
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| Subject: | Re: Fuel filters |
Barry,
43.13 concerns maintenance, repair and inspection of type certificated aircraft.
The FAR that covers fuel flow requirements for type certificated aircraft is 23.955,
excerpts of which follows:
23.955 Fuel flow.
(b) Gravity systems. The fuel flow rate for gravity systems (main and reserve supply)
must be 150 percent of the takeoff fuel consumption of the engine.
Notice that the gravity feed system flow requirement is only 50% greater than max
fuel flow demand at take-off power.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Truth is what stands the test of experience.
- Albert Einstein
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=371583#371583
Message 2
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| Subject: | Re: Fuel filters |
Tom:
AC43.13 a/b are " Acceptable Methods, Techniques, and Practices - Aircraft
Inspection and Repair". It does go one step further in that it says AC
Large... As in Aircraft Large. BUT, as any builder will attest to - Try to
get a experimental aircraft approved by a DAR (at least any DAR worth his
weight in dirt) without referencing AC 43.13. But, I took your lead and
searched and searched for the number '8' times I mentioned but could not
find it. I remember that number from a Build Clinic I went to at Sun'nFun.
I did go to the FAR 23.955. It does state 150% of Full Power (Take Off)
fuel flow for a gravity feed system. But, maybe the difference comes from
the statement that it is 8 times the 'Cruse' fuel flow. I can see where
that would create a area of great question. Example: If we both have the
same engine and I cruse at 85% power and you cruse at 55% power - 8 times
55% is a lot less than 8 times 85%. So the fuel flow rates would be
different... Maybe that is where 8 comes in??? I will commit that 150% at
Full Throttle to memory. BUT! Remember that is MINIMUM NUMBER for
acceptance. And here is another area where the FAA messed up... They did
not state at What Density Altitude.
Fuel consumption at Colorado Springs, Co (~5280 Ft) would be a lot less
that at Ocean City, NJ (~10 Ft). So if you were to install a small
diameter fuel line and be happy at 150% flow in Colorado you could be
running Lean at New Jersey.
Maybe that is also where the speaker at Sun'n Fun came up with the number 8
from.
Barry
Experience is what you get from failures.
- Barry
On Mon, Apr 23, 2012 at 7:55 AM, Thom Riddle <riddletr@gmail.com> wrote:
m
> >
>
> Barry,
>
> 43.13 concerns maintenance, repair and inspection of type certificated
> aircraft.
>
> The FAR that covers fuel flow requirements for type certificated aircraft
> is 23.955, excerpts of which follows:
>
> =A7 23.955 Fuel flow.
> (b) Gravity systems. The fuel flow rate for gravity systems (main and
> reserve supply) must be 150 percent of the takeoff fuel consumption of th
e
> engine.
>
> Notice that the gravity feed system flow requirement is only 50% greater
> than max fuel flow demand at take-off power.
>
> --------
> Thom Riddle
> Buffalo, NY (9G0)
> Kolb Slingshot SS-021
> Jabiru 2200A #1574
> Tennessee Prop 64x32
>
> Truth is what stands the test of experience.
> - Albert Einstein
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=371583#371583
>
>
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